Amazon EC2 Auto Scaling
API Reference (API Version 2011-01-01)


Describes the termination policies supported by Amazon EC2 Auto Scaling.

For more information, see Controlling Which Auto Scaling Instances Terminate During Scale In in the Amazon EC2 Auto Scaling User Guide.

Response Elements

The following element is returned by the service.


The termination policies supported by Amazon EC2 Auto Scaling: OldestInstance, OldestLaunchConfiguration, NewestInstance, ClosestToNextInstanceHour, Default, OldestLaunchTemplate, and AllocationStrategy. Currently, the OldestLaunchTemplate and AllocationStrategy policies are only supported for Auto Scaling groups with MixedInstancesPolicy.

Type: Array of strings

Length Constraints: Minimum length of 1. Maximum length of 1600.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*


For information about the errors that are common to all actions, see Common Errors.


You already have a pending update to an Auto Scaling resource (for example, a group, instance, or load balancer).

HTTP Status Code: 500


Sample Request &Version=2011-01-01 &AUTHPARAMS

Sample Response

<DescribeTerminationPolicyTypesResponse xmlns=""> <DescribeTerminationPolicyTypesResult> <TerminationPolicyTypes> <member>AllocationStrategy</member> <member>ClosestToNextInstanceHour</member> <member>Default</member> <member>NewestInstance</member> <member>OldestInstance</member> <member>OldestLaunchConfiguration</member> <member>OldestLaunchTemplate</member> </TerminationPolicyTypes> </DescribeTerminationPolicyTypesResult> <ResponseMetadata> <RequestId>7c6e177f-f082-11e1-ac58-3714bEXAMPLE</RequestId> </ResponseMetadata> </DescribeTerminationPolicyTypesResponse>

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: