2023/11/15 - Auto Scaling - 5 updated api methods
Changes This release introduces Instance Maintenance Policy, a new EC2 Auto Scaling capability that allows customers to define whether instances are launched before or after existing instances are terminated during instance replacement operations.
{'InstanceMaintenancePolicy': {'MaxHealthyPercentage': 'integer',
'MinHealthyPercentage': 'integer'}}
We strongly recommend using a launch template when calling this operation to ensure full functionality for Amazon EC2 Auto Scaling and Amazon EC2.
Creates an Auto Scaling group with the specified name and attributes.
If you exceed your maximum limit of Auto Scaling groups, the call fails. To query this limit, call the DescribeAccountLimits API. For information about updating this limit, see Quotas for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide .
For introductory exercises for creating an Auto Scaling group, see Getting started with Amazon EC2 Auto Scaling and Tutorial: Set up a scaled and load-balanced application in the Amazon EC2 Auto Scaling User Guide . For more information, see Auto Scaling groups in the Amazon EC2 Auto Scaling User Guide .
Every Auto Scaling group has three size properties ( DesiredCapacity , MaxSize , and MinSize ). Usually, you set these sizes based on a specific number of instances. However, if you configure a mixed instances policy that defines weights for the instance types, you must specify these sizes with the same units that you use for weighting instances.
See also: AWS API Documentation
Request Syntax
client.create_auto_scaling_group(
AutoScalingGroupName='string',
LaunchConfigurationName='string',
LaunchTemplate={
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
MixedInstancesPolicy={
'LaunchTemplate': {
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'Overrides': [
{
'InstanceType': 'string',
'WeightedCapacity': 'string',
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'InstanceRequirements': {
'VCpuCount': {
'Min': 123,
'Max': 123
},
'MemoryMiB': {
'Min': 123,
'Max': 123
},
'CpuManufacturers': [
'intel'|'amd'|'amazon-web-services',
],
'MemoryGiBPerVCpu': {
'Min': 123.0,
'Max': 123.0
},
'ExcludedInstanceTypes': [
'string',
],
'InstanceGenerations': [
'current'|'previous',
],
'SpotMaxPricePercentageOverLowestPrice': 123,
'OnDemandMaxPricePercentageOverLowestPrice': 123,
'BareMetal': 'included'|'excluded'|'required',
'BurstablePerformance': 'included'|'excluded'|'required',
'RequireHibernateSupport': True|False,
'NetworkInterfaceCount': {
'Min': 123,
'Max': 123
},
'LocalStorage': 'included'|'excluded'|'required',
'LocalStorageTypes': [
'hdd'|'ssd',
],
'TotalLocalStorageGB': {
'Min': 123.0,
'Max': 123.0
},
'BaselineEbsBandwidthMbps': {
'Min': 123,
'Max': 123
},
'AcceleratorTypes': [
'gpu'|'fpga'|'inference',
],
'AcceleratorCount': {
'Min': 123,
'Max': 123
},
'AcceleratorManufacturers': [
'nvidia'|'amd'|'amazon-web-services'|'xilinx',
],
'AcceleratorNames': [
'a100'|'v100'|'k80'|'t4'|'m60'|'radeon-pro-v520'|'vu9p',
],
'AcceleratorTotalMemoryMiB': {
'Min': 123,
'Max': 123
},
'NetworkBandwidthGbps': {
'Min': 123.0,
'Max': 123.0
},
'AllowedInstanceTypes': [
'string',
]
}
},
]
},
'InstancesDistribution': {
'OnDemandAllocationStrategy': 'string',
'OnDemandBaseCapacity': 123,
'OnDemandPercentageAboveBaseCapacity': 123,
'SpotAllocationStrategy': 'string',
'SpotInstancePools': 123,
'SpotMaxPrice': 'string'
}
},
InstanceId='string',
MinSize=123,
MaxSize=123,
DesiredCapacity=123,
DefaultCooldown=123,
AvailabilityZones=[
'string',
],
LoadBalancerNames=[
'string',
],
TargetGroupARNs=[
'string',
],
HealthCheckType='string',
HealthCheckGracePeriod=123,
PlacementGroup='string',
VPCZoneIdentifier='string',
TerminationPolicies=[
'string',
],
NewInstancesProtectedFromScaleIn=True|False,
CapacityRebalance=True|False,
LifecycleHookSpecificationList=[
{
'LifecycleHookName': 'string',
'LifecycleTransition': 'string',
'NotificationMetadata': 'string',
'HeartbeatTimeout': 123,
'DefaultResult': 'string',
'NotificationTargetARN': 'string',
'RoleARN': 'string'
},
],
Tags=[
{
'ResourceId': 'string',
'ResourceType': 'string',
'Key': 'string',
'Value': 'string',
'PropagateAtLaunch': True|False
},
],
ServiceLinkedRoleARN='string',
MaxInstanceLifetime=123,
Context='string',
DesiredCapacityType='string',
DefaultInstanceWarmup=123,
TrafficSources=[
{
'Identifier': 'string',
'Type': 'string'
},
],
InstanceMaintenancePolicy={
'MinHealthyPercentage': 123,
'MaxHealthyPercentage': 123
}
)
string
[REQUIRED]
The name of the Auto Scaling group. This name must be unique per Region per account.
The name can contain any ASCII character 33 to 126 including most punctuation characters, digits, and upper and lowercased letters.
Note
You cannot use a colon (:) in the name.
string
The name of the launch configuration to use to launch instances.
Conditional: You must specify either a launch template ( LaunchTemplate or MixedInstancesPolicy ) or a launch configuration ( LaunchConfigurationName or InstanceId ).
dict
Information used to specify the launch template and version to use to launch instances.
Conditional: You must specify either a launch template ( LaunchTemplate or MixedInstancesPolicy ) or a launch configuration ( LaunchConfigurationName or InstanceId ).
Note
The launch template that is specified must be configured for use with an Auto Scaling group. For more information, see Creating a launch template for an Auto Scaling group in the Amazon EC2 Auto Scaling User Guide .
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
dict
The mixed instances policy. For more information, see Auto Scaling groups with multiple instance types and purchase options in the Amazon EC2 Auto Scaling User Guide .
LaunchTemplate (dict) --
One or more launch templates and the instance types (overrides) that are used to launch EC2 instances to fulfill On-Demand and Spot capacities.
LaunchTemplateSpecification (dict) --
The launch template.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
Overrides (list) --
Any properties that you specify override the same properties in the launch template.
(dict) --
Use this structure to let Amazon EC2 Auto Scaling do the following when the Auto Scaling group has a mixed instances policy:
Override the instance type that is specified in the launch template.
Use multiple instance types.
Specify the instance types that you want, or define your instance requirements instead and let Amazon EC2 Auto Scaling provision the available instance types that meet your requirements. This can provide Amazon EC2 Auto Scaling with a larger selection of instance types to choose from when fulfilling Spot and On-Demand capacities. You can view which instance types are matched before you apply the instance requirements to your Auto Scaling group.
After you define your instance requirements, you don't have to keep updating these settings to get new EC2 instance types automatically. Amazon EC2 Auto Scaling uses the instance requirements of the Auto Scaling group to determine whether a new EC2 instance type can be used.
InstanceType (string) --
The instance type, such as m3.xlarge . You must specify an instance type that is supported in your requested Region and Availability Zones. For more information, see Instance types in the Amazon Elastic Compute Cloud User Guide .
You can specify up to 40 instance types per Auto Scaling group.
WeightedCapacity (string) --
If you provide a list of instance types to use, you can specify the number of capacity units provided by each instance type in terms of virtual CPUs, memory, storage, throughput, or other relative performance characteristic. When a Spot or On-Demand Instance is launched, the capacity units count toward the desired capacity. Amazon EC2 Auto Scaling launches instances until the desired capacity is totally fulfilled, even if this results in an overage. For example, if there are two units remaining to fulfill capacity, and Amazon EC2 Auto Scaling can only launch an instance with a WeightedCapacity of five units, the instance is launched, and the desired capacity is exceeded by three units. For more information, see Configuring instance weighting for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide . Value must be in the range of 1–999.
If you specify a value for WeightedCapacity for one instance type, you must specify a value for WeightedCapacity for all of them.
Warning
Every Auto Scaling group has three size parameters ( DesiredCapacity , MaxSize , and MinSize ). Usually, you set these sizes based on a specific number of instances. However, if you configure a mixed instances policy that defines weights for the instance types, you must specify these sizes with the same units that you use for weighting instances.
LaunchTemplateSpecification (dict) --
Provides a launch template for the specified instance type or set of instance requirements. For example, some instance types might require a launch template with a different AMI. If not provided, Amazon EC2 Auto Scaling uses the launch template that's specified in the LaunchTemplate definition. For more information, see Specifying a different launch template for an instance type in the Amazon EC2 Auto Scaling User Guide .
You can specify up to 20 launch templates per Auto Scaling group. The launch templates specified in the overrides and in the LaunchTemplate definition count towards this limit.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
InstanceRequirements (dict) --
The instance requirements. Amazon EC2 Auto Scaling uses your specified requirements to identify instance types. Then, it uses your On-Demand and Spot allocation strategies to launch instances from these instance types.
You can specify up to four separate sets of instance requirements per Auto Scaling group. This is useful for provisioning instances from different Amazon Machine Images (AMIs) in the same Auto Scaling group. To do this, create the AMIs and create a new launch template for each AMI. Then, create a compatible set of instance requirements for each launch template.
Note
If you specify InstanceRequirements , you can't specify InstanceType .
VCpuCount (dict) -- [REQUIRED]
The minimum and maximum number of vCPUs for an instance type.
Min (integer) -- [REQUIRED]
The minimum number of vCPUs.
Max (integer) --
The maximum number of vCPUs.
MemoryMiB (dict) -- [REQUIRED]
The minimum and maximum instance memory size for an instance type, in MiB.
Min (integer) -- [REQUIRED]
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
CpuManufacturers (list) --
Lists which specific CPU manufacturers to include.
For instance types with Intel CPUs, specify intel .
For instance types with AMD CPUs, specify amd .
For instance types with Amazon Web Services CPUs, specify amazon-web-services .
Note
Don't confuse the CPU hardware manufacturer with the CPU hardware architecture. Instances will be launched with a compatible CPU architecture based on the Amazon Machine Image (AMI) that you specify in your launch template.
Default: Any manufacturer
(string) --
MemoryGiBPerVCpu (dict) --
The minimum and maximum amount of memory per vCPU for an instance type, in GiB.
Default: No minimum or maximum limits
Min (float) --
The memory minimum in GiB.
Max (float) --
The memory maximum in GiB.
ExcludedInstanceTypes (list) --
The instance types to exclude. You can use strings with one or more wild cards, represented by an asterisk ( * ), to exclude an instance family, type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , you are excluding the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will exclude all the M5a instance types, but not the M5n instance types.
Note
If you specify ExcludedInstanceTypes , you can't specify AllowedInstanceTypes .
Default: No excluded instance types
(string) --
InstanceGenerations (list) --
Indicates whether current or previous generation instance types are included.
For current generation instance types, specify current . The current generation includes EC2 instance types currently recommended for use. This typically includes the latest two to three generations in each instance family. For more information, see Instance types in the Amazon EC2 User Guide for Linux Instances .
For previous generation instance types, specify previous .
Default: Any current or previous generation
(string) --
SpotMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for Spot Instances. This is the maximum you’ll pay for a Spot Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 100
OnDemandMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for On-Demand Instances. This is the maximum you’ll pay for an On-Demand Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 20
BareMetal (string) --
Indicates whether bare metal instance types are included, excluded, or required.
Default: excluded
BurstablePerformance (string) --
Indicates whether burstable performance instance types are included, excluded, or required. For more information, see Burstable performance instances in the Amazon EC2 User Guide for Linux Instances .
Default: excluded
RequireHibernateSupport (boolean) --
Indicates whether instance types must provide On-Demand Instance hibernation support.
Default: false
NetworkInterfaceCount (dict) --
The minimum and maximum number of network interfaces for an instance type.
Default: No minimum or maximum limits
Min (integer) --
The minimum number of network interfaces.
Max (integer) --
The maximum number of network interfaces.
LocalStorage (string) --
Indicates whether instance types with instance store volumes are included, excluded, or required. For more information, see Amazon EC2 instance store in the Amazon EC2 User Guide for Linux Instances .
Default: included
LocalStorageTypes (list) --
Indicates the type of local storage that is required.
For instance types with hard disk drive (HDD) storage, specify hdd .
For instance types with solid state drive (SSD) storage, specify ssd .
Default: Any local storage type
(string) --
TotalLocalStorageGB (dict) --
The minimum and maximum total local storage size for an instance type, in GB.
Default: No minimum or maximum limits
Min (float) --
The storage minimum in GB.
Max (float) --
The storage maximum in GB.
BaselineEbsBandwidthMbps (dict) --
The minimum and maximum baseline bandwidth performance for an instance type, in Mbps. For more information, see Amazon EBS–optimized instances in the Amazon EC2 User Guide for Linux Instances .
Default: No minimum or maximum limits
Min (integer) --
The minimum value in Mbps.
Max (integer) --
The maximum value in Mbps.
AcceleratorTypes (list) --
Lists the accelerator types that must be on an instance type.
For instance types with GPU accelerators, specify gpu .
For instance types with FPGA accelerators, specify fpga .
For instance types with inference accelerators, specify inference .
Default: Any accelerator type
(string) --
AcceleratorCount (dict) --
The minimum and maximum number of accelerators (GPUs, FPGAs, or Amazon Web Services Inferentia chips) for an instance type.
To exclude accelerator-enabled instance types, set Max to 0 .
Default: No minimum or maximum limits
Min (integer) --
The minimum value.
Max (integer) --
The maximum value.
AcceleratorManufacturers (list) --
Indicates whether instance types must have accelerators by specific manufacturers.
For instance types with NVIDIA devices, specify nvidia .
For instance types with AMD devices, specify amd .
For instance types with Amazon Web Services devices, specify amazon-web-services .
For instance types with Xilinx devices, specify xilinx .
Default: Any manufacturer
(string) --
AcceleratorNames (list) --
Lists the accelerators that must be on an instance type.
For instance types with NVIDIA A100 GPUs, specify a100 .
For instance types with NVIDIA V100 GPUs, specify v100 .
For instance types with NVIDIA K80 GPUs, specify k80 .
For instance types with NVIDIA T4 GPUs, specify t4 .
For instance types with NVIDIA M60 GPUs, specify m60 .
For instance types with AMD Radeon Pro V520 GPUs, specify radeon-pro-v520 .
For instance types with Xilinx VU9P FPGAs, specify vu9p .
Default: Any accelerator
(string) --
AcceleratorTotalMemoryMiB (dict) --
The minimum and maximum total memory size for the accelerators on an instance type, in MiB.
Default: No minimum or maximum limits
Min (integer) --
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
NetworkBandwidthGbps (dict) --
The minimum and maximum amount of network bandwidth, in gigabits per second (Gbps).
Default: No minimum or maximum limits
Min (float) --
The minimum amount of network bandwidth, in gigabits per second (Gbps).
Max (float) --
The maximum amount of network bandwidth, in gigabits per second (Gbps).
AllowedInstanceTypes (list) --
The instance types to apply your specified attributes against. All other instance types are ignored, even if they match your specified attributes.
You can use strings with one or more wild cards, represented by an asterisk ( * ), to allow an instance type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , Amazon EC2 Auto Scaling will allow the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will allow all the M5a instance types, but not the M5n instance types.
Note
If you specify AllowedInstanceTypes , you can't specify ExcludedInstanceTypes .
Default: All instance types
(string) --
InstancesDistribution (dict) --
The instances distribution.
OnDemandAllocationStrategy (string) --
The allocation strategy to apply to your On-Demand Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
lowest-price
Uses price to determine which instance types are the highest priority, launching the lowest priced instance types within an Availability Zone first. This is the default value for Auto Scaling groups that specify InstanceRequirements.
prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling launches your highest priority instance types first. If all your On-Demand capacity cannot be fulfilled using your highest priority instance type, then Amazon EC2 Auto Scaling launches the remaining capacity using the second priority instance type, and so on. This is the default value for Auto Scaling groups that don't specify InstanceRequirements and cannot be used for groups that do.
OnDemandBaseCapacity (integer) --
The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances. This base portion is launched first as your group scales.
This number has the same unit of measurement as the group's desired capacity. If you change the default unit of measurement (number of instances) by specifying weighted capacity values in your launch template overrides list, or by changing the default desired capacity type setting of the group, you must specify this number using the same unit of measurement.
Default: 0
OnDemandPercentageAboveBaseCapacity (integer) --
Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity . Expressed as a number (for example, 20 specifies 20% On-Demand Instances, 80% Spot Instances). If set to 100, only On-Demand Instances are used.
Default: 100
SpotAllocationStrategy (string) --
The allocation strategy to apply to your Spot Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
capacity-optimized
Requests Spot Instances using pools that are optimally chosen based on the available Spot capacity. This strategy has the lowest risk of interruption. To give certain instance types a higher chance of launching first, use capacity-optimized-prioritized .
capacity-optimized-prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling honors the instance type priorities on a best effort basis but optimizes for capacity first. Note that if the On-Demand allocation strategy is set to prioritized , the same priority is applied when fulfilling On-Demand capacity. This is not a valid value for Auto Scaling groups that specify InstanceRequirements.
lowest-price
Requests Spot Instances using the lowest priced pools within an Availability Zone, across the number of Spot pools that you specify for the SpotInstancePools property. To ensure that your desired capacity is met, you might receive Spot Instances from several pools. This is the default value, but it might lead to high interruption rates because this strategy only considers instance price and not available capacity.
price-capacity-optimized (recommended)
The price and capacity optimized allocation strategy looks at both price and capacity to select the Spot Instance pools that are the least likely to be interrupted and have the lowest possible price.
SpotInstancePools (integer) --
The number of Spot Instance pools across which to allocate your Spot Instances. The Spot pools are determined from the different instance types in the overrides. Valid only when the SpotAllocationStrategy is lowest-price . Value must be in the range of 1–20.
Default: 2
SpotMaxPrice (string) --
The maximum price per unit hour that you are willing to pay for a Spot Instance. If your maximum price is lower than the Spot price for the instance types that you selected, your Spot Instances are not launched. We do not recommend specifying a maximum price because it can lead to increased interruptions. When Spot Instances launch, you pay the current Spot price. To remove a maximum price that you previously set, include the property but specify an empty string ("") for the value.
Warning
If you specify a maximum price, your instances will be interrupted more frequently than if you do not specify one.
Valid Range: Minimum value of 0.001
string
The ID of the instance used to base the launch configuration on. If specified, Amazon EC2 Auto Scaling uses the configuration values from the specified instance to create a new launch configuration. To get the instance ID, use the Amazon EC2 DescribeInstances API operation. For more information, see Creating an Auto Scaling group using an EC2 instance in the Amazon EC2 Auto Scaling User Guide .
integer
[REQUIRED]
The minimum size of the group.
integer
[REQUIRED]
The maximum size of the group.
Note
With a mixed instances policy that uses instance weighting, Amazon EC2 Auto Scaling may need to go above MaxSize to meet your capacity requirements. In this event, Amazon EC2 Auto Scaling will never go above MaxSize by more than your largest instance weight (weights that define how many units each instance contributes to the desired capacity of the group).
integer
The desired capacity is the initial capacity of the Auto Scaling group at the time of its creation and the capacity it attempts to maintain. It can scale beyond this capacity if you configure auto scaling. This number must be greater than or equal to the minimum size of the group and less than or equal to the maximum size of the group. If you do not specify a desired capacity, the default is the minimum size of the group.
integer
Only needed if you use simple scaling policies.
The amount of time, in seconds, between one scaling activity ending and another one starting due to simple scaling policies. For more information, see Scaling cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide .
Default: 300 seconds
list
A list of Availability Zones where instances in the Auto Scaling group can be created. Used for launching into the default VPC subnet in each Availability Zone when not using the VPCZoneIdentifier property, or for attaching a network interface when an existing network interface ID is specified in a launch template.
(string) --
list
A list of Classic Load Balancers associated with this Auto Scaling group. For Application Load Balancers, Network Load Balancers, and Gateway Load Balancers, specify the TargetGroupARNs property instead.
(string) --
list
The Amazon Resource Names (ARN) of the Elastic Load Balancing target groups to associate with the Auto Scaling group. Instances are registered as targets with the target groups. The target groups receive incoming traffic and route requests to one or more registered targets. For more information, see Use Elastic Load Balancing to distribute traffic across the instances in your Auto Scaling group in the Amazon EC2 Auto Scaling User Guide .
(string) --
string
A comma-separated value string of one or more health check types.
The valid values are EC2 , ELB , and VPC_LATTICE . EC2 is the default health check and cannot be disabled. For more information, see Health checks for Auto Scaling instances in the Amazon EC2 Auto Scaling User Guide .
Only specify EC2 if you must clear a value that was previously set.
integer
The amount of time, in seconds, that Amazon EC2 Auto Scaling waits before checking the health status of an EC2 instance that has come into service and marking it unhealthy due to a failed health check. This is useful if your instances do not immediately pass their health checks after they enter the InService state. For more information, see Set the health check grace period for an Auto Scaling group in the Amazon EC2 Auto Scaling User Guide .
Default: 0 seconds
string
The name of the placement group into which to launch your instances. For more information, see Placement groups in the Amazon EC2 User Guide for Linux Instances .
Note
A cluster placement group is a logical grouping of instances within a single Availability Zone. You cannot specify multiple Availability Zones and a cluster placement group.
string
A comma-separated list of subnet IDs for a virtual private cloud (VPC) where instances in the Auto Scaling group can be created. If you specify VPCZoneIdentifier with AvailabilityZones , the subnets that you specify must reside in those Availability Zones.
list
A policy or a list of policies that are used to select the instance to terminate. These policies are executed in the order that you list them. For more information, see Work with Amazon EC2 Auto Scaling termination policies in the Amazon EC2 Auto Scaling User Guide .
Valid values: Default | AllocationStrategy | ClosestToNextInstanceHour | NewestInstance | OldestInstance | OldestLaunchConfiguration | OldestLaunchTemplate | arn:aws:lambda:region:account-id:function:my-function:my-alias
(string) --
boolean
Indicates whether newly launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in. For more information about preventing instances from terminating on scale in, see Using instance scale-in protection in the Amazon EC2 Auto Scaling User Guide .
boolean
Indicates whether Capacity Rebalancing is enabled. Otherwise, Capacity Rebalancing is disabled. When you turn on Capacity Rebalancing, Amazon EC2 Auto Scaling attempts to launch a Spot Instance whenever Amazon EC2 notifies that a Spot Instance is at an elevated risk of interruption. After launching a new instance, it then terminates an old instance. For more information, see Use Capacity Rebalancing to handle Amazon EC2 Spot Interruptions in the in the Amazon EC2 Auto Scaling User Guide .
list
One or more lifecycle hooks to add to the Auto Scaling group before instances are launched.
(dict) --
Describes information used to specify a lifecycle hook for an Auto Scaling group.
For more information, see Amazon EC2 Auto Scaling lifecycle hooks in the Amazon EC2 Auto Scaling User Guide .
LifecycleHookName (string) -- [REQUIRED]
The name of the lifecycle hook.
LifecycleTransition (string) -- [REQUIRED]
The lifecycle transition. For Auto Scaling groups, there are two major lifecycle transitions.
To create a lifecycle hook for scale-out events, specify autoscaling:EC2_INSTANCE_LAUNCHING .
To create a lifecycle hook for scale-in events, specify autoscaling:EC2_INSTANCE_TERMINATING .
NotificationMetadata (string) --
Additional information that you want to include any time Amazon EC2 Auto Scaling sends a message to the notification target.
HeartbeatTimeout (integer) --
The maximum time, in seconds, that can elapse before the lifecycle hook times out. The range is from 30 to 7200 seconds. The default value is 3600 seconds (1 hour).
DefaultResult (string) --
The action the Auto Scaling group takes when the lifecycle hook timeout elapses or if an unexpected failure occurs. The default value is ABANDON .
Valid values: CONTINUE | ABANDON
NotificationTargetARN (string) --
The Amazon Resource Name (ARN) of the notification target that Amazon EC2 Auto Scaling sends notifications to when an instance is in a wait state for the lifecycle hook. You can specify an Amazon SNS topic or an Amazon SQS queue.
RoleARN (string) --
The ARN of the IAM role that allows the Auto Scaling group to publish to the specified notification target. For information about creating this role, see Configure a notification target for a lifecycle hook in the Amazon EC2 Auto Scaling User Guide .
Valid only if the notification target is an Amazon SNS topic or an Amazon SQS queue.
list
One or more tags. You can tag your Auto Scaling group and propagate the tags to the Amazon EC2 instances it launches. Tags are not propagated to Amazon EBS volumes. To add tags to Amazon EBS volumes, specify the tags in a launch template but use caution. If the launch template specifies an instance tag with a key that is also specified for the Auto Scaling group, Amazon EC2 Auto Scaling overrides the value of that instance tag with the value specified by the Auto Scaling group. For more information, see Tag Auto Scaling groups and instances in the Amazon EC2 Auto Scaling User Guide .
(dict) --
Describes a tag for an Auto Scaling group.
ResourceId (string) --
The name of the Auto Scaling group.
ResourceType (string) --
The type of resource. The only supported value is auto-scaling-group .
Key (string) -- [REQUIRED]
The tag key.
Value (string) --
The tag value.
PropagateAtLaunch (boolean) --
Determines whether the tag is added to new instances as they are launched in the group.
string
The Amazon Resource Name (ARN) of the service-linked role that the Auto Scaling group uses to call other Amazon Web Services service on your behalf. By default, Amazon EC2 Auto Scaling uses a service-linked role named AWSServiceRoleForAutoScaling , which it creates if it does not exist. For more information, see Service-linked roles in the Amazon EC2 Auto Scaling User Guide .
integer
The maximum amount of time, in seconds, that an instance can be in service. The default is null. If specified, the value must be either 0 or a number equal to or greater than 86,400 seconds (1 day). For more information, see Replacing Auto Scaling instances based on maximum instance lifetime in the Amazon EC2 Auto Scaling User Guide .
string
Reserved.
string
The unit of measurement for the value specified for desired capacity. Amazon EC2 Auto Scaling supports DesiredCapacityType for attribute-based instance type selection only. For more information, see Creating an Auto Scaling group using attribute-based instance type selection in the Amazon EC2 Auto Scaling User Guide .
By default, Amazon EC2 Auto Scaling specifies units , which translates into number of instances.
Valid values: units | vcpu | memory-mib
integer
The amount of time, in seconds, until a new instance is considered to have finished initializing and resource consumption to become stable after it enters the InService state.
During an instance refresh, Amazon EC2 Auto Scaling waits for the warm-up period after it replaces an instance before it moves on to replacing the next instance. Amazon EC2 Auto Scaling also waits for the warm-up period before aggregating the metrics for new instances with existing instances in the Amazon CloudWatch metrics that are used for scaling, resulting in more reliable usage data. For more information, see Set the default instance warmup for an Auto Scaling group in the Amazon EC2 Auto Scaling User Guide .
Warning
To manage various warm-up settings at the group level, we recommend that you set the default instance warmup, even if it is set to 0 seconds . To remove a value that you previously set, include the property but specify -1 for the value. However, we strongly recommend keeping the default instance warmup enabled by specifying a value of 0 or other nominal value.
Default: None
list
The list of traffic sources to attach to this Auto Scaling group. You can use any of the following as traffic sources for an Auto Scaling group: Classic Load Balancer, Application Load Balancer, Gateway Load Balancer, Network Load Balancer, and VPC Lattice.
(dict) --
Identifying information for a traffic source.
Identifier (string) -- [REQUIRED]
Identifies the traffic source.
For Application Load Balancers, Gateway Load Balancers, Network Load Balancers, and VPC Lattice, this will be the Amazon Resource Name (ARN) for a target group in this account and Region. For Classic Load Balancers, this will be the name of the Classic Load Balancer in this account and Region.
For example:
Application Load Balancer ARN: arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/my-targets/1234567890123456
Classic Load Balancer name: my-classic-load-balancer
VPC Lattice ARN: arn:aws:vpc-lattice:us-west-2:123456789012:targetgroup/tg-1234567890123456
To get the ARN of a target group for a Application Load Balancer, Gateway Load Balancer, or Network Load Balancer, or the name of a Classic Load Balancer, use the Elastic Load Balancing DescribeTargetGroups and DescribeLoadBalancers API operations.
To get the ARN of a target group for VPC Lattice, use the VPC Lattice GetTargetGroup API operation.
Type (string) --
Provides additional context for the value of Identifier .
The following lists the valid values:
elb if Identifier is the name of a Classic Load Balancer.
elbv2 if Identifier is the ARN of an Application Load Balancer, Gateway Load Balancer, or Network Load Balancer target group.
vpc-lattice if Identifier is the ARN of a VPC Lattice target group.
Required if the identifier is the name of a Classic Load Balancer.
dict
An instance maintenance policy. For more information, see Set instance maintenance policy in the Amazon EC2 Auto Scaling User Guide .
MinHealthyPercentage (integer) --
Specifies the lower threshold as a percentage of the desired capacity of the Auto Scaling group. It represents the minimum percentage of the group to keep in service, healthy, and ready to use to support your workload when replacing instances. Value range is 0 to 100. After it's set, a value of -1 will clear the previously set value.
MaxHealthyPercentage (integer) --
Specifies the upper threshold as a percentage of the desired capacity of the Auto Scaling group. It represents the maximum percentage of the group that can be in service and healthy, or pending, to support your workload when replacing instances. Value range is 100 to 200. After it's set, a value of -1 will clear the previously set value.
Both MinHealthyPercentage and MaxHealthyPercentage must be specified, and the difference between them cannot be greater than 100. A large range increases the number of instances that can be replaced at the same time.
None
{'AutoScalingGroups': {'InstanceMaintenancePolicy': {'MaxHealthyPercentage': 'integer',
'MinHealthyPercentage': 'integer'}}}
Gets information about the Auto Scaling groups in the account and Region.
If you specify Auto Scaling group names, the output includes information for only the specified Auto Scaling groups. If you specify filters, the output includes information for only those Auto Scaling groups that meet the filter criteria. If you do not specify group names or filters, the output includes information for all Auto Scaling groups.
This operation also returns information about instances in Auto Scaling groups. To retrieve information about the instances in a warm pool, you must call the DescribeWarmPool API.
See also: AWS API Documentation
Request Syntax
client.describe_auto_scaling_groups(
AutoScalingGroupNames=[
'string',
],
NextToken='string',
MaxRecords=123,
Filters=[
{
'Name': 'string',
'Values': [
'string',
]
},
]
)
list
The names of the Auto Scaling groups. By default, you can only specify up to 50 names. You can optionally increase this limit using the MaxRecords property.
If you omit this property, all Auto Scaling groups are described.
(string) --
string
The token for the next set of items to return. (You received this token from a previous call.)
integer
The maximum number of items to return with this call. The default value is 50 and the maximum value is 100 .
list
One or more filters to limit the results based on specific tags.
(dict) --
Describes a filter that is used to return a more specific list of results from a describe operation.
If you specify multiple filters, the filters are automatically logically joined with an AND , and the request returns only the results that match all of the specified filters.
For more information, see Tag Auto Scaling groups and instances in the Amazon EC2 Auto Scaling User Guide .
Name (string) --
The name of the filter.
The valid values for Name depend on which API operation you're using with the filter ( DescribeAutoScalingGroups or DescribeTags ).
DescribeAutoScalingGroups
Valid values for Name include the following:
tag-key - Accepts tag keys. The results only include information about the Auto Scaling groups associated with these tag keys.
tag-value - Accepts tag values. The results only include information about the Auto Scaling groups associated with these tag values.
tag:<key> - Accepts the key/value combination of the tag. Use the tag key in the filter name and the tag value as the filter value. The results only include information about the Auto Scaling groups associated with the specified key/value combination.
DescribeTags
Valid values for Name include the following:
auto-scaling-group - Accepts the names of Auto Scaling groups. The results only include information about the tags associated with these Auto Scaling groups.
key - Accepts tag keys. The results only include information about the tags associated with these tag keys.
value - Accepts tag values. The results only include information about the tags associated with these tag values.
propagate-at-launch - Accepts a Boolean value, which specifies whether tags propagate to instances at launch. The results only include information about the tags associated with the specified Boolean value.
Values (list) --
One or more filter values. Filter values are case-sensitive.
If you specify multiple values for a filter, the values are automatically logically joined with an OR , and the request returns all results that match any of the specified values. For example, specify "tag:environment" for the filter name and "production,development" for the filter values to find Auto Scaling groups with the tag "environment=production" or "environment=development".
(string) --
dict
Response Syntax
{
'AutoScalingGroups': [
{
'AutoScalingGroupName': 'string',
'AutoScalingGroupARN': 'string',
'LaunchConfigurationName': 'string',
'LaunchTemplate': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'MixedInstancesPolicy': {
'LaunchTemplate': {
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'Overrides': [
{
'InstanceType': 'string',
'WeightedCapacity': 'string',
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'InstanceRequirements': {
'VCpuCount': {
'Min': 123,
'Max': 123
},
'MemoryMiB': {
'Min': 123,
'Max': 123
},
'CpuManufacturers': [
'intel'|'amd'|'amazon-web-services',
],
'MemoryGiBPerVCpu': {
'Min': 123.0,
'Max': 123.0
},
'ExcludedInstanceTypes': [
'string',
],
'InstanceGenerations': [
'current'|'previous',
],
'SpotMaxPricePercentageOverLowestPrice': 123,
'OnDemandMaxPricePercentageOverLowestPrice': 123,
'BareMetal': 'included'|'excluded'|'required',
'BurstablePerformance': 'included'|'excluded'|'required',
'RequireHibernateSupport': True|False,
'NetworkInterfaceCount': {
'Min': 123,
'Max': 123
},
'LocalStorage': 'included'|'excluded'|'required',
'LocalStorageTypes': [
'hdd'|'ssd',
],
'TotalLocalStorageGB': {
'Min': 123.0,
'Max': 123.0
},
'BaselineEbsBandwidthMbps': {
'Min': 123,
'Max': 123
},
'AcceleratorTypes': [
'gpu'|'fpga'|'inference',
],
'AcceleratorCount': {
'Min': 123,
'Max': 123
},
'AcceleratorManufacturers': [
'nvidia'|'amd'|'amazon-web-services'|'xilinx',
],
'AcceleratorNames': [
'a100'|'v100'|'k80'|'t4'|'m60'|'radeon-pro-v520'|'vu9p',
],
'AcceleratorTotalMemoryMiB': {
'Min': 123,
'Max': 123
},
'NetworkBandwidthGbps': {
'Min': 123.0,
'Max': 123.0
},
'AllowedInstanceTypes': [
'string',
]
}
},
]
},
'InstancesDistribution': {
'OnDemandAllocationStrategy': 'string',
'OnDemandBaseCapacity': 123,
'OnDemandPercentageAboveBaseCapacity': 123,
'SpotAllocationStrategy': 'string',
'SpotInstancePools': 123,
'SpotMaxPrice': 'string'
}
},
'MinSize': 123,
'MaxSize': 123,
'DesiredCapacity': 123,
'PredictedCapacity': 123,
'DefaultCooldown': 123,
'AvailabilityZones': [
'string',
],
'LoadBalancerNames': [
'string',
],
'TargetGroupARNs': [
'string',
],
'HealthCheckType': 'string',
'HealthCheckGracePeriod': 123,
'Instances': [
{
'InstanceId': 'string',
'InstanceType': 'string',
'AvailabilityZone': 'string',
'LifecycleState': 'Pending'|'Pending:Wait'|'Pending:Proceed'|'Quarantined'|'InService'|'Terminating'|'Terminating:Wait'|'Terminating:Proceed'|'Terminated'|'Detaching'|'Detached'|'EnteringStandby'|'Standby'|'Warmed:Pending'|'Warmed:Pending:Wait'|'Warmed:Pending:Proceed'|'Warmed:Terminating'|'Warmed:Terminating:Wait'|'Warmed:Terminating:Proceed'|'Warmed:Terminated'|'Warmed:Stopped'|'Warmed:Running'|'Warmed:Hibernated',
'HealthStatus': 'string',
'LaunchConfigurationName': 'string',
'LaunchTemplate': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'ProtectedFromScaleIn': True|False,
'WeightedCapacity': 'string'
},
],
'CreatedTime': datetime(2015, 1, 1),
'SuspendedProcesses': [
{
'ProcessName': 'string',
'SuspensionReason': 'string'
},
],
'PlacementGroup': 'string',
'VPCZoneIdentifier': 'string',
'EnabledMetrics': [
{
'Metric': 'string',
'Granularity': 'string'
},
],
'Status': 'string',
'Tags': [
{
'ResourceId': 'string',
'ResourceType': 'string',
'Key': 'string',
'Value': 'string',
'PropagateAtLaunch': True|False
},
],
'TerminationPolicies': [
'string',
],
'NewInstancesProtectedFromScaleIn': True|False,
'ServiceLinkedRoleARN': 'string',
'MaxInstanceLifetime': 123,
'CapacityRebalance': True|False,
'WarmPoolConfiguration': {
'MaxGroupPreparedCapacity': 123,
'MinSize': 123,
'PoolState': 'Stopped'|'Running'|'Hibernated',
'Status': 'PendingDelete',
'InstanceReusePolicy': {
'ReuseOnScaleIn': True|False
}
},
'WarmPoolSize': 123,
'Context': 'string',
'DesiredCapacityType': 'string',
'DefaultInstanceWarmup': 123,
'TrafficSources': [
{
'Identifier': 'string',
'Type': 'string'
},
],
'InstanceMaintenancePolicy': {
'MinHealthyPercentage': 123,
'MaxHealthyPercentage': 123
}
},
],
'NextToken': 'string'
}
Response Structure
(dict) --
AutoScalingGroups (list) --
The groups.
(dict) --
Describes an Auto Scaling group.
AutoScalingGroupName (string) --
The name of the Auto Scaling group.
AutoScalingGroupARN (string) --
The Amazon Resource Name (ARN) of the Auto Scaling group.
LaunchConfigurationName (string) --
The name of the associated launch configuration.
LaunchTemplate (dict) --
The launch template for the group.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
MixedInstancesPolicy (dict) --
The mixed instances policy for the group.
LaunchTemplate (dict) --
One or more launch templates and the instance types (overrides) that are used to launch EC2 instances to fulfill On-Demand and Spot capacities.
LaunchTemplateSpecification (dict) --
The launch template.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
Overrides (list) --
Any properties that you specify override the same properties in the launch template.
(dict) --
Use this structure to let Amazon EC2 Auto Scaling do the following when the Auto Scaling group has a mixed instances policy:
Override the instance type that is specified in the launch template.
Use multiple instance types.
Specify the instance types that you want, or define your instance requirements instead and let Amazon EC2 Auto Scaling provision the available instance types that meet your requirements. This can provide Amazon EC2 Auto Scaling with a larger selection of instance types to choose from when fulfilling Spot and On-Demand capacities. You can view which instance types are matched before you apply the instance requirements to your Auto Scaling group.
After you define your instance requirements, you don't have to keep updating these settings to get new EC2 instance types automatically. Amazon EC2 Auto Scaling uses the instance requirements of the Auto Scaling group to determine whether a new EC2 instance type can be used.
InstanceType (string) --
The instance type, such as m3.xlarge . You must specify an instance type that is supported in your requested Region and Availability Zones. For more information, see Instance types in the Amazon Elastic Compute Cloud User Guide .
You can specify up to 40 instance types per Auto Scaling group.
WeightedCapacity (string) --
If you provide a list of instance types to use, you can specify the number of capacity units provided by each instance type in terms of virtual CPUs, memory, storage, throughput, or other relative performance characteristic. When a Spot or On-Demand Instance is launched, the capacity units count toward the desired capacity. Amazon EC2 Auto Scaling launches instances until the desired capacity is totally fulfilled, even if this results in an overage. For example, if there are two units remaining to fulfill capacity, and Amazon EC2 Auto Scaling can only launch an instance with a WeightedCapacity of five units, the instance is launched, and the desired capacity is exceeded by three units. For more information, see Configuring instance weighting for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide . Value must be in the range of 1–999.
If you specify a value for WeightedCapacity for one instance type, you must specify a value for WeightedCapacity for all of them.
Warning
Every Auto Scaling group has three size parameters ( DesiredCapacity , MaxSize , and MinSize ). Usually, you set these sizes based on a specific number of instances. However, if you configure a mixed instances policy that defines weights for the instance types, you must specify these sizes with the same units that you use for weighting instances.
LaunchTemplateSpecification (dict) --
Provides a launch template for the specified instance type or set of instance requirements. For example, some instance types might require a launch template with a different AMI. If not provided, Amazon EC2 Auto Scaling uses the launch template that's specified in the LaunchTemplate definition. For more information, see Specifying a different launch template for an instance type in the Amazon EC2 Auto Scaling User Guide .
You can specify up to 20 launch templates per Auto Scaling group. The launch templates specified in the overrides and in the LaunchTemplate definition count towards this limit.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
InstanceRequirements (dict) --
The instance requirements. Amazon EC2 Auto Scaling uses your specified requirements to identify instance types. Then, it uses your On-Demand and Spot allocation strategies to launch instances from these instance types.
You can specify up to four separate sets of instance requirements per Auto Scaling group. This is useful for provisioning instances from different Amazon Machine Images (AMIs) in the same Auto Scaling group. To do this, create the AMIs and create a new launch template for each AMI. Then, create a compatible set of instance requirements for each launch template.
Note
If you specify InstanceRequirements , you can't specify InstanceType .
VCpuCount (dict) --
The minimum and maximum number of vCPUs for an instance type.
Min (integer) --
The minimum number of vCPUs.
Max (integer) --
The maximum number of vCPUs.
MemoryMiB (dict) --
The minimum and maximum instance memory size for an instance type, in MiB.
Min (integer) --
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
CpuManufacturers (list) --
Lists which specific CPU manufacturers to include.
For instance types with Intel CPUs, specify intel .
For instance types with AMD CPUs, specify amd .
For instance types with Amazon Web Services CPUs, specify amazon-web-services .
Note
Don't confuse the CPU hardware manufacturer with the CPU hardware architecture. Instances will be launched with a compatible CPU architecture based on the Amazon Machine Image (AMI) that you specify in your launch template.
Default: Any manufacturer
(string) --
MemoryGiBPerVCpu (dict) --
The minimum and maximum amount of memory per vCPU for an instance type, in GiB.
Default: No minimum or maximum limits
Min (float) --
The memory minimum in GiB.
Max (float) --
The memory maximum in GiB.
ExcludedInstanceTypes (list) --
The instance types to exclude. You can use strings with one or more wild cards, represented by an asterisk ( * ), to exclude an instance family, type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , you are excluding the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will exclude all the M5a instance types, but not the M5n instance types.
Note
If you specify ExcludedInstanceTypes , you can't specify AllowedInstanceTypes .
Default: No excluded instance types
(string) --
InstanceGenerations (list) --
Indicates whether current or previous generation instance types are included.
For current generation instance types, specify current . The current generation includes EC2 instance types currently recommended for use. This typically includes the latest two to three generations in each instance family. For more information, see Instance types in the Amazon EC2 User Guide for Linux Instances .
For previous generation instance types, specify previous .
Default: Any current or previous generation
(string) --
SpotMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for Spot Instances. This is the maximum you’ll pay for a Spot Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 100
OnDemandMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for On-Demand Instances. This is the maximum you’ll pay for an On-Demand Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 20
BareMetal (string) --
Indicates whether bare metal instance types are included, excluded, or required.
Default: excluded
BurstablePerformance (string) --
Indicates whether burstable performance instance types are included, excluded, or required. For more information, see Burstable performance instances in the Amazon EC2 User Guide for Linux Instances .
Default: excluded
RequireHibernateSupport (boolean) --
Indicates whether instance types must provide On-Demand Instance hibernation support.
Default: false
NetworkInterfaceCount (dict) --
The minimum and maximum number of network interfaces for an instance type.
Default: No minimum or maximum limits
Min (integer) --
The minimum number of network interfaces.
Max (integer) --
The maximum number of network interfaces.
LocalStorage (string) --
Indicates whether instance types with instance store volumes are included, excluded, or required. For more information, see Amazon EC2 instance store in the Amazon EC2 User Guide for Linux Instances .
Default: included
LocalStorageTypes (list) --
Indicates the type of local storage that is required.
For instance types with hard disk drive (HDD) storage, specify hdd .
For instance types with solid state drive (SSD) storage, specify ssd .
Default: Any local storage type
(string) --
TotalLocalStorageGB (dict) --
The minimum and maximum total local storage size for an instance type, in GB.
Default: No minimum or maximum limits
Min (float) --
The storage minimum in GB.
Max (float) --
The storage maximum in GB.
BaselineEbsBandwidthMbps (dict) --
The minimum and maximum baseline bandwidth performance for an instance type, in Mbps. For more information, see Amazon EBS–optimized instances in the Amazon EC2 User Guide for Linux Instances .
Default: No minimum or maximum limits
Min (integer) --
The minimum value in Mbps.
Max (integer) --
The maximum value in Mbps.
AcceleratorTypes (list) --
Lists the accelerator types that must be on an instance type.
For instance types with GPU accelerators, specify gpu .
For instance types with FPGA accelerators, specify fpga .
For instance types with inference accelerators, specify inference .
Default: Any accelerator type
(string) --
AcceleratorCount (dict) --
The minimum and maximum number of accelerators (GPUs, FPGAs, or Amazon Web Services Inferentia chips) for an instance type.
To exclude accelerator-enabled instance types, set Max to 0 .
Default: No minimum or maximum limits
Min (integer) --
The minimum value.
Max (integer) --
The maximum value.
AcceleratorManufacturers (list) --
Indicates whether instance types must have accelerators by specific manufacturers.
For instance types with NVIDIA devices, specify nvidia .
For instance types with AMD devices, specify amd .
For instance types with Amazon Web Services devices, specify amazon-web-services .
For instance types with Xilinx devices, specify xilinx .
Default: Any manufacturer
(string) --
AcceleratorNames (list) --
Lists the accelerators that must be on an instance type.
For instance types with NVIDIA A100 GPUs, specify a100 .
For instance types with NVIDIA V100 GPUs, specify v100 .
For instance types with NVIDIA K80 GPUs, specify k80 .
For instance types with NVIDIA T4 GPUs, specify t4 .
For instance types with NVIDIA M60 GPUs, specify m60 .
For instance types with AMD Radeon Pro V520 GPUs, specify radeon-pro-v520 .
For instance types with Xilinx VU9P FPGAs, specify vu9p .
Default: Any accelerator
(string) --
AcceleratorTotalMemoryMiB (dict) --
The minimum and maximum total memory size for the accelerators on an instance type, in MiB.
Default: No minimum or maximum limits
Min (integer) --
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
NetworkBandwidthGbps (dict) --
The minimum and maximum amount of network bandwidth, in gigabits per second (Gbps).
Default: No minimum or maximum limits
Min (float) --
The minimum amount of network bandwidth, in gigabits per second (Gbps).
Max (float) --
The maximum amount of network bandwidth, in gigabits per second (Gbps).
AllowedInstanceTypes (list) --
The instance types to apply your specified attributes against. All other instance types are ignored, even if they match your specified attributes.
You can use strings with one or more wild cards, represented by an asterisk ( * ), to allow an instance type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , Amazon EC2 Auto Scaling will allow the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will allow all the M5a instance types, but not the M5n instance types.
Note
If you specify AllowedInstanceTypes , you can't specify ExcludedInstanceTypes .
Default: All instance types
(string) --
InstancesDistribution (dict) --
The instances distribution.
OnDemandAllocationStrategy (string) --
The allocation strategy to apply to your On-Demand Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
lowest-price
Uses price to determine which instance types are the highest priority, launching the lowest priced instance types within an Availability Zone first. This is the default value for Auto Scaling groups that specify InstanceRequirements.
prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling launches your highest priority instance types first. If all your On-Demand capacity cannot be fulfilled using your highest priority instance type, then Amazon EC2 Auto Scaling launches the remaining capacity using the second priority instance type, and so on. This is the default value for Auto Scaling groups that don't specify InstanceRequirements and cannot be used for groups that do.
OnDemandBaseCapacity (integer) --
The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances. This base portion is launched first as your group scales.
This number has the same unit of measurement as the group's desired capacity. If you change the default unit of measurement (number of instances) by specifying weighted capacity values in your launch template overrides list, or by changing the default desired capacity type setting of the group, you must specify this number using the same unit of measurement.
Default: 0
OnDemandPercentageAboveBaseCapacity (integer) --
Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity . Expressed as a number (for example, 20 specifies 20% On-Demand Instances, 80% Spot Instances). If set to 100, only On-Demand Instances are used.
Default: 100
SpotAllocationStrategy (string) --
The allocation strategy to apply to your Spot Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
capacity-optimized
Requests Spot Instances using pools that are optimally chosen based on the available Spot capacity. This strategy has the lowest risk of interruption. To give certain instance types a higher chance of launching first, use capacity-optimized-prioritized .
capacity-optimized-prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling honors the instance type priorities on a best effort basis but optimizes for capacity first. Note that if the On-Demand allocation strategy is set to prioritized , the same priority is applied when fulfilling On-Demand capacity. This is not a valid value for Auto Scaling groups that specify InstanceRequirements.
lowest-price
Requests Spot Instances using the lowest priced pools within an Availability Zone, across the number of Spot pools that you specify for the SpotInstancePools property. To ensure that your desired capacity is met, you might receive Spot Instances from several pools. This is the default value, but it might lead to high interruption rates because this strategy only considers instance price and not available capacity.
price-capacity-optimized (recommended)
The price and capacity optimized allocation strategy looks at both price and capacity to select the Spot Instance pools that are the least likely to be interrupted and have the lowest possible price.
SpotInstancePools (integer) --
The number of Spot Instance pools across which to allocate your Spot Instances. The Spot pools are determined from the different instance types in the overrides. Valid only when the SpotAllocationStrategy is lowest-price . Value must be in the range of 1–20.
Default: 2
SpotMaxPrice (string) --
The maximum price per unit hour that you are willing to pay for a Spot Instance. If your maximum price is lower than the Spot price for the instance types that you selected, your Spot Instances are not launched. We do not recommend specifying a maximum price because it can lead to increased interruptions. When Spot Instances launch, you pay the current Spot price. To remove a maximum price that you previously set, include the property but specify an empty string ("") for the value.
Warning
If you specify a maximum price, your instances will be interrupted more frequently than if you do not specify one.
Valid Range: Minimum value of 0.001
MinSize (integer) --
The minimum size of the group.
MaxSize (integer) --
The maximum size of the group.
DesiredCapacity (integer) --
The desired size of the group.
PredictedCapacity (integer) --
The predicted capacity of the group when it has a predictive scaling policy.
DefaultCooldown (integer) --
The duration of the default cooldown period, in seconds.
AvailabilityZones (list) --
One or more Availability Zones for the group.
(string) --
LoadBalancerNames (list) --
One or more load balancers associated with the group.
(string) --
TargetGroupARNs (list) --
The Amazon Resource Names (ARN) of the target groups for your load balancer.
(string) --
HealthCheckType (string) --
A comma-separated value string of one or more health check types.
HealthCheckGracePeriod (integer) --
The duration of the health check grace period, in seconds.
Instances (list) --
The EC2 instances associated with the group.
(dict) --
Describes an EC2 instance.
InstanceId (string) --
The ID of the instance.
InstanceType (string) --
The instance type of the EC2 instance.
AvailabilityZone (string) --
The Availability Zone in which the instance is running.
LifecycleState (string) --
A description of the current lifecycle state. The Quarantined state is not used. For information about lifecycle states, see Instance lifecycle in the Amazon EC2 Auto Scaling User Guide .
HealthStatus (string) --
The last reported health status of the instance. Healthy means that the instance is healthy and should remain in service. Unhealthy means that the instance is unhealthy and that Amazon EC2 Auto Scaling should terminate and replace it.
LaunchConfigurationName (string) --
The launch configuration associated with the instance.
LaunchTemplate (dict) --
The launch template for the instance.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
ProtectedFromScaleIn (boolean) --
Indicates whether the instance is protected from termination by Amazon EC2 Auto Scaling when scaling in.
WeightedCapacity (string) --
The number of capacity units contributed by the instance based on its instance type.
Valid Range: Minimum value of 1. Maximum value of 999.
CreatedTime (datetime) --
The date and time the group was created.
SuspendedProcesses (list) --
The suspended processes associated with the group.
(dict) --
Describes an auto scaling process that has been suspended.
For more information, see Scaling processes in the Amazon EC2 Auto Scaling User Guide .
ProcessName (string) --
The name of the suspended process.
SuspensionReason (string) --
The reason that the process was suspended.
PlacementGroup (string) --
The name of the placement group into which to launch your instances, if any.
VPCZoneIdentifier (string) --
One or more subnet IDs, if applicable, separated by commas.
EnabledMetrics (list) --
The metrics enabled for the group.
(dict) --
Describes an enabled Auto Scaling group metric.
Metric (string) --
One of the following metrics:
GroupMinSize
GroupMaxSize
GroupDesiredCapacity
GroupInServiceInstances
GroupPendingInstances
GroupStandbyInstances
GroupTerminatingInstances
GroupTotalInstances
GroupInServiceCapacity
GroupPendingCapacity
GroupStandbyCapacity
GroupTerminatingCapacity
GroupTotalCapacity
WarmPoolDesiredCapacity
WarmPoolWarmedCapacity
WarmPoolPendingCapacity
WarmPoolTerminatingCapacity
WarmPoolTotalCapacity
GroupAndWarmPoolDesiredCapacity
GroupAndWarmPoolTotalCapacity
For more information, see Auto Scaling group metrics in the Amazon EC2 Auto Scaling User Guide .
Granularity (string) --
The granularity of the metric. The only valid value is 1Minute .
Status (string) --
The current state of the group when the DeleteAutoScalingGroup operation is in progress.
Tags (list) --
The tags for the group.
(dict) --
Describes a tag for an Auto Scaling group.
ResourceId (string) --
The name of the group.
ResourceType (string) --
The type of resource. The only supported value is auto-scaling-group .
Key (string) --
The tag key.
Value (string) --
The tag value.
PropagateAtLaunch (boolean) --
Determines whether the tag is added to new instances as they are launched in the group.
TerminationPolicies (list) --
The termination policies for the group.
(string) --
NewInstancesProtectedFromScaleIn (boolean) --
Indicates whether newly launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in.
ServiceLinkedRoleARN (string) --
The Amazon Resource Name (ARN) of the service-linked role that the Auto Scaling group uses to call other Amazon Web Services on your behalf.
MaxInstanceLifetime (integer) --
The maximum amount of time, in seconds, that an instance can be in service.
Valid Range: Minimum value of 0.
CapacityRebalance (boolean) --
Indicates whether Capacity Rebalancing is enabled.
WarmPoolConfiguration (dict) --
The warm pool for the group.
MaxGroupPreparedCapacity (integer) --
The maximum number of instances that are allowed to be in the warm pool or in any state except Terminated for the Auto Scaling group.
MinSize (integer) --
The minimum number of instances to maintain in the warm pool.
PoolState (string) --
The instance state to transition to after the lifecycle actions are complete.
Status (string) --
The status of a warm pool that is marked for deletion.
InstanceReusePolicy (dict) --
The instance reuse policy.
ReuseOnScaleIn (boolean) --
Specifies whether instances in the Auto Scaling group can be returned to the warm pool on scale in.
WarmPoolSize (integer) --
The current size of the warm pool.
Context (string) --
Reserved.
DesiredCapacityType (string) --
The unit of measurement for the value specified for desired capacity. Amazon EC2 Auto Scaling supports DesiredCapacityType for attribute-based instance type selection only.
DefaultInstanceWarmup (integer) --
The duration of the default instance warmup, in seconds.
TrafficSources (list) --
The traffic sources associated with this Auto Scaling group.
(dict) --
Identifying information for a traffic source.
Identifier (string) --
Identifies the traffic source.
For Application Load Balancers, Gateway Load Balancers, Network Load Balancers, and VPC Lattice, this will be the Amazon Resource Name (ARN) for a target group in this account and Region. For Classic Load Balancers, this will be the name of the Classic Load Balancer in this account and Region.
For example:
Application Load Balancer ARN: arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/my-targets/1234567890123456
Classic Load Balancer name: my-classic-load-balancer
VPC Lattice ARN: arn:aws:vpc-lattice:us-west-2:123456789012:targetgroup/tg-1234567890123456
To get the ARN of a target group for a Application Load Balancer, Gateway Load Balancer, or Network Load Balancer, or the name of a Classic Load Balancer, use the Elastic Load Balancing DescribeTargetGroups and DescribeLoadBalancers API operations.
To get the ARN of a target group for VPC Lattice, use the VPC Lattice GetTargetGroup API operation.
Type (string) --
Provides additional context for the value of Identifier .
The following lists the valid values:
elb if Identifier is the name of a Classic Load Balancer.
elbv2 if Identifier is the ARN of an Application Load Balancer, Gateway Load Balancer, or Network Load Balancer target group.
vpc-lattice if Identifier is the ARN of a VPC Lattice target group.
Required if the identifier is the name of a Classic Load Balancer.
InstanceMaintenancePolicy (dict) --
An instance maintenance policy.
MinHealthyPercentage (integer) --
Specifies the lower threshold as a percentage of the desired capacity of the Auto Scaling group. It represents the minimum percentage of the group to keep in service, healthy, and ready to use to support your workload when replacing instances. Value range is 0 to 100. After it's set, a value of -1 will clear the previously set value.
MaxHealthyPercentage (integer) --
Specifies the upper threshold as a percentage of the desired capacity of the Auto Scaling group. It represents the maximum percentage of the group that can be in service and healthy, or pending, to support your workload when replacing instances. Value range is 100 to 200. After it's set, a value of -1 will clear the previously set value.
Both MinHealthyPercentage and MaxHealthyPercentage must be specified, and the difference between them cannot be greater than 100. A large range increases the number of instances that can be replaced at the same time.
NextToken (string) --
A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.
{'InstanceRefreshes': {'Preferences': {'MaxHealthyPercentage': 'integer'}}}
Gets information about the instance refreshes for the specified Auto Scaling group.
This operation is part of the instance refresh feature in Amazon EC2 Auto Scaling, which helps you update instances in your Auto Scaling group after you make configuration changes.
To help you determine the status of an instance refresh, Amazon EC2 Auto Scaling returns information about the instance refreshes you previously initiated, including their status, start time, end time, the percentage of the instance refresh that is complete, and the number of instances remaining to update before the instance refresh is complete. If a rollback is initiated while an instance refresh is in progress, Amazon EC2 Auto Scaling also returns information about the rollback of the instance refresh.
See also: AWS API Documentation
Request Syntax
client.describe_instance_refreshes(
AutoScalingGroupName='string',
InstanceRefreshIds=[
'string',
],
NextToken='string',
MaxRecords=123
)
string
[REQUIRED]
The name of the Auto Scaling group.
list
One or more instance refresh IDs.
(string) --
string
The token for the next set of items to return. (You received this token from a previous call.)
integer
The maximum number of items to return with this call. The default value is 50 and the maximum value is 100 .
dict
Response Syntax
{
'InstanceRefreshes': [
{
'InstanceRefreshId': 'string',
'AutoScalingGroupName': 'string',
'Status': 'Pending'|'InProgress'|'Successful'|'Failed'|'Cancelling'|'Cancelled'|'RollbackInProgress'|'RollbackFailed'|'RollbackSuccessful',
'StatusReason': 'string',
'StartTime': datetime(2015, 1, 1),
'EndTime': datetime(2015, 1, 1),
'PercentageComplete': 123,
'InstancesToUpdate': 123,
'ProgressDetails': {
'LivePoolProgress': {
'PercentageComplete': 123,
'InstancesToUpdate': 123
},
'WarmPoolProgress': {
'PercentageComplete': 123,
'InstancesToUpdate': 123
}
},
'Preferences': {
'MinHealthyPercentage': 123,
'InstanceWarmup': 123,
'CheckpointPercentages': [
123,
],
'CheckpointDelay': 123,
'SkipMatching': True|False,
'AutoRollback': True|False,
'ScaleInProtectedInstances': 'Refresh'|'Ignore'|'Wait',
'StandbyInstances': 'Terminate'|'Ignore'|'Wait',
'AlarmSpecification': {
'Alarms': [
'string',
]
},
'MaxHealthyPercentage': 123
},
'DesiredConfiguration': {
'LaunchTemplate': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'MixedInstancesPolicy': {
'LaunchTemplate': {
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'Overrides': [
{
'InstanceType': 'string',
'WeightedCapacity': 'string',
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'InstanceRequirements': {
'VCpuCount': {
'Min': 123,
'Max': 123
},
'MemoryMiB': {
'Min': 123,
'Max': 123
},
'CpuManufacturers': [
'intel'|'amd'|'amazon-web-services',
],
'MemoryGiBPerVCpu': {
'Min': 123.0,
'Max': 123.0
},
'ExcludedInstanceTypes': [
'string',
],
'InstanceGenerations': [
'current'|'previous',
],
'SpotMaxPricePercentageOverLowestPrice': 123,
'OnDemandMaxPricePercentageOverLowestPrice': 123,
'BareMetal': 'included'|'excluded'|'required',
'BurstablePerformance': 'included'|'excluded'|'required',
'RequireHibernateSupport': True|False,
'NetworkInterfaceCount': {
'Min': 123,
'Max': 123
},
'LocalStorage': 'included'|'excluded'|'required',
'LocalStorageTypes': [
'hdd'|'ssd',
],
'TotalLocalStorageGB': {
'Min': 123.0,
'Max': 123.0
},
'BaselineEbsBandwidthMbps': {
'Min': 123,
'Max': 123
},
'AcceleratorTypes': [
'gpu'|'fpga'|'inference',
],
'AcceleratorCount': {
'Min': 123,
'Max': 123
},
'AcceleratorManufacturers': [
'nvidia'|'amd'|'amazon-web-services'|'xilinx',
],
'AcceleratorNames': [
'a100'|'v100'|'k80'|'t4'|'m60'|'radeon-pro-v520'|'vu9p',
],
'AcceleratorTotalMemoryMiB': {
'Min': 123,
'Max': 123
},
'NetworkBandwidthGbps': {
'Min': 123.0,
'Max': 123.0
},
'AllowedInstanceTypes': [
'string',
]
}
},
]
},
'InstancesDistribution': {
'OnDemandAllocationStrategy': 'string',
'OnDemandBaseCapacity': 123,
'OnDemandPercentageAboveBaseCapacity': 123,
'SpotAllocationStrategy': 'string',
'SpotInstancePools': 123,
'SpotMaxPrice': 'string'
}
}
},
'RollbackDetails': {
'RollbackReason': 'string',
'RollbackStartTime': datetime(2015, 1, 1),
'PercentageCompleteOnRollback': 123,
'InstancesToUpdateOnRollback': 123,
'ProgressDetailsOnRollback': {
'LivePoolProgress': {
'PercentageComplete': 123,
'InstancesToUpdate': 123
},
'WarmPoolProgress': {
'PercentageComplete': 123,
'InstancesToUpdate': 123
}
}
}
},
],
'NextToken': 'string'
}
Response Structure
(dict) --
InstanceRefreshes (list) --
The instance refreshes for the specified group, sorted by creation timestamp in descending order.
(dict) --
Describes an instance refresh for an Auto Scaling group.
InstanceRefreshId (string) --
The instance refresh ID.
AutoScalingGroupName (string) --
The name of the Auto Scaling group.
Status (string) --
The current status for the instance refresh operation:
Pending - The request was created, but the instance refresh has not started.
InProgress - An instance refresh is in progress.
Successful - An instance refresh completed successfully.
Failed - An instance refresh failed to complete. You can troubleshoot using the status reason and the scaling activities.
Cancelling - An ongoing instance refresh is being cancelled.
Cancelled - The instance refresh is cancelled.
RollbackInProgress - An instance refresh is being rolled back.
RollbackFailed - The rollback failed to complete. You can troubleshoot using the status reason and the scaling activities.
RollbackSuccessful - The rollback completed successfully.
StatusReason (string) --
The explanation for the specific status assigned to this operation.
StartTime (datetime) --
The date and time at which the instance refresh began.
EndTime (datetime) --
The date and time at which the instance refresh ended.
PercentageComplete (integer) --
The percentage of the instance refresh that is complete. For each instance replacement, Amazon EC2 Auto Scaling tracks the instance's health status and warm-up time. When the instance's health status changes to healthy and the specified warm-up time passes, the instance is considered updated and is added to the percentage complete.
Note
PercentageComplete does not include instances that are replaced during a rollback. This value gradually goes back down to zero during a rollback.
InstancesToUpdate (integer) --
The number of instances remaining to update before the instance refresh is complete.
Note
If you roll back the instance refresh, InstancesToUpdate shows you the number of instances that were not yet updated by the instance refresh. Therefore, these instances don't need to be replaced as part of the rollback.
ProgressDetails (dict) --
Additional progress details for an Auto Scaling group that has a warm pool.
LivePoolProgress (dict) --
Reports progress on replacing instances that are in the Auto Scaling group.
PercentageComplete (integer) --
The percentage of instances in the Auto Scaling group that have been replaced. For each instance replacement, Amazon EC2 Auto Scaling tracks the instance's health status and warm-up time. When the instance's health status changes to healthy and the specified warm-up time passes, the instance is considered updated and is added to the percentage complete.
InstancesToUpdate (integer) --
The number of instances remaining to update.
WarmPoolProgress (dict) --
Reports progress on replacing instances that are in the warm pool.
PercentageComplete (integer) --
The percentage of instances in the warm pool that have been replaced. For each instance replacement, Amazon EC2 Auto Scaling tracks the instance's health status and warm-up time. When the instance's health status changes to healthy and the specified warm-up time passes, the instance is considered updated and is added to the percentage complete.
InstancesToUpdate (integer) --
The number of instances remaining to update.
Preferences (dict) --
The preferences for an instance refresh.
MinHealthyPercentage (integer) --
Specifies the minimum percentage of the group to keep in service, healthy, and ready to use to support your workload to allow the operation to continue. The value is expressed as a percentage of the desired capacity of the Auto Scaling group. Value range is 0 to 100.
If you do not specify this property, the default is 90 percent, or the percentage set in the instance maintenance policy for the Auto Scaling group, if defined.
InstanceWarmup (integer) --
A time period, in seconds, during which an instance refresh waits before moving on to replacing the next instance after a new instance enters the InService state.
This property is not required for normal usage. Instead, use the DefaultInstanceWarmup property of the Auto Scaling group. The InstanceWarmup and DefaultInstanceWarmup properties work the same way. Only specify this property if you must override the DefaultInstanceWarmup property.
If you do not specify this property, the instance warmup by default is the value of the DefaultInstanceWarmup property, if defined (which is recommended in all cases), or the HealthCheckGracePeriod property otherwise.
CheckpointPercentages (list) --
(Optional) Threshold values for each checkpoint in ascending order. Each number must be unique. To replace all instances in the Auto Scaling group, the last number in the array must be 100 .
For usage examples, see Adding checkpoints to an instance refresh in the Amazon EC2 Auto Scaling User Guide .
(integer) --
CheckpointDelay (integer) --
(Optional) The amount of time, in seconds, to wait after a checkpoint before continuing. This property is optional, but if you specify a value for it, you must also specify a value for CheckpointPercentages . If you specify a value for CheckpointPercentages and not for CheckpointDelay , the CheckpointDelay defaults to 3600 (1 hour).
SkipMatching (boolean) --
(Optional) Indicates whether skip matching is enabled. If enabled ( true ), then Amazon EC2 Auto Scaling skips replacing instances that match the desired configuration. If no desired configuration is specified, then it skips replacing instances that have the same launch template and instance types that the Auto Scaling group was using before the start of the instance refresh. The default is false .
For more information, see Use an instance refresh with skip matching in the Amazon EC2 Auto Scaling User Guide .
AutoRollback (boolean) --
(Optional) Indicates whether to roll back the Auto Scaling group to its previous configuration if the instance refresh fails or a CloudWatch alarm threshold is met. The default is false .
A rollback is not supported in the following situations:
There is no desired configuration specified for the instance refresh.
The Auto Scaling group has a launch template that uses an Amazon Web Services Systems Manager parameter instead of an AMI ID for the ImageId property.
The Auto Scaling group uses the launch template's $Latest or $Default version.
For more information, see Undo changes with a rollback in the Amazon EC2 Auto Scaling User Guide .
ScaleInProtectedInstances (string) --
Choose the behavior that you want Amazon EC2 Auto Scaling to use if instances protected from scale in are found.
The following lists the valid values:
Refresh
Amazon EC2 Auto Scaling replaces instances that are protected from scale in.
Ignore
Amazon EC2 Auto Scaling ignores instances that are protected from scale in and continues to replace instances that are not protected.
Wait (default)
Amazon EC2 Auto Scaling waits one hour for you to remove scale-in protection. Otherwise, the instance refresh will fail.
StandbyInstances (string) --
Choose the behavior that you want Amazon EC2 Auto Scaling to use if instances in Standby state are found.
The following lists the valid values:
Terminate
Amazon EC2 Auto Scaling terminates instances that are in Standby .
Ignore
Amazon EC2 Auto Scaling ignores instances that are in Standby and continues to replace instances that are in the InService state.
Wait (default)
Amazon EC2 Auto Scaling waits one hour for you to return the instances to service. Otherwise, the instance refresh will fail.
AlarmSpecification (dict) --
(Optional) The CloudWatch alarm specification. CloudWatch alarms can be used to identify any issues and fail the operation if an alarm threshold is met.
Alarms (list) --
The names of one or more CloudWatch alarms to monitor for the instance refresh. You can specify up to 10 alarms.
(string) --
MaxHealthyPercentage (integer) --
Specifies the maximum percentage of the group that can be in service and healthy, or pending, to support your workload when replacing instances. The value is expressed as a percentage of the desired capacity of the Auto Scaling group. Value range is 100 to 200.
If you specify MaxHealthyPercentage , you must also specify MinHealthyPercentage , and the difference between them cannot be greater than 100. A larger range increases the number of instances that can be replaced at the same time.
If you do not specify this property, the default is 100 percent, or the percentage set in the instance maintenance policy for the Auto Scaling group, if defined.
DesiredConfiguration (dict) --
Describes the desired configuration for the instance refresh.
LaunchTemplate (dict) --
Describes the launch template and the version of the launch template that Amazon EC2 Auto Scaling uses to launch Amazon EC2 instances. For more information about launch templates, see Launch templates in the Amazon EC2 Auto Scaling User Guide .
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
MixedInstancesPolicy (dict) --
Use this structure to launch multiple instance types and On-Demand Instances and Spot Instances within a single Auto Scaling group.
A mixed instances policy contains information that Amazon EC2 Auto Scaling can use to launch instances and help optimize your costs. For more information, see Auto Scaling groups with multiple instance types and purchase options in the Amazon EC2 Auto Scaling User Guide .
LaunchTemplate (dict) --
One or more launch templates and the instance types (overrides) that are used to launch EC2 instances to fulfill On-Demand and Spot capacities.
LaunchTemplateSpecification (dict) --
The launch template.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
Overrides (list) --
Any properties that you specify override the same properties in the launch template.
(dict) --
Use this structure to let Amazon EC2 Auto Scaling do the following when the Auto Scaling group has a mixed instances policy:
Override the instance type that is specified in the launch template.
Use multiple instance types.
Specify the instance types that you want, or define your instance requirements instead and let Amazon EC2 Auto Scaling provision the available instance types that meet your requirements. This can provide Amazon EC2 Auto Scaling with a larger selection of instance types to choose from when fulfilling Spot and On-Demand capacities. You can view which instance types are matched before you apply the instance requirements to your Auto Scaling group.
After you define your instance requirements, you don't have to keep updating these settings to get new EC2 instance types automatically. Amazon EC2 Auto Scaling uses the instance requirements of the Auto Scaling group to determine whether a new EC2 instance type can be used.
InstanceType (string) --
The instance type, such as m3.xlarge . You must specify an instance type that is supported in your requested Region and Availability Zones. For more information, see Instance types in the Amazon Elastic Compute Cloud User Guide .
You can specify up to 40 instance types per Auto Scaling group.
WeightedCapacity (string) --
If you provide a list of instance types to use, you can specify the number of capacity units provided by each instance type in terms of virtual CPUs, memory, storage, throughput, or other relative performance characteristic. When a Spot or On-Demand Instance is launched, the capacity units count toward the desired capacity. Amazon EC2 Auto Scaling launches instances until the desired capacity is totally fulfilled, even if this results in an overage. For example, if there are two units remaining to fulfill capacity, and Amazon EC2 Auto Scaling can only launch an instance with a WeightedCapacity of five units, the instance is launched, and the desired capacity is exceeded by three units. For more information, see Configuring instance weighting for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide . Value must be in the range of 1–999.
If you specify a value for WeightedCapacity for one instance type, you must specify a value for WeightedCapacity for all of them.
Warning
Every Auto Scaling group has three size parameters ( DesiredCapacity , MaxSize , and MinSize ). Usually, you set these sizes based on a specific number of instances. However, if you configure a mixed instances policy that defines weights for the instance types, you must specify these sizes with the same units that you use for weighting instances.
LaunchTemplateSpecification (dict) --
Provides a launch template for the specified instance type or set of instance requirements. For example, some instance types might require a launch template with a different AMI. If not provided, Amazon EC2 Auto Scaling uses the launch template that's specified in the LaunchTemplate definition. For more information, see Specifying a different launch template for an instance type in the Amazon EC2 Auto Scaling User Guide .
You can specify up to 20 launch templates per Auto Scaling group. The launch templates specified in the overrides and in the LaunchTemplate definition count towards this limit.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
InstanceRequirements (dict) --
The instance requirements. Amazon EC2 Auto Scaling uses your specified requirements to identify instance types. Then, it uses your On-Demand and Spot allocation strategies to launch instances from these instance types.
You can specify up to four separate sets of instance requirements per Auto Scaling group. This is useful for provisioning instances from different Amazon Machine Images (AMIs) in the same Auto Scaling group. To do this, create the AMIs and create a new launch template for each AMI. Then, create a compatible set of instance requirements for each launch template.
Note
If you specify InstanceRequirements , you can't specify InstanceType .
VCpuCount (dict) --
The minimum and maximum number of vCPUs for an instance type.
Min (integer) --
The minimum number of vCPUs.
Max (integer) --
The maximum number of vCPUs.
MemoryMiB (dict) --
The minimum and maximum instance memory size for an instance type, in MiB.
Min (integer) --
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
CpuManufacturers (list) --
Lists which specific CPU manufacturers to include.
For instance types with Intel CPUs, specify intel .
For instance types with AMD CPUs, specify amd .
For instance types with Amazon Web Services CPUs, specify amazon-web-services .
Note
Don't confuse the CPU hardware manufacturer with the CPU hardware architecture. Instances will be launched with a compatible CPU architecture based on the Amazon Machine Image (AMI) that you specify in your launch template.
Default: Any manufacturer
(string) --
MemoryGiBPerVCpu (dict) --
The minimum and maximum amount of memory per vCPU for an instance type, in GiB.
Default: No minimum or maximum limits
Min (float) --
The memory minimum in GiB.
Max (float) --
The memory maximum in GiB.
ExcludedInstanceTypes (list) --
The instance types to exclude. You can use strings with one or more wild cards, represented by an asterisk ( * ), to exclude an instance family, type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , you are excluding the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will exclude all the M5a instance types, but not the M5n instance types.
Note
If you specify ExcludedInstanceTypes , you can't specify AllowedInstanceTypes .
Default: No excluded instance types
(string) --
InstanceGenerations (list) --
Indicates whether current or previous generation instance types are included.
For current generation instance types, specify current . The current generation includes EC2 instance types currently recommended for use. This typically includes the latest two to three generations in each instance family. For more information, see Instance types in the Amazon EC2 User Guide for Linux Instances .
For previous generation instance types, specify previous .
Default: Any current or previous generation
(string) --
SpotMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for Spot Instances. This is the maximum you’ll pay for a Spot Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 100
OnDemandMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for On-Demand Instances. This is the maximum you’ll pay for an On-Demand Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 20
BareMetal (string) --
Indicates whether bare metal instance types are included, excluded, or required.
Default: excluded
BurstablePerformance (string) --
Indicates whether burstable performance instance types are included, excluded, or required. For more information, see Burstable performance instances in the Amazon EC2 User Guide for Linux Instances .
Default: excluded
RequireHibernateSupport (boolean) --
Indicates whether instance types must provide On-Demand Instance hibernation support.
Default: false
NetworkInterfaceCount (dict) --
The minimum and maximum number of network interfaces for an instance type.
Default: No minimum or maximum limits
Min (integer) --
The minimum number of network interfaces.
Max (integer) --
The maximum number of network interfaces.
LocalStorage (string) --
Indicates whether instance types with instance store volumes are included, excluded, or required. For more information, see Amazon EC2 instance store in the Amazon EC2 User Guide for Linux Instances .
Default: included
LocalStorageTypes (list) --
Indicates the type of local storage that is required.
For instance types with hard disk drive (HDD) storage, specify hdd .
For instance types with solid state drive (SSD) storage, specify ssd .
Default: Any local storage type
(string) --
TotalLocalStorageGB (dict) --
The minimum and maximum total local storage size for an instance type, in GB.
Default: No minimum or maximum limits
Min (float) --
The storage minimum in GB.
Max (float) --
The storage maximum in GB.
BaselineEbsBandwidthMbps (dict) --
The minimum and maximum baseline bandwidth performance for an instance type, in Mbps. For more information, see Amazon EBS–optimized instances in the Amazon EC2 User Guide for Linux Instances .
Default: No minimum or maximum limits
Min (integer) --
The minimum value in Mbps.
Max (integer) --
The maximum value in Mbps.
AcceleratorTypes (list) --
Lists the accelerator types that must be on an instance type.
For instance types with GPU accelerators, specify gpu .
For instance types with FPGA accelerators, specify fpga .
For instance types with inference accelerators, specify inference .
Default: Any accelerator type
(string) --
AcceleratorCount (dict) --
The minimum and maximum number of accelerators (GPUs, FPGAs, or Amazon Web Services Inferentia chips) for an instance type.
To exclude accelerator-enabled instance types, set Max to 0 .
Default: No minimum or maximum limits
Min (integer) --
The minimum value.
Max (integer) --
The maximum value.
AcceleratorManufacturers (list) --
Indicates whether instance types must have accelerators by specific manufacturers.
For instance types with NVIDIA devices, specify nvidia .
For instance types with AMD devices, specify amd .
For instance types with Amazon Web Services devices, specify amazon-web-services .
For instance types with Xilinx devices, specify xilinx .
Default: Any manufacturer
(string) --
AcceleratorNames (list) --
Lists the accelerators that must be on an instance type.
For instance types with NVIDIA A100 GPUs, specify a100 .
For instance types with NVIDIA V100 GPUs, specify v100 .
For instance types with NVIDIA K80 GPUs, specify k80 .
For instance types with NVIDIA T4 GPUs, specify t4 .
For instance types with NVIDIA M60 GPUs, specify m60 .
For instance types with AMD Radeon Pro V520 GPUs, specify radeon-pro-v520 .
For instance types with Xilinx VU9P FPGAs, specify vu9p .
Default: Any accelerator
(string) --
AcceleratorTotalMemoryMiB (dict) --
The minimum and maximum total memory size for the accelerators on an instance type, in MiB.
Default: No minimum or maximum limits
Min (integer) --
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
NetworkBandwidthGbps (dict) --
The minimum and maximum amount of network bandwidth, in gigabits per second (Gbps).
Default: No minimum or maximum limits
Min (float) --
The minimum amount of network bandwidth, in gigabits per second (Gbps).
Max (float) --
The maximum amount of network bandwidth, in gigabits per second (Gbps).
AllowedInstanceTypes (list) --
The instance types to apply your specified attributes against. All other instance types are ignored, even if they match your specified attributes.
You can use strings with one or more wild cards, represented by an asterisk ( * ), to allow an instance type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , Amazon EC2 Auto Scaling will allow the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will allow all the M5a instance types, but not the M5n instance types.
Note
If you specify AllowedInstanceTypes , you can't specify ExcludedInstanceTypes .
Default: All instance types
(string) --
InstancesDistribution (dict) --
The instances distribution.
OnDemandAllocationStrategy (string) --
The allocation strategy to apply to your On-Demand Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
lowest-price
Uses price to determine which instance types are the highest priority, launching the lowest priced instance types within an Availability Zone first. This is the default value for Auto Scaling groups that specify InstanceRequirements.
prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling launches your highest priority instance types first. If all your On-Demand capacity cannot be fulfilled using your highest priority instance type, then Amazon EC2 Auto Scaling launches the remaining capacity using the second priority instance type, and so on. This is the default value for Auto Scaling groups that don't specify InstanceRequirements and cannot be used for groups that do.
OnDemandBaseCapacity (integer) --
The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances. This base portion is launched first as your group scales.
This number has the same unit of measurement as the group's desired capacity. If you change the default unit of measurement (number of instances) by specifying weighted capacity values in your launch template overrides list, or by changing the default desired capacity type setting of the group, you must specify this number using the same unit of measurement.
Default: 0
OnDemandPercentageAboveBaseCapacity (integer) --
Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity . Expressed as a number (for example, 20 specifies 20% On-Demand Instances, 80% Spot Instances). If set to 100, only On-Demand Instances are used.
Default: 100
SpotAllocationStrategy (string) --
The allocation strategy to apply to your Spot Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
capacity-optimized
Requests Spot Instances using pools that are optimally chosen based on the available Spot capacity. This strategy has the lowest risk of interruption. To give certain instance types a higher chance of launching first, use capacity-optimized-prioritized .
capacity-optimized-prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling honors the instance type priorities on a best effort basis but optimizes for capacity first. Note that if the On-Demand allocation strategy is set to prioritized , the same priority is applied when fulfilling On-Demand capacity. This is not a valid value for Auto Scaling groups that specify InstanceRequirements.
lowest-price
Requests Spot Instances using the lowest priced pools within an Availability Zone, across the number of Spot pools that you specify for the SpotInstancePools property. To ensure that your desired capacity is met, you might receive Spot Instances from several pools. This is the default value, but it might lead to high interruption rates because this strategy only considers instance price and not available capacity.
price-capacity-optimized (recommended)
The price and capacity optimized allocation strategy looks at both price and capacity to select the Spot Instance pools that are the least likely to be interrupted and have the lowest possible price.
SpotInstancePools (integer) --
The number of Spot Instance pools across which to allocate your Spot Instances. The Spot pools are determined from the different instance types in the overrides. Valid only when the SpotAllocationStrategy is lowest-price . Value must be in the range of 1–20.
Default: 2
SpotMaxPrice (string) --
The maximum price per unit hour that you are willing to pay for a Spot Instance. If your maximum price is lower than the Spot price for the instance types that you selected, your Spot Instances are not launched. We do not recommend specifying a maximum price because it can lead to increased interruptions. When Spot Instances launch, you pay the current Spot price. To remove a maximum price that you previously set, include the property but specify an empty string ("") for the value.
Warning
If you specify a maximum price, your instances will be interrupted more frequently than if you do not specify one.
Valid Range: Minimum value of 0.001
RollbackDetails (dict) --
The rollback details.
RollbackReason (string) --
The reason for this instance refresh rollback (for example, whether a manual or automatic rollback was initiated).
RollbackStartTime (datetime) --
The date and time at which the rollback began.
PercentageCompleteOnRollback (integer) --
Indicates the value of PercentageComplete at the time the rollback started.
InstancesToUpdateOnRollback (integer) --
Indicates the value of InstancesToUpdate at the time the rollback started.
ProgressDetailsOnRollback (dict) --
Reports progress on replacing instances in an Auto Scaling group that has a warm pool. This includes separate details for instances in the warm pool and instances in the Auto Scaling group (the live pool).
LivePoolProgress (dict) --
Reports progress on replacing instances that are in the Auto Scaling group.
PercentageComplete (integer) --
The percentage of instances in the Auto Scaling group that have been replaced. For each instance replacement, Amazon EC2 Auto Scaling tracks the instance's health status and warm-up time. When the instance's health status changes to healthy and the specified warm-up time passes, the instance is considered updated and is added to the percentage complete.
InstancesToUpdate (integer) --
The number of instances remaining to update.
WarmPoolProgress (dict) --
Reports progress on replacing instances that are in the warm pool.
PercentageComplete (integer) --
The percentage of instances in the warm pool that have been replaced. For each instance replacement, Amazon EC2 Auto Scaling tracks the instance's health status and warm-up time. When the instance's health status changes to healthy and the specified warm-up time passes, the instance is considered updated and is added to the percentage complete.
InstancesToUpdate (integer) --
The number of instances remaining to update.
NextToken (string) --
A string that indicates that the response contains more items than can be returned in a single response. To receive additional items, specify this string for the NextToken value when requesting the next set of items. This value is null when there are no more items to return.
{'Preferences': {'MaxHealthyPercentage': 'integer'}}
Starts an instance refresh.
This operation is part of the instance refresh feature in Amazon EC2 Auto Scaling, which helps you update instances in your Auto Scaling group. This feature is helpful, for example, when you have a new AMI or a new user data script. You just need to create a new launch template that specifies the new AMI or user data script. Then start an instance refresh to immediately begin the process of updating instances in the group.
If successful, the request's response contains a unique ID that you can use to track the progress of the instance refresh. To query its status, call the DescribeInstanceRefreshes API. To describe the instance refreshes that have already run, call the DescribeInstanceRefreshes API. To cancel an instance refresh that is in progress, use the CancelInstanceRefresh API.
An instance refresh might fail for several reasons, such as EC2 launch failures, misconfigured health checks, or not ignoring or allowing the termination of instances that are in Standby state or protected from scale in. You can monitor for failed EC2 launches using the scaling activities. To find the scaling activities, call the DescribeScalingActivities API.
If you enable auto rollback, your Auto Scaling group will be rolled back automatically when the instance refresh fails. You can enable this feature before starting an instance refresh by specifying the AutoRollback property in the instance refresh preferences. Otherwise, to roll back an instance refresh before it finishes, use the RollbackInstanceRefresh API.
See also: AWS API Documentation
Request Syntax
client.start_instance_refresh(
AutoScalingGroupName='string',
Strategy='Rolling',
DesiredConfiguration={
'LaunchTemplate': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'MixedInstancesPolicy': {
'LaunchTemplate': {
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'Overrides': [
{
'InstanceType': 'string',
'WeightedCapacity': 'string',
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'InstanceRequirements': {
'VCpuCount': {
'Min': 123,
'Max': 123
},
'MemoryMiB': {
'Min': 123,
'Max': 123
},
'CpuManufacturers': [
'intel'|'amd'|'amazon-web-services',
],
'MemoryGiBPerVCpu': {
'Min': 123.0,
'Max': 123.0
},
'ExcludedInstanceTypes': [
'string',
],
'InstanceGenerations': [
'current'|'previous',
],
'SpotMaxPricePercentageOverLowestPrice': 123,
'OnDemandMaxPricePercentageOverLowestPrice': 123,
'BareMetal': 'included'|'excluded'|'required',
'BurstablePerformance': 'included'|'excluded'|'required',
'RequireHibernateSupport': True|False,
'NetworkInterfaceCount': {
'Min': 123,
'Max': 123
},
'LocalStorage': 'included'|'excluded'|'required',
'LocalStorageTypes': [
'hdd'|'ssd',
],
'TotalLocalStorageGB': {
'Min': 123.0,
'Max': 123.0
},
'BaselineEbsBandwidthMbps': {
'Min': 123,
'Max': 123
},
'AcceleratorTypes': [
'gpu'|'fpga'|'inference',
],
'AcceleratorCount': {
'Min': 123,
'Max': 123
},
'AcceleratorManufacturers': [
'nvidia'|'amd'|'amazon-web-services'|'xilinx',
],
'AcceleratorNames': [
'a100'|'v100'|'k80'|'t4'|'m60'|'radeon-pro-v520'|'vu9p',
],
'AcceleratorTotalMemoryMiB': {
'Min': 123,
'Max': 123
},
'NetworkBandwidthGbps': {
'Min': 123.0,
'Max': 123.0
},
'AllowedInstanceTypes': [
'string',
]
}
},
]
},
'InstancesDistribution': {
'OnDemandAllocationStrategy': 'string',
'OnDemandBaseCapacity': 123,
'OnDemandPercentageAboveBaseCapacity': 123,
'SpotAllocationStrategy': 'string',
'SpotInstancePools': 123,
'SpotMaxPrice': 'string'
}
}
},
Preferences={
'MinHealthyPercentage': 123,
'InstanceWarmup': 123,
'CheckpointPercentages': [
123,
],
'CheckpointDelay': 123,
'SkipMatching': True|False,
'AutoRollback': True|False,
'ScaleInProtectedInstances': 'Refresh'|'Ignore'|'Wait',
'StandbyInstances': 'Terminate'|'Ignore'|'Wait',
'AlarmSpecification': {
'Alarms': [
'string',
]
},
'MaxHealthyPercentage': 123
}
)
string
[REQUIRED]
The name of the Auto Scaling group.
string
The strategy to use for the instance refresh. The only valid value is Rolling .
dict
The desired configuration. For example, the desired configuration can specify a new launch template or a new version of the current launch template.
Once the instance refresh succeeds, Amazon EC2 Auto Scaling updates the settings of the Auto Scaling group to reflect the new desired configuration.
Note
When you specify a new launch template or a new version of the current launch template for your desired configuration, consider enabling the SkipMatching property in preferences. If it's enabled, Amazon EC2 Auto Scaling skips replacing instances that already use the specified launch template and instance types. This can help you reduce the number of replacements that are required to apply updates.
LaunchTemplate (dict) --
Describes the launch template and the version of the launch template that Amazon EC2 Auto Scaling uses to launch Amazon EC2 instances. For more information about launch templates, see Launch templates in the Amazon EC2 Auto Scaling User Guide .
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
MixedInstancesPolicy (dict) --
Use this structure to launch multiple instance types and On-Demand Instances and Spot Instances within a single Auto Scaling group.
A mixed instances policy contains information that Amazon EC2 Auto Scaling can use to launch instances and help optimize your costs. For more information, see Auto Scaling groups with multiple instance types and purchase options in the Amazon EC2 Auto Scaling User Guide .
LaunchTemplate (dict) --
One or more launch templates and the instance types (overrides) that are used to launch EC2 instances to fulfill On-Demand and Spot capacities.
LaunchTemplateSpecification (dict) --
The launch template.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
Overrides (list) --
Any properties that you specify override the same properties in the launch template.
(dict) --
Use this structure to let Amazon EC2 Auto Scaling do the following when the Auto Scaling group has a mixed instances policy:
Override the instance type that is specified in the launch template.
Use multiple instance types.
Specify the instance types that you want, or define your instance requirements instead and let Amazon EC2 Auto Scaling provision the available instance types that meet your requirements. This can provide Amazon EC2 Auto Scaling with a larger selection of instance types to choose from when fulfilling Spot and On-Demand capacities. You can view which instance types are matched before you apply the instance requirements to your Auto Scaling group.
After you define your instance requirements, you don't have to keep updating these settings to get new EC2 instance types automatically. Amazon EC2 Auto Scaling uses the instance requirements of the Auto Scaling group to determine whether a new EC2 instance type can be used.
InstanceType (string) --
The instance type, such as m3.xlarge . You must specify an instance type that is supported in your requested Region and Availability Zones. For more information, see Instance types in the Amazon Elastic Compute Cloud User Guide .
You can specify up to 40 instance types per Auto Scaling group.
WeightedCapacity (string) --
If you provide a list of instance types to use, you can specify the number of capacity units provided by each instance type in terms of virtual CPUs, memory, storage, throughput, or other relative performance characteristic. When a Spot or On-Demand Instance is launched, the capacity units count toward the desired capacity. Amazon EC2 Auto Scaling launches instances until the desired capacity is totally fulfilled, even if this results in an overage. For example, if there are two units remaining to fulfill capacity, and Amazon EC2 Auto Scaling can only launch an instance with a WeightedCapacity of five units, the instance is launched, and the desired capacity is exceeded by three units. For more information, see Configuring instance weighting for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide . Value must be in the range of 1–999.
If you specify a value for WeightedCapacity for one instance type, you must specify a value for WeightedCapacity for all of them.
Warning
Every Auto Scaling group has three size parameters ( DesiredCapacity , MaxSize , and MinSize ). Usually, you set these sizes based on a specific number of instances. However, if you configure a mixed instances policy that defines weights for the instance types, you must specify these sizes with the same units that you use for weighting instances.
LaunchTemplateSpecification (dict) --
Provides a launch template for the specified instance type or set of instance requirements. For example, some instance types might require a launch template with a different AMI. If not provided, Amazon EC2 Auto Scaling uses the launch template that's specified in the LaunchTemplate definition. For more information, see Specifying a different launch template for an instance type in the Amazon EC2 Auto Scaling User Guide .
You can specify up to 20 launch templates per Auto Scaling group. The launch templates specified in the overrides and in the LaunchTemplate definition count towards this limit.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
InstanceRequirements (dict) --
The instance requirements. Amazon EC2 Auto Scaling uses your specified requirements to identify instance types. Then, it uses your On-Demand and Spot allocation strategies to launch instances from these instance types.
You can specify up to four separate sets of instance requirements per Auto Scaling group. This is useful for provisioning instances from different Amazon Machine Images (AMIs) in the same Auto Scaling group. To do this, create the AMIs and create a new launch template for each AMI. Then, create a compatible set of instance requirements for each launch template.
Note
If you specify InstanceRequirements , you can't specify InstanceType .
VCpuCount (dict) -- [REQUIRED]
The minimum and maximum number of vCPUs for an instance type.
Min (integer) -- [REQUIRED]
The minimum number of vCPUs.
Max (integer) --
The maximum number of vCPUs.
MemoryMiB (dict) -- [REQUIRED]
The minimum and maximum instance memory size for an instance type, in MiB.
Min (integer) -- [REQUIRED]
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
CpuManufacturers (list) --
Lists which specific CPU manufacturers to include.
For instance types with Intel CPUs, specify intel .
For instance types with AMD CPUs, specify amd .
For instance types with Amazon Web Services CPUs, specify amazon-web-services .
Note
Don't confuse the CPU hardware manufacturer with the CPU hardware architecture. Instances will be launched with a compatible CPU architecture based on the Amazon Machine Image (AMI) that you specify in your launch template.
Default: Any manufacturer
(string) --
MemoryGiBPerVCpu (dict) --
The minimum and maximum amount of memory per vCPU for an instance type, in GiB.
Default: No minimum or maximum limits
Min (float) --
The memory minimum in GiB.
Max (float) --
The memory maximum in GiB.
ExcludedInstanceTypes (list) --
The instance types to exclude. You can use strings with one or more wild cards, represented by an asterisk ( * ), to exclude an instance family, type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , you are excluding the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will exclude all the M5a instance types, but not the M5n instance types.
Note
If you specify ExcludedInstanceTypes , you can't specify AllowedInstanceTypes .
Default: No excluded instance types
(string) --
InstanceGenerations (list) --
Indicates whether current or previous generation instance types are included.
For current generation instance types, specify current . The current generation includes EC2 instance types currently recommended for use. This typically includes the latest two to three generations in each instance family. For more information, see Instance types in the Amazon EC2 User Guide for Linux Instances .
For previous generation instance types, specify previous .
Default: Any current or previous generation
(string) --
SpotMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for Spot Instances. This is the maximum you’ll pay for a Spot Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 100
OnDemandMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for On-Demand Instances. This is the maximum you’ll pay for an On-Demand Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 20
BareMetal (string) --
Indicates whether bare metal instance types are included, excluded, or required.
Default: excluded
BurstablePerformance (string) --
Indicates whether burstable performance instance types are included, excluded, or required. For more information, see Burstable performance instances in the Amazon EC2 User Guide for Linux Instances .
Default: excluded
RequireHibernateSupport (boolean) --
Indicates whether instance types must provide On-Demand Instance hibernation support.
Default: false
NetworkInterfaceCount (dict) --
The minimum and maximum number of network interfaces for an instance type.
Default: No minimum or maximum limits
Min (integer) --
The minimum number of network interfaces.
Max (integer) --
The maximum number of network interfaces.
LocalStorage (string) --
Indicates whether instance types with instance store volumes are included, excluded, or required. For more information, see Amazon EC2 instance store in the Amazon EC2 User Guide for Linux Instances .
Default: included
LocalStorageTypes (list) --
Indicates the type of local storage that is required.
For instance types with hard disk drive (HDD) storage, specify hdd .
For instance types with solid state drive (SSD) storage, specify ssd .
Default: Any local storage type
(string) --
TotalLocalStorageGB (dict) --
The minimum and maximum total local storage size for an instance type, in GB.
Default: No minimum or maximum limits
Min (float) --
The storage minimum in GB.
Max (float) --
The storage maximum in GB.
BaselineEbsBandwidthMbps (dict) --
The minimum and maximum baseline bandwidth performance for an instance type, in Mbps. For more information, see Amazon EBS–optimized instances in the Amazon EC2 User Guide for Linux Instances .
Default: No minimum or maximum limits
Min (integer) --
The minimum value in Mbps.
Max (integer) --
The maximum value in Mbps.
AcceleratorTypes (list) --
Lists the accelerator types that must be on an instance type.
For instance types with GPU accelerators, specify gpu .
For instance types with FPGA accelerators, specify fpga .
For instance types with inference accelerators, specify inference .
Default: Any accelerator type
(string) --
AcceleratorCount (dict) --
The minimum and maximum number of accelerators (GPUs, FPGAs, or Amazon Web Services Inferentia chips) for an instance type.
To exclude accelerator-enabled instance types, set Max to 0 .
Default: No minimum or maximum limits
Min (integer) --
The minimum value.
Max (integer) --
The maximum value.
AcceleratorManufacturers (list) --
Indicates whether instance types must have accelerators by specific manufacturers.
For instance types with NVIDIA devices, specify nvidia .
For instance types with AMD devices, specify amd .
For instance types with Amazon Web Services devices, specify amazon-web-services .
For instance types with Xilinx devices, specify xilinx .
Default: Any manufacturer
(string) --
AcceleratorNames (list) --
Lists the accelerators that must be on an instance type.
For instance types with NVIDIA A100 GPUs, specify a100 .
For instance types with NVIDIA V100 GPUs, specify v100 .
For instance types with NVIDIA K80 GPUs, specify k80 .
For instance types with NVIDIA T4 GPUs, specify t4 .
For instance types with NVIDIA M60 GPUs, specify m60 .
For instance types with AMD Radeon Pro V520 GPUs, specify radeon-pro-v520 .
For instance types with Xilinx VU9P FPGAs, specify vu9p .
Default: Any accelerator
(string) --
AcceleratorTotalMemoryMiB (dict) --
The minimum and maximum total memory size for the accelerators on an instance type, in MiB.
Default: No minimum or maximum limits
Min (integer) --
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
NetworkBandwidthGbps (dict) --
The minimum and maximum amount of network bandwidth, in gigabits per second (Gbps).
Default: No minimum or maximum limits
Min (float) --
The minimum amount of network bandwidth, in gigabits per second (Gbps).
Max (float) --
The maximum amount of network bandwidth, in gigabits per second (Gbps).
AllowedInstanceTypes (list) --
The instance types to apply your specified attributes against. All other instance types are ignored, even if they match your specified attributes.
You can use strings with one or more wild cards, represented by an asterisk ( * ), to allow an instance type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , Amazon EC2 Auto Scaling will allow the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will allow all the M5a instance types, but not the M5n instance types.
Note
If you specify AllowedInstanceTypes , you can't specify ExcludedInstanceTypes .
Default: All instance types
(string) --
InstancesDistribution (dict) --
The instances distribution.
OnDemandAllocationStrategy (string) --
The allocation strategy to apply to your On-Demand Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
lowest-price
Uses price to determine which instance types are the highest priority, launching the lowest priced instance types within an Availability Zone first. This is the default value for Auto Scaling groups that specify InstanceRequirements.
prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling launches your highest priority instance types first. If all your On-Demand capacity cannot be fulfilled using your highest priority instance type, then Amazon EC2 Auto Scaling launches the remaining capacity using the second priority instance type, and so on. This is the default value for Auto Scaling groups that don't specify InstanceRequirements and cannot be used for groups that do.
OnDemandBaseCapacity (integer) --
The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances. This base portion is launched first as your group scales.
This number has the same unit of measurement as the group's desired capacity. If you change the default unit of measurement (number of instances) by specifying weighted capacity values in your launch template overrides list, or by changing the default desired capacity type setting of the group, you must specify this number using the same unit of measurement.
Default: 0
OnDemandPercentageAboveBaseCapacity (integer) --
Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity . Expressed as a number (for example, 20 specifies 20% On-Demand Instances, 80% Spot Instances). If set to 100, only On-Demand Instances are used.
Default: 100
SpotAllocationStrategy (string) --
The allocation strategy to apply to your Spot Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
capacity-optimized
Requests Spot Instances using pools that are optimally chosen based on the available Spot capacity. This strategy has the lowest risk of interruption. To give certain instance types a higher chance of launching first, use capacity-optimized-prioritized .
capacity-optimized-prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling honors the instance type priorities on a best effort basis but optimizes for capacity first. Note that if the On-Demand allocation strategy is set to prioritized , the same priority is applied when fulfilling On-Demand capacity. This is not a valid value for Auto Scaling groups that specify InstanceRequirements.
lowest-price
Requests Spot Instances using the lowest priced pools within an Availability Zone, across the number of Spot pools that you specify for the SpotInstancePools property. To ensure that your desired capacity is met, you might receive Spot Instances from several pools. This is the default value, but it might lead to high interruption rates because this strategy only considers instance price and not available capacity.
price-capacity-optimized (recommended)
The price and capacity optimized allocation strategy looks at both price and capacity to select the Spot Instance pools that are the least likely to be interrupted and have the lowest possible price.
SpotInstancePools (integer) --
The number of Spot Instance pools across which to allocate your Spot Instances. The Spot pools are determined from the different instance types in the overrides. Valid only when the SpotAllocationStrategy is lowest-price . Value must be in the range of 1–20.
Default: 2
SpotMaxPrice (string) --
The maximum price per unit hour that you are willing to pay for a Spot Instance. If your maximum price is lower than the Spot price for the instance types that you selected, your Spot Instances are not launched. We do not recommend specifying a maximum price because it can lead to increased interruptions. When Spot Instances launch, you pay the current Spot price. To remove a maximum price that you previously set, include the property but specify an empty string ("") for the value.
Warning
If you specify a maximum price, your instances will be interrupted more frequently than if you do not specify one.
Valid Range: Minimum value of 0.001
dict
Sets your preferences for the instance refresh so that it performs as expected when you start it. Includes the instance warmup time, the minimum and maximum healthy percentages, and the behaviors that you want Amazon EC2 Auto Scaling to use if instances that are in Standby state or protected from scale in are found. You can also choose to enable additional features, such as the following:
Auto rollback
Checkpoints
CloudWatch alarms
Skip matching
MinHealthyPercentage (integer) --
Specifies the minimum percentage of the group to keep in service, healthy, and ready to use to support your workload to allow the operation to continue. The value is expressed as a percentage of the desired capacity of the Auto Scaling group. Value range is 0 to 100.
If you do not specify this property, the default is 90 percent, or the percentage set in the instance maintenance policy for the Auto Scaling group, if defined.
InstanceWarmup (integer) --
A time period, in seconds, during which an instance refresh waits before moving on to replacing the next instance after a new instance enters the InService state.
This property is not required for normal usage. Instead, use the DefaultInstanceWarmup property of the Auto Scaling group. The InstanceWarmup and DefaultInstanceWarmup properties work the same way. Only specify this property if you must override the DefaultInstanceWarmup property.
If you do not specify this property, the instance warmup by default is the value of the DefaultInstanceWarmup property, if defined (which is recommended in all cases), or the HealthCheckGracePeriod property otherwise.
CheckpointPercentages (list) --
(Optional) Threshold values for each checkpoint in ascending order. Each number must be unique. To replace all instances in the Auto Scaling group, the last number in the array must be 100 .
For usage examples, see Adding checkpoints to an instance refresh in the Amazon EC2 Auto Scaling User Guide .
(integer) --
CheckpointDelay (integer) --
(Optional) The amount of time, in seconds, to wait after a checkpoint before continuing. This property is optional, but if you specify a value for it, you must also specify a value for CheckpointPercentages . If you specify a value for CheckpointPercentages and not for CheckpointDelay , the CheckpointDelay defaults to 3600 (1 hour).
SkipMatching (boolean) --
(Optional) Indicates whether skip matching is enabled. If enabled ( true ), then Amazon EC2 Auto Scaling skips replacing instances that match the desired configuration. If no desired configuration is specified, then it skips replacing instances that have the same launch template and instance types that the Auto Scaling group was using before the start of the instance refresh. The default is false .
For more information, see Use an instance refresh with skip matching in the Amazon EC2 Auto Scaling User Guide .
AutoRollback (boolean) --
(Optional) Indicates whether to roll back the Auto Scaling group to its previous configuration if the instance refresh fails or a CloudWatch alarm threshold is met. The default is false .
A rollback is not supported in the following situations:
There is no desired configuration specified for the instance refresh.
The Auto Scaling group has a launch template that uses an Amazon Web Services Systems Manager parameter instead of an AMI ID for the ImageId property.
The Auto Scaling group uses the launch template's $Latest or $Default version.
For more information, see Undo changes with a rollback in the Amazon EC2 Auto Scaling User Guide .
ScaleInProtectedInstances (string) --
Choose the behavior that you want Amazon EC2 Auto Scaling to use if instances protected from scale in are found.
The following lists the valid values:
Refresh
Amazon EC2 Auto Scaling replaces instances that are protected from scale in.
Ignore
Amazon EC2 Auto Scaling ignores instances that are protected from scale in and continues to replace instances that are not protected.
Wait (default)
Amazon EC2 Auto Scaling waits one hour for you to remove scale-in protection. Otherwise, the instance refresh will fail.
StandbyInstances (string) --
Choose the behavior that you want Amazon EC2 Auto Scaling to use if instances in Standby state are found.
The following lists the valid values:
Terminate
Amazon EC2 Auto Scaling terminates instances that are in Standby .
Ignore
Amazon EC2 Auto Scaling ignores instances that are in Standby and continues to replace instances that are in the InService state.
Wait (default)
Amazon EC2 Auto Scaling waits one hour for you to return the instances to service. Otherwise, the instance refresh will fail.
AlarmSpecification (dict) --
(Optional) The CloudWatch alarm specification. CloudWatch alarms can be used to identify any issues and fail the operation if an alarm threshold is met.
Alarms (list) --
The names of one or more CloudWatch alarms to monitor for the instance refresh. You can specify up to 10 alarms.
(string) --
MaxHealthyPercentage (integer) --
Specifies the maximum percentage of the group that can be in service and healthy, or pending, to support your workload when replacing instances. The value is expressed as a percentage of the desired capacity of the Auto Scaling group. Value range is 100 to 200.
If you specify MaxHealthyPercentage , you must also specify MinHealthyPercentage , and the difference between them cannot be greater than 100. A larger range increases the number of instances that can be replaced at the same time.
If you do not specify this property, the default is 100 percent, or the percentage set in the instance maintenance policy for the Auto Scaling group, if defined.
dict
Response Syntax
{
'InstanceRefreshId': 'string'
}
Response Structure
(dict) --
InstanceRefreshId (string) --
A unique ID for tracking the progress of the instance refresh.
{'InstanceMaintenancePolicy': {'MaxHealthyPercentage': 'integer',
'MinHealthyPercentage': 'integer'}}
We strongly recommend that all Auto Scaling groups use launch templates to ensure full functionality for Amazon EC2 Auto Scaling and Amazon EC2.
Updates the configuration for the specified Auto Scaling group.
To update an Auto Scaling group, specify the name of the group and the property that you want to change. Any properties that you don't specify are not changed by this update request. The new settings take effect on any scaling activities after this call returns.
If you associate a new launch configuration or template with an Auto Scaling group, all new instances will get the updated configuration. Existing instances continue to run with the configuration that they were originally launched with. When you update a group to specify a mixed instances policy instead of a launch configuration or template, existing instances may be replaced to match the new purchasing options that you specified in the policy. For example, if the group currently has 100% On-Demand capacity and the policy specifies 50% Spot capacity, this means that half of your instances will be gradually terminated and relaunched as Spot Instances. When replacing instances, Amazon EC2 Auto Scaling launches new instances before terminating the old ones, so that updating your group does not compromise the performance or availability of your application.
Note the following about changing DesiredCapacity , MaxSize , or MinSize :
If a scale-in activity occurs as a result of a new DesiredCapacity value that is lower than the current size of the group, the Auto Scaling group uses its termination policy to determine which instances to terminate.
If you specify a new value for MinSize without specifying a value for DesiredCapacity , and the new MinSize is larger than the current size of the group, this sets the group's DesiredCapacity to the new MinSize value.
If you specify a new value for MaxSize without specifying a value for DesiredCapacity , and the new MaxSize is smaller than the current size of the group, this sets the group's DesiredCapacity to the new MaxSize value.
To see which properties have been set, call the DescribeAutoScalingGroups API. To view the scaling policies for an Auto Scaling group, call the DescribePolicies API. If the group has scaling policies, you can update them by calling the PutScalingPolicy API.
See also: AWS API Documentation
Request Syntax
client.update_auto_scaling_group(
AutoScalingGroupName='string',
LaunchConfigurationName='string',
LaunchTemplate={
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
MixedInstancesPolicy={
'LaunchTemplate': {
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'Overrides': [
{
'InstanceType': 'string',
'WeightedCapacity': 'string',
'LaunchTemplateSpecification': {
'LaunchTemplateId': 'string',
'LaunchTemplateName': 'string',
'Version': 'string'
},
'InstanceRequirements': {
'VCpuCount': {
'Min': 123,
'Max': 123
},
'MemoryMiB': {
'Min': 123,
'Max': 123
},
'CpuManufacturers': [
'intel'|'amd'|'amazon-web-services',
],
'MemoryGiBPerVCpu': {
'Min': 123.0,
'Max': 123.0
},
'ExcludedInstanceTypes': [
'string',
],
'InstanceGenerations': [
'current'|'previous',
],
'SpotMaxPricePercentageOverLowestPrice': 123,
'OnDemandMaxPricePercentageOverLowestPrice': 123,
'BareMetal': 'included'|'excluded'|'required',
'BurstablePerformance': 'included'|'excluded'|'required',
'RequireHibernateSupport': True|False,
'NetworkInterfaceCount': {
'Min': 123,
'Max': 123
},
'LocalStorage': 'included'|'excluded'|'required',
'LocalStorageTypes': [
'hdd'|'ssd',
],
'TotalLocalStorageGB': {
'Min': 123.0,
'Max': 123.0
},
'BaselineEbsBandwidthMbps': {
'Min': 123,
'Max': 123
},
'AcceleratorTypes': [
'gpu'|'fpga'|'inference',
],
'AcceleratorCount': {
'Min': 123,
'Max': 123
},
'AcceleratorManufacturers': [
'nvidia'|'amd'|'amazon-web-services'|'xilinx',
],
'AcceleratorNames': [
'a100'|'v100'|'k80'|'t4'|'m60'|'radeon-pro-v520'|'vu9p',
],
'AcceleratorTotalMemoryMiB': {
'Min': 123,
'Max': 123
},
'NetworkBandwidthGbps': {
'Min': 123.0,
'Max': 123.0
},
'AllowedInstanceTypes': [
'string',
]
}
},
]
},
'InstancesDistribution': {
'OnDemandAllocationStrategy': 'string',
'OnDemandBaseCapacity': 123,
'OnDemandPercentageAboveBaseCapacity': 123,
'SpotAllocationStrategy': 'string',
'SpotInstancePools': 123,
'SpotMaxPrice': 'string'
}
},
MinSize=123,
MaxSize=123,
DesiredCapacity=123,
DefaultCooldown=123,
AvailabilityZones=[
'string',
],
HealthCheckType='string',
HealthCheckGracePeriod=123,
PlacementGroup='string',
VPCZoneIdentifier='string',
TerminationPolicies=[
'string',
],
NewInstancesProtectedFromScaleIn=True|False,
ServiceLinkedRoleARN='string',
MaxInstanceLifetime=123,
CapacityRebalance=True|False,
Context='string',
DesiredCapacityType='string',
DefaultInstanceWarmup=123,
InstanceMaintenancePolicy={
'MinHealthyPercentage': 123,
'MaxHealthyPercentage': 123
}
)
string
[REQUIRED]
The name of the Auto Scaling group.
string
The name of the launch configuration. If you specify LaunchConfigurationName in your update request, you can't specify LaunchTemplate or MixedInstancesPolicy .
dict
The launch template and version to use to specify the updates. If you specify LaunchTemplate in your update request, you can't specify LaunchConfigurationName or MixedInstancesPolicy .
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
dict
The mixed instances policy. For more information, see Auto Scaling groups with multiple instance types and purchase options in the Amazon EC2 Auto Scaling User Guide .
LaunchTemplate (dict) --
One or more launch templates and the instance types (overrides) that are used to launch EC2 instances to fulfill On-Demand and Spot capacities.
LaunchTemplateSpecification (dict) --
The launch template.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
Overrides (list) --
Any properties that you specify override the same properties in the launch template.
(dict) --
Use this structure to let Amazon EC2 Auto Scaling do the following when the Auto Scaling group has a mixed instances policy:
Override the instance type that is specified in the launch template.
Use multiple instance types.
Specify the instance types that you want, or define your instance requirements instead and let Amazon EC2 Auto Scaling provision the available instance types that meet your requirements. This can provide Amazon EC2 Auto Scaling with a larger selection of instance types to choose from when fulfilling Spot and On-Demand capacities. You can view which instance types are matched before you apply the instance requirements to your Auto Scaling group.
After you define your instance requirements, you don't have to keep updating these settings to get new EC2 instance types automatically. Amazon EC2 Auto Scaling uses the instance requirements of the Auto Scaling group to determine whether a new EC2 instance type can be used.
InstanceType (string) --
The instance type, such as m3.xlarge . You must specify an instance type that is supported in your requested Region and Availability Zones. For more information, see Instance types in the Amazon Elastic Compute Cloud User Guide .
You can specify up to 40 instance types per Auto Scaling group.
WeightedCapacity (string) --
If you provide a list of instance types to use, you can specify the number of capacity units provided by each instance type in terms of virtual CPUs, memory, storage, throughput, or other relative performance characteristic. When a Spot or On-Demand Instance is launched, the capacity units count toward the desired capacity. Amazon EC2 Auto Scaling launches instances until the desired capacity is totally fulfilled, even if this results in an overage. For example, if there are two units remaining to fulfill capacity, and Amazon EC2 Auto Scaling can only launch an instance with a WeightedCapacity of five units, the instance is launched, and the desired capacity is exceeded by three units. For more information, see Configuring instance weighting for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide . Value must be in the range of 1–999.
If you specify a value for WeightedCapacity for one instance type, you must specify a value for WeightedCapacity for all of them.
Warning
Every Auto Scaling group has three size parameters ( DesiredCapacity , MaxSize , and MinSize ). Usually, you set these sizes based on a specific number of instances. However, if you configure a mixed instances policy that defines weights for the instance types, you must specify these sizes with the same units that you use for weighting instances.
LaunchTemplateSpecification (dict) --
Provides a launch template for the specified instance type or set of instance requirements. For example, some instance types might require a launch template with a different AMI. If not provided, Amazon EC2 Auto Scaling uses the launch template that's specified in the LaunchTemplate definition. For more information, see Specifying a different launch template for an instance type in the Amazon EC2 Auto Scaling User Guide .
You can specify up to 20 launch templates per Auto Scaling group. The launch templates specified in the overrides and in the LaunchTemplate definition count towards this limit.
LaunchTemplateId (string) --
The ID of the launch template. To get the template ID, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
LaunchTemplateName (string) --
The name of the launch template. To get the template name, use the Amazon EC2 DescribeLaunchTemplates API operation. New launch templates can be created using the Amazon EC2 CreateLaunchTemplate API.
Conditional: You must specify either a LaunchTemplateId or a LaunchTemplateName .
Version (string) --
The version number, $Latest , or $Default . To get the version number, use the Amazon EC2 DescribeLaunchTemplateVersions API operation. New launch template versions can be created using the Amazon EC2 CreateLaunchTemplateVersion API. If the value is $Latest , Amazon EC2 Auto Scaling selects the latest version of the launch template when launching instances. If the value is $Default , Amazon EC2 Auto Scaling selects the default version of the launch template when launching instances. The default value is $Default .
InstanceRequirements (dict) --
The instance requirements. Amazon EC2 Auto Scaling uses your specified requirements to identify instance types. Then, it uses your On-Demand and Spot allocation strategies to launch instances from these instance types.
You can specify up to four separate sets of instance requirements per Auto Scaling group. This is useful for provisioning instances from different Amazon Machine Images (AMIs) in the same Auto Scaling group. To do this, create the AMIs and create a new launch template for each AMI. Then, create a compatible set of instance requirements for each launch template.
Note
If you specify InstanceRequirements , you can't specify InstanceType .
VCpuCount (dict) -- [REQUIRED]
The minimum and maximum number of vCPUs for an instance type.
Min (integer) -- [REQUIRED]
The minimum number of vCPUs.
Max (integer) --
The maximum number of vCPUs.
MemoryMiB (dict) -- [REQUIRED]
The minimum and maximum instance memory size for an instance type, in MiB.
Min (integer) -- [REQUIRED]
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
CpuManufacturers (list) --
Lists which specific CPU manufacturers to include.
For instance types with Intel CPUs, specify intel .
For instance types with AMD CPUs, specify amd .
For instance types with Amazon Web Services CPUs, specify amazon-web-services .
Note
Don't confuse the CPU hardware manufacturer with the CPU hardware architecture. Instances will be launched with a compatible CPU architecture based on the Amazon Machine Image (AMI) that you specify in your launch template.
Default: Any manufacturer
(string) --
MemoryGiBPerVCpu (dict) --
The minimum and maximum amount of memory per vCPU for an instance type, in GiB.
Default: No minimum or maximum limits
Min (float) --
The memory minimum in GiB.
Max (float) --
The memory maximum in GiB.
ExcludedInstanceTypes (list) --
The instance types to exclude. You can use strings with one or more wild cards, represented by an asterisk ( * ), to exclude an instance family, type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , you are excluding the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will exclude all the M5a instance types, but not the M5n instance types.
Note
If you specify ExcludedInstanceTypes , you can't specify AllowedInstanceTypes .
Default: No excluded instance types
(string) --
InstanceGenerations (list) --
Indicates whether current or previous generation instance types are included.
For current generation instance types, specify current . The current generation includes EC2 instance types currently recommended for use. This typically includes the latest two to three generations in each instance family. For more information, see Instance types in the Amazon EC2 User Guide for Linux Instances .
For previous generation instance types, specify previous .
Default: Any current or previous generation
(string) --
SpotMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for Spot Instances. This is the maximum you’ll pay for a Spot Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 100
OnDemandMaxPricePercentageOverLowestPrice (integer) --
The price protection threshold for On-Demand Instances. This is the maximum you’ll pay for an On-Demand Instance, expressed as a percentage higher than the least expensive current generation M, C, or R instance type with your specified attributes. When Amazon EC2 Auto Scaling selects instance types with your attributes, we will exclude instance types whose price is higher than your threshold. The parameter accepts an integer, which Amazon EC2 Auto Scaling interprets as a percentage. To turn off price protection, specify a high value, such as 999999 .
If you set DesiredCapacityType to vcpu or memory-mib , the price protection threshold is applied based on the per vCPU or per memory price instead of the per instance price.
Default: 20
BareMetal (string) --
Indicates whether bare metal instance types are included, excluded, or required.
Default: excluded
BurstablePerformance (string) --
Indicates whether burstable performance instance types are included, excluded, or required. For more information, see Burstable performance instances in the Amazon EC2 User Guide for Linux Instances .
Default: excluded
RequireHibernateSupport (boolean) --
Indicates whether instance types must provide On-Demand Instance hibernation support.
Default: false
NetworkInterfaceCount (dict) --
The minimum and maximum number of network interfaces for an instance type.
Default: No minimum or maximum limits
Min (integer) --
The minimum number of network interfaces.
Max (integer) --
The maximum number of network interfaces.
LocalStorage (string) --
Indicates whether instance types with instance store volumes are included, excluded, or required. For more information, see Amazon EC2 instance store in the Amazon EC2 User Guide for Linux Instances .
Default: included
LocalStorageTypes (list) --
Indicates the type of local storage that is required.
For instance types with hard disk drive (HDD) storage, specify hdd .
For instance types with solid state drive (SSD) storage, specify ssd .
Default: Any local storage type
(string) --
TotalLocalStorageGB (dict) --
The minimum and maximum total local storage size for an instance type, in GB.
Default: No minimum or maximum limits
Min (float) --
The storage minimum in GB.
Max (float) --
The storage maximum in GB.
BaselineEbsBandwidthMbps (dict) --
The minimum and maximum baseline bandwidth performance for an instance type, in Mbps. For more information, see Amazon EBS–optimized instances in the Amazon EC2 User Guide for Linux Instances .
Default: No minimum or maximum limits
Min (integer) --
The minimum value in Mbps.
Max (integer) --
The maximum value in Mbps.
AcceleratorTypes (list) --
Lists the accelerator types that must be on an instance type.
For instance types with GPU accelerators, specify gpu .
For instance types with FPGA accelerators, specify fpga .
For instance types with inference accelerators, specify inference .
Default: Any accelerator type
(string) --
AcceleratorCount (dict) --
The minimum and maximum number of accelerators (GPUs, FPGAs, or Amazon Web Services Inferentia chips) for an instance type.
To exclude accelerator-enabled instance types, set Max to 0 .
Default: No minimum or maximum limits
Min (integer) --
The minimum value.
Max (integer) --
The maximum value.
AcceleratorManufacturers (list) --
Indicates whether instance types must have accelerators by specific manufacturers.
For instance types with NVIDIA devices, specify nvidia .
For instance types with AMD devices, specify amd .
For instance types with Amazon Web Services devices, specify amazon-web-services .
For instance types with Xilinx devices, specify xilinx .
Default: Any manufacturer
(string) --
AcceleratorNames (list) --
Lists the accelerators that must be on an instance type.
For instance types with NVIDIA A100 GPUs, specify a100 .
For instance types with NVIDIA V100 GPUs, specify v100 .
For instance types with NVIDIA K80 GPUs, specify k80 .
For instance types with NVIDIA T4 GPUs, specify t4 .
For instance types with NVIDIA M60 GPUs, specify m60 .
For instance types with AMD Radeon Pro V520 GPUs, specify radeon-pro-v520 .
For instance types with Xilinx VU9P FPGAs, specify vu9p .
Default: Any accelerator
(string) --
AcceleratorTotalMemoryMiB (dict) --
The minimum and maximum total memory size for the accelerators on an instance type, in MiB.
Default: No minimum or maximum limits
Min (integer) --
The memory minimum in MiB.
Max (integer) --
The memory maximum in MiB.
NetworkBandwidthGbps (dict) --
The minimum and maximum amount of network bandwidth, in gigabits per second (Gbps).
Default: No minimum or maximum limits
Min (float) --
The minimum amount of network bandwidth, in gigabits per second (Gbps).
Max (float) --
The maximum amount of network bandwidth, in gigabits per second (Gbps).
AllowedInstanceTypes (list) --
The instance types to apply your specified attributes against. All other instance types are ignored, even if they match your specified attributes.
You can use strings with one or more wild cards, represented by an asterisk ( * ), to allow an instance type, size, or generation. The following are examples: m5.8xlarge , c5*.* , m5a.* , r* , *3* .
For example, if you specify c5* , Amazon EC2 Auto Scaling will allow the entire C5 instance family, which includes all C5a and C5n instance types. If you specify m5a.* , Amazon EC2 Auto Scaling will allow all the M5a instance types, but not the M5n instance types.
Note
If you specify AllowedInstanceTypes , you can't specify ExcludedInstanceTypes .
Default: All instance types
(string) --
InstancesDistribution (dict) --
The instances distribution.
OnDemandAllocationStrategy (string) --
The allocation strategy to apply to your On-Demand Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
lowest-price
Uses price to determine which instance types are the highest priority, launching the lowest priced instance types within an Availability Zone first. This is the default value for Auto Scaling groups that specify InstanceRequirements.
prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling launches your highest priority instance types first. If all your On-Demand capacity cannot be fulfilled using your highest priority instance type, then Amazon EC2 Auto Scaling launches the remaining capacity using the second priority instance type, and so on. This is the default value for Auto Scaling groups that don't specify InstanceRequirements and cannot be used for groups that do.
OnDemandBaseCapacity (integer) --
The minimum amount of the Auto Scaling group's capacity that must be fulfilled by On-Demand Instances. This base portion is launched first as your group scales.
This number has the same unit of measurement as the group's desired capacity. If you change the default unit of measurement (number of instances) by specifying weighted capacity values in your launch template overrides list, or by changing the default desired capacity type setting of the group, you must specify this number using the same unit of measurement.
Default: 0
OnDemandPercentageAboveBaseCapacity (integer) --
Controls the percentages of On-Demand Instances and Spot Instances for your additional capacity beyond OnDemandBaseCapacity . Expressed as a number (for example, 20 specifies 20% On-Demand Instances, 80% Spot Instances). If set to 100, only On-Demand Instances are used.
Default: 100
SpotAllocationStrategy (string) --
The allocation strategy to apply to your Spot Instances when they are launched. Possible instance types are determined by the launch template overrides that you specify.
The following lists the valid values:
capacity-optimized
Requests Spot Instances using pools that are optimally chosen based on the available Spot capacity. This strategy has the lowest risk of interruption. To give certain instance types a higher chance of launching first, use capacity-optimized-prioritized .
capacity-optimized-prioritized
You set the order of instance types for the launch template overrides from highest to lowest priority (from first to last in the list). Amazon EC2 Auto Scaling honors the instance type priorities on a best effort basis but optimizes for capacity first. Note that if the On-Demand allocation strategy is set to prioritized , the same priority is applied when fulfilling On-Demand capacity. This is not a valid value for Auto Scaling groups that specify InstanceRequirements.
lowest-price
Requests Spot Instances using the lowest priced pools within an Availability Zone, across the number of Spot pools that you specify for the SpotInstancePools property. To ensure that your desired capacity is met, you might receive Spot Instances from several pools. This is the default value, but it might lead to high interruption rates because this strategy only considers instance price and not available capacity.
price-capacity-optimized (recommended)
The price and capacity optimized allocation strategy looks at both price and capacity to select the Spot Instance pools that are the least likely to be interrupted and have the lowest possible price.
SpotInstancePools (integer) --
The number of Spot Instance pools across which to allocate your Spot Instances. The Spot pools are determined from the different instance types in the overrides. Valid only when the SpotAllocationStrategy is lowest-price . Value must be in the range of 1–20.
Default: 2
SpotMaxPrice (string) --
The maximum price per unit hour that you are willing to pay for a Spot Instance. If your maximum price is lower than the Spot price for the instance types that you selected, your Spot Instances are not launched. We do not recommend specifying a maximum price because it can lead to increased interruptions. When Spot Instances launch, you pay the current Spot price. To remove a maximum price that you previously set, include the property but specify an empty string ("") for the value.
Warning
If you specify a maximum price, your instances will be interrupted more frequently than if you do not specify one.
Valid Range: Minimum value of 0.001
integer
The minimum size of the Auto Scaling group.
integer
The maximum size of the Auto Scaling group.
Note
With a mixed instances policy that uses instance weighting, Amazon EC2 Auto Scaling may need to go above MaxSize to meet your capacity requirements. In this event, Amazon EC2 Auto Scaling will never go above MaxSize by more than your largest instance weight (weights that define how many units each instance contributes to the desired capacity of the group).
integer
The desired capacity is the initial capacity of the Auto Scaling group after this operation completes and the capacity it attempts to maintain. This number must be greater than or equal to the minimum size of the group and less than or equal to the maximum size of the group.
integer
Only needed if you use simple scaling policies.
The amount of time, in seconds, between one scaling activity ending and another one starting due to simple scaling policies. For more information, see Scaling cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide .
list
One or more Availability Zones for the group.
(string) --
string
A comma-separated value string of one or more health check types.
The valid values are EC2 , ELB , and VPC_LATTICE . EC2 is the default health check and cannot be disabled. For more information, see Health checks for Auto Scaling instances in the Amazon EC2 Auto Scaling User Guide .
Only specify EC2 if you must clear a value that was previously set.
integer
The amount of time, in seconds, that Amazon EC2 Auto Scaling waits before checking the health status of an EC2 instance that has come into service and marking it unhealthy due to a failed health check. This is useful if your instances do not immediately pass their health checks after they enter the InService state. For more information, see Set the health check grace period for an Auto Scaling group in the Amazon EC2 Auto Scaling User Guide .
string
The name of an existing placement group into which to launch your instances. For more information, see Placement groups in the Amazon EC2 User Guide for Linux Instances .
Note
A cluster placement group is a logical grouping of instances within a single Availability Zone. You cannot specify multiple Availability Zones and a cluster placement group.
string
A comma-separated list of subnet IDs for a virtual private cloud (VPC). If you specify VPCZoneIdentifier with AvailabilityZones , the subnets that you specify must reside in those Availability Zones.
list
A policy or a list of policies that are used to select the instances to terminate. The policies are executed in the order that you list them. For more information, see Work with Amazon EC2 Auto Scaling termination policies in the Amazon EC2 Auto Scaling User Guide .
Valid values: Default | AllocationStrategy | ClosestToNextInstanceHour | NewestInstance | OldestInstance | OldestLaunchConfiguration | OldestLaunchTemplate | arn:aws:lambda:region:account-id:function:my-function:my-alias
(string) --
boolean
Indicates whether newly launched instances are protected from termination by Amazon EC2 Auto Scaling when scaling in. For more information about preventing instances from terminating on scale in, see Using instance scale-in protection in the Amazon EC2 Auto Scaling User Guide .
string
The Amazon Resource Name (ARN) of the service-linked role that the Auto Scaling group uses to call other Amazon Web Services on your behalf. For more information, see Service-linked roles in the Amazon EC2 Auto Scaling User Guide .
integer
The maximum amount of time, in seconds, that an instance can be in service. The default is null. If specified, the value must be either 0 or a number equal to or greater than 86,400 seconds (1 day). To clear a previously set value, specify a new value of 0. For more information, see Replacing Auto Scaling instances based on maximum instance lifetime in the Amazon EC2 Auto Scaling User Guide .
boolean
Enables or disables Capacity Rebalancing. For more information, see Use Capacity Rebalancing to handle Amazon EC2 Spot Interruptions in the Amazon EC2 Auto Scaling User Guide .
string
Reserved.
string
The unit of measurement for the value specified for desired capacity. Amazon EC2 Auto Scaling supports DesiredCapacityType for attribute-based instance type selection only. For more information, see Creating an Auto Scaling group using attribute-based instance type selection in the Amazon EC2 Auto Scaling User Guide .
By default, Amazon EC2 Auto Scaling specifies units , which translates into number of instances.
Valid values: units | vcpu | memory-mib
integer
The amount of time, in seconds, until a new instance is considered to have finished initializing and resource consumption to become stable after it enters the InService state.
During an instance refresh, Amazon EC2 Auto Scaling waits for the warm-up period after it replaces an instance before it moves on to replacing the next instance. Amazon EC2 Auto Scaling also waits for the warm-up period before aggregating the metrics for new instances with existing instances in the Amazon CloudWatch metrics that are used for scaling, resulting in more reliable usage data. For more information, see Set the default instance warmup for an Auto Scaling group in the Amazon EC2 Auto Scaling User Guide .
Warning
To manage various warm-up settings at the group level, we recommend that you set the default instance warmup, even if it is set to 0 seconds . To remove a value that you previously set, include the property but specify -1 for the value. However, we strongly recommend keeping the default instance warmup enabled by specifying a value of 0 or other nominal value.
dict
An instance maintenance policy. For more information, see Set instance maintenance policy in the Amazon EC2 Auto Scaling User Guide .
MinHealthyPercentage (integer) --
Specifies the lower threshold as a percentage of the desired capacity of the Auto Scaling group. It represents the minimum percentage of the group to keep in service, healthy, and ready to use to support your workload when replacing instances. Value range is 0 to 100. After it's set, a value of -1 will clear the previously set value.
MaxHealthyPercentage (integer) --
Specifies the upper threshold as a percentage of the desired capacity of the Auto Scaling group. It represents the maximum percentage of the group that can be in service and healthy, or pending, to support your workload when replacing instances. Value range is 100 to 200. After it's set, a value of -1 will clear the previously set value.
Both MinHealthyPercentage and MaxHealthyPercentage must be specified, and the difference between them cannot be greater than 100. A large range increases the number of instances that can be replaced at the same time.
None