# UpdatePrimaryRegion
<a name="ct-update-primary-region"></a>

The following example shows the AWS CloudTrail log entries that are generated by calling the [UpdatePrimaryRegion](https://docs.aws.amazon.com/kms/latest/APIReference/API_UpdatePrimaryRegion.html) operation on a [multi-Region key](multi-region-keys-overview.md).

The `UpdatePrimaryRegion` operation writes two CloudTrail log entries: one in the Region with the multi-Region primary key that is converted to a replica key, and one in the Region with a multi-Region replica key that is converted to a primary key.

CloudTrail log entries for this operation recorded on or after December 2022 include the key ARN of the affected KMS key in the `responseElements.keyId` value, even though this operation does not return the key ARN.

The following example shows a CloudTrail log entry for `UpdatePrimaryRegion` in the Region where the multi-Region key changed from a primary key to a replica key (us-west-2). The `primaryRegion` field shows the Region that now hosts the primary key (ap-northeast-1).

```
{
    "eventVersion": "1.08",
    "userIdentity": {
            "type": "IAMUser",
            "principalId": "EX_PRINCIPAL_ID",
            "arn": "arn:aws:iam::111122223333:user/Alice",
            "accountId": "111122223333",
            "accessKeyId": "EXAMPLE_KEY_ID",
            "userName": "Alice"
    },
    "eventTime": "2021-03-10T20:23:37Z",
    "eventSource": "kms.amazonaws.com",
    "eventName": "UpdatePrimaryRegion",
    "awsRegion": "us-west-2",
    "sourceIPAddress": "192.0.2.0",
    "userAgent": "AWS Internal",
    "requestParameters": {
        "keyId": "mrk-1234abcd12ab34cd56ef1234567890ab",
        "primaryRegion": "ap-northeast-1"
    },
    "responseElements": {
        "keyId":"arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab"
    },    
    "requestID": "ee408f36-ea01-422b-ac14-b0f147c68334",
    "eventID": "3c4226b0-1e81-48a8-a333-7fa5f3cbd118",
    "readOnly": false,
    "resources": [
        {
            "accountId": "111122223333",
            "type": "AWS::KMS::Key",
            "ARN": "arn:aws:kms:us-west-2:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab"
        }
    ],
    "eventType": "AwsApiCall",
    "managementEvent": true,
    "eventCategory": "Management",
    "recipientAccountId": "111122223333"
}
```

The following example represents the CloudTrail log entry for `UpdatePrimaryRegion` in the Region where the multi-Region key changed from a replica key to a primary key (ap-northeast-1). This log entry doesn't identify the previous primary Region.

```
{
    "eventVersion": "1.08",
    "userIdentity": {
            "type": "IAMUser",
            "principalId": "EX_PRINCIPAL_ID",
            "arn": "arn:aws:iam::111122223333:user/Alice",
            "accountId": "111122223333",
            "accessKeyId": "EXAMPLE_KEY_ID",
            "userName": "Alice",
            "invokedBy": "kms.amazonaws.com"
    },
    "eventTime": "2021-03-10T20:23:37Z",
    "eventSource": "kms.amazonaws.com",
    "eventName": "UpdatePrimaryRegion",
    "awsRegion": "ap-northeast-1",
    "sourceIPAddress": "192.0.2.0",
    "userAgent": "AWS Internal",
    "requestParameters": {
        "keyId": "arn:aws:kms:ap-northeast-1:111122223333:key/mrk-1234abcd12ab34cd56ef1234567890ab",
        "primaryRegion": "ap-northeast-1"
    },
    "responseElements": {
        "keyId":"arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab"
    },
    "requestID": "ee408f36-ea01-422b-ac14-b0f147c68334",
    "eventID": "091e6be5-737f-43c6-8431-e3679d6d0619",
    "readOnly": false,    
    "eventType": "AwsApiCall",
    "managementEvent": true,
    "eventCategory": "Management",
    "recipientAccountId": "111122223333"
}
```