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# Amazon EC2 示例一
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以下示例记录了 IAM 委托人使用亚马逊 EC2 管理控制台中的默认卷密钥创建加密卷。

以下示例显示了一个 CloudTrail 日志条目，在该日志条目中，用户 Alice 在 Amazon EC2 管理控制台中使用默认卷密钥创建了一个加密卷。 EC2 日志文件记录包括一个值为的`volumeId`字段`"vol-13439757"`。该 AWS KMS 记录包含一个值为的`encryptionContext`字段`"aws:ebs:id": "vol-13439757"`。同样，这两个记录的 `principalId` 和 `accountId` 都相互匹配。这些记录反映了一个事实，即创建加密卷生成的数据密钥被用于加密卷内容。

```
{
  "Records": [
     {
      "eventVersion": "1.02",
      "userIdentity": {
            "type": "IAMUser",
            "principalId": "EX_PRINCIPAL_ID",
            "arn": "arn:aws:iam::111122223333:user/Alice",
            "accountId": "111122223333",
            "accessKeyId": "EXAMPLE_KEY_ID",
            "userName": "Alice"
        },
      "eventTime": "2014-11-05T20:50:18Z",
      "eventSource": "ec2.amazonaws.com",
      "eventName": "CreateVolume",
      "awsRegion": "us-east-1",
      "sourceIPAddress": "192.0.2.0",
      "userAgent": "AWS Internal",
      "requestParameters": {
        "size": "10",
        "zone": "us-east-1a",
        "volumeType": "gp2",
        "encrypted": true
      },
      "responseElements": {
        "volumeId": "vol-13439757",
        "size": "10",
        "zone": "us-east-1a",
        "status": "creating",
        "createTime": 1415220618876,
        "volumeType": "gp2",
        "iops": 30,
        "encrypted": true
      },
      "requestID": "1565210e-73d0-4912-854c-b15ed349e526",
      "eventID": "a3447186-135f-4b00-8424-bc41f1a93b4f",
      "eventType": "AwsApiCall",
      "recipientAccountId": "123456789012"
    },
    {
      "eventVersion": "1.02",
      "userIdentity": {
        "type": "IAMUser",
        "principalId": "EX_PRINCIPAL_ID",
        "arn": "arn:aws:iam::111122223333:user/Alice",
        "accountId": "111122223333",
        "accessKeyId": "EXAMPLE_KEY_ID",
        "userName": "Alice"
      },
      "eventTime": "2014-11-05T20:50:19Z",
      "eventSource": "kms.amazonaws.com",
      "eventName": "GenerateDataKeyWithoutPlaintext",
      "awsRegion": "us-east-1",
      "sourceIPAddress": "192.0.2.0",
      "userAgent": "&AWS; Internal",
      "requestParameters": {
        "encryptionContext": {
          "aws:ebs:id": "vol-13439757"
        },
        "numberOfBytes": 64,
        "keyId": "alias/aws/ebs"
      },
      "responseElements": null,
      "requestID": "create-123456789012-758241111-1415220618",
      "eventID": "4bd2a696-d833-48cc-b72c-05e61b608399",
      "readOnly": true,
      "resources": [
        {
          "ARN": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
          "accountId": "111122223333"
        }
      ],
      "eventType": "AwsApiCall",
      "recipientAccountId": "111122223333"
    }
  ]
}
```