AWS services or capabilities described in AWS Documentation may vary by region/location. Click Getting Started with Amazon AWS to see specific differences applicable to the China (Beijing) Region.
Associates an existing KMS alias with a different KMS key. Each alias is associated
with only one KMS key at a time, although a KMS key can have multiple aliases. The
alias and the KMS key must be in the same Amazon Web Services account and Region.
Adding, deleting, or updating an alias can allow or deny permission to the KMS key.
For details, see ABAC
for KMS in the Key Management Service Developer Guide.
The current and new KMS key must be the same type (both symmetric or both asymmetric or both HMAC), and they must have the same key usage. This restriction prevents errors in code that uses aliases. If you must assign an alias to a different type of KMS key, use DeleteAlias to delete the old alias and CreateAlias to create a new alias.
You cannot use UpdateAlias to change an alias name. To change an alias name,
use DeleteAlias to delete the old alias and CreateAlias to create a
new alias.
Because an alias is not a property of a KMS key, you can create, update, and delete the aliases of a KMS key without affecting the KMS key. Also, aliases do not appear in the response from the DescribeKey operation. To get the aliases of all KMS keys in the account, use the ListAliases operation.
The KMS key that you use for this operation must be in a compatible key state. For details, see Key states of KMS keys in the Key Management Service Developer Guide.
Cross-account use: No. You cannot perform this operation on a KMS key in a different Amazon Web Services account.
Required permissions
kms:UpdateAlias on the alias (IAM policy).
kms:UpdateAlias on the current KMS key (key policy).
kms:UpdateAlias on the new KMS key (key policy).
For details, see Controlling access to aliases in the Key Management Service Developer Guide.
Related operations:
Eventual consistency: The KMS API follows an eventual consistency model. For more information, see KMS eventual consistency.
For .NET Core this operation is only available in asynchronous form. Please refer to UpdateAliasAsync.
Namespace: Amazon.KeyManagementService
Assembly: AWSSDK.KeyManagementService.dll
Version: 3.x.y.z
public virtual UpdateAliasResponse UpdateAlias( UpdateAliasRequest request )
Container for the necessary parameters to execute the UpdateAlias service method.
| Exception | Condition |
|---|---|
| DependencyTimeoutException | The system timed out while trying to fulfill the request. You can retry the request. |
| KMSInternalException | The request was rejected because an internal exception occurred. The request can be retried. |
| KMSInvalidStateException | The request was rejected because the state of the specified resource is not valid for this request. This exceptions means one of the following: The key state of the KMS key is not compatible with the operation. To find the key state, use the DescribeKey operation. For more information about which key states are compatible with each KMS operation, see Key states of KMS keys in the Key Management Service Developer Guide. For cryptographic operations on KMS keys in custom key stores, this exception represents a general failure with many possible causes. To identify the cause, see the error message that accompanies the exception. |
| LimitExceededException | The request was rejected because a quota was exceeded. For more information, see Quotas in the Key Management Service Developer Guide. |
| NotFoundException | The request was rejected because the specified entity or resource could not be found. |
The following example updates the specified alias to refer to the specified KMS key.
var client = new AmazonKeyManagementServiceClient();
var response = client.UpdateAlias(new UpdateAliasRequest
{
AliasName = "alias/ExampleAlias", // The alias to update.
TargetKeyId = "1234abcd-12ab-34cd-56ef-1234567890ab" // The identifier of the KMS key that the alias will refer to after this operation succeeds. You can use the key ID or the Amazon Resource Name (ARN) of the KMS key.
});
.NET Framework:
Supported in: 4.5, 4.0, 3.5