POST /#Action=ModifyInstancePlacement

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 launched, 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.

Servers

https://ec2.{region}.amazonaws.com
https://ec2.amazonaws.com
https://ec2.{region}.amazonaws.com.cn

Request headers

Name	Type	Required	Description
`X-Amz-Content-Sha256`	String	No
`X-Amz-Credential`	String	No
`Content-Type`	String	Yes	The media type of the request body. Default value: "text/xml"
`X-Amz-Date`	String	No
`X-Amz-Algorithm`	String	No
`X-Amz-SignedHeaders`	String	No
`X-Amz-Security-Token`	String	No
`X-Amz-Signature`	String	No

Query parameters

Name Type Required Description

Name	Type	Required	Description
`Version`	String	Yes	Possible values: `"2016-11-15"`
`Action`	String	Yes	Possible values: `"ModifyInstancePlacement"`

Version

String

Yes

Possible values:

"2016-11-15"

Action

String

Yes

Possible values:

"ModifyInstancePlacement"

Request body fields

Name	Type	Required	Description
`InstanceId`	String	Yes	The ID of the instance that you are modifying.
`HostResourceGroupArn`	String	No	The ARN of the host resource group in which to place the instance.
`GroupName`	String	No	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 ("").
`Tenancy`	String	No	The tenancy for the instance. For T3 instances, you can't change the tenancy from `dedicated` to `host`, or from `host` to `dedicated`. Attempting to make one of these unsupported tenancy changes results in the `InvalidTenancy` error code. Possible values: `"dedicated"` `"host"`
`HostId`	String	No	The ID of the Dedicated Host with which to associate the instance.
`GroupId`	String	No	The Group Id of a placement group. You must specify the Placement Group Group Id to launch an instance in a shared placement group.
`Affinity`	String	No	The affinity setting for the instance. Possible values: `"host"` `"default"`
`PartitionNumber`	Integer	No	The number of the partition in which to place the instance. Valid only if the placement group strategy is set to `partition`.

How to start integrating

Add HTTP Task to your workflow definition.
Search for the API you want to integrate with and click on the name.
- This loads the API reference documentation and prepares the Http request settings.
Click Test request to test run your request to the API and see the API's response.