ModifyEbsDefaultKmsKeyId - Amazon Elastic Compute Cloud


Changes the default customer master key (CMK) for EBS encryption by default for your account in this Region.

AWS creates a unique AWS managed CMK in each Region for use with encryption by default. If you change the default CMK to a symmetric customer managed CMK, it is used instead of the AWS managed CMK. To reset the default CMK to the AWS managed CMK for EBS, use ResetEbsDefaultKmsKeyId. Amazon EBS does not support asymmetric CMKs.

If you delete or disable the customer managed CMK that you specified for use with encryption by default, your instances will fail to launch.

For more information, see Amazon EBS encryption in the Amazon Elastic Compute Cloud User Guide.

Request Parameters

The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see Common Query Parameters.


Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation. Otherwise, it is UnauthorizedOperation.

Type: Boolean

Required: No


The identifier of the AWS Key Management Service (AWS KMS) customer master key (CMK) to use for Amazon EBS encryption. If this parameter is not specified, your AWS managed CMK for EBS is used. If KmsKeyId is specified, the encrypted state must be true.

You can specify the CMK using any of the following:

  • Key ID. For example, 1234abcd-12ab-34cd-56ef-1234567890ab.

  • Key alias. For example, alias/ExampleAlias.

  • Key ARN. For example, arn:aws:kms:us-east-1:012345678910:key/1234abcd-12ab-34cd-56ef-1234567890ab.

  • Alias ARN. For example, arn:aws:kms:us-east-1:012345678910:alias/ExampleAlias.

AWS authenticates the CMK asynchronously. Therefore, if you specify an ID, alias, or ARN that is not valid, the action can appear to complete, but eventually fails.

Amazon EBS does not support asymmetric CMKs.

Type: String

Required: Yes

Response Elements

The following elements are returned by the service.


The Amazon Resource Name (ARN) of the default CMK for encryption by default.

Type: String


The ID of the request.

Type: String


For information about the errors that are common to all actions, see Common client error codes.

See Also

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