# ModifyEbsDefaultKmsKeyId
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Changes the default Amazon KMS key for EBS encryption by default for your account in this Region.

 Amazon creates a unique Amazon managed KMS key in each Region for use with encryption by default. If you change the default KMS key to a symmetric customer managed KMS key, it is used instead of the Amazon managed KMS key. Amazon EBS does not support asymmetric KMS keys.

To reset the default KMS key to the Amazon managed KMS key for EBS, use [ResetEbsDefaultKmsKeyId](API_ResetEbsDefaultKmsKeyId.md).

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

For more information, see [Amazon EBS encryption](https://docs.amazonaws.cn/ebs/latest/userguide/ebs-encryption.html) in the *Amazon EBS User Guide*.

## Request Parameters
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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](CommonParameters.md).

 **DryRun**   
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

 **KmsKeyId**   
The identifier of the Amazon KMS key to use for Amazon EBS encryption. If this parameter is not specified, your Amazon KMS key for Amazon EBS is used. If `KmsKeyId` is specified, the encrypted state must be `true`.  
You can specify the KMS key 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.
 Amazon authenticates the KMS key 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 KMS keys.  
Type: String  
Required: Yes

## Response Elements
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The following elements are returned by the service.

 **kmsKeyId**   
The Amazon Resource Name (ARN) of the default KMS key for encryption by default.  
Type: String

 **requestId**   
The ID of the request.  
Type: String

## Errors
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For information about the errors that are common to all actions, see [Common client error codes](errors-overview.md#CommonErrors).

## See Also
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For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon Command Line Interface V2](https://docs.amazonaws.cn/goto/cli2/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for .NET V4](https://docs.amazonaws.cn/goto/DotNetSDKV4/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for Go v2](https://docs.amazonaws.cn/goto/SdkForGoV2/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for JavaScript V3](https://docs.amazonaws.cn/goto/SdkForJavaScriptV3/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for Kotlin](https://docs.amazonaws.cn/goto/SdkForKotlin/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for PHP V3](https://docs.amazonaws.cn/goto/SdkForPHPV3/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for Python](https://docs.amazonaws.cn/goto/boto3/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/ec2-2016-11-15/ModifyEbsDefaultKmsKeyId)