Amazon Elastic Compute Cloud

2024/07/02 - Amazon Elastic Compute Cloud - 1 updated api methods

Changes  Documentation updates for Elastic Compute Cloud (EC2).

ModifyInstancePlacement (updated) Link ΒΆ
Changes (request)
{'Tenancy': {'default'}}

Modifies the placement attributes for a specified instance. You can do the following:

  • Modify the affinity between an instance and a Dedicated Host. When affinity is set to host and the instance is not associated with a specific Dedicated Host, the next time the instance is started, it is automatically associated with the host on which it lands. If the instance is restarted or rebooted, this relationship persists.

  • Change the Dedicated Host with which an instance is associated.

  • Change the instance tenancy of an instance.

  • Move an instance to or from a placement group.

At least one attribute for affinity, host ID, tenancy, or placement group name must be specified in the request. Affinity and tenancy can be modified in the same request.

To modify the host ID, tenancy, placement group, or partition for an instance, the instance must be in the stopped state.

See also: AWS API Documentation

Request Syntax

type Affinity


param Affinity

The affinity setting for the instance. For more information, see Host affinity in the Amazon EC2 User Guide .

type GroupName


param GroupName

The name of the placement group in which to place the instance. For spread placement groups, the instance must have a tenancy of default . For cluster and partition placement groups, the instance must have a tenancy of default or dedicated .

To remove an instance from a placement group, specify an empty string ("").

type HostId


param HostId

The ID of the Dedicated Host with which to associate the instance.

type InstanceId


param InstanceId


The ID of the instance that you are modifying.

type Tenancy


param Tenancy

The tenancy for the instance.


For T3 instances, you must launch the instance on a Dedicated Host to use a tenancy of host . You can't change the tenancy from host to dedicated or default . Attempting to make one of these unsupported tenancy changes results in an InvalidRequest error code.

type PartitionNumber


param PartitionNumber

The number of the partition in which to place the instance. Valid only if the placement group strategy is set to partition .

type HostResourceGroupArn


param HostResourceGroupArn

The ARN of the host resource group in which to place the instance. The instance must have a tenancy of host to specify this parameter.

type GroupId


param GroupId

The Group Id of a placement group. You must specify the Placement Group Group Id to launch an instance in a shared placement group.




Response Syntax

    'Return': True|False

Response Structure

  • (dict) --

    • Return (boolean) --

      Is true if the request succeeds, and an error otherwise.