detect-stack-resource-drift.rst

**To detect drift for a resource**

The following ``detect-stack-resource-drift`` example checks a resource named ``MyFunction`` in a stack named ``MyStack`` for drift::

    aws cloudformation detect-stack-resource-drift \
       --stack-name MyStack \
       --logical-resource-id MyFunction

The output shows an AWS Lambda function that was modified out-of-band::

    {
        "StackResourceDrift": {
            "StackId": "arn:aws:cloudformation:us-west-2:123456789012:stack/MyStack/d0a825a0-e4cd-xmpl-b9fb-061c69e99204",
            "LogicalResourceId": "MyFunction",
            "PhysicalResourceId": "my-function-SEZV4XMPL4S5",
            "ResourceType": "AWS::Lambda::Function",
            "ExpectedProperties": "{\"Description\":\"Write a file to S3.\",\"Environment\":{\"Variables\":{\"bucket\":\"my-stack-bucket-1vc62xmplgguf\"}},\"Handler\":\"index.handler\",\"MemorySize\":128,\"Role\":\"arn:aws:iam::123456789012:role/my-functionRole-HIZXMPLEOM9E\",\"Runtime\":\"nodejs10.x\",\"Tags\":[{\"Key\":\"lambda:createdBy\",\"Value\":\"SAM\"}],\"Timeout\":900,\"TracingConfig\":{\"Mode\":\"Active\"}}",
            "ActualProperties": "{\"Description\":\"Write a file to S3.\",\"Environment\":{\"Variables\":{\"bucket\":\"my-stack-bucket-1vc62xmplgguf\"}},\"Handler\":\"index.handler\",\"MemorySize\":256,\"Role\":\"arn:aws:iam::123456789012:role/my-functionRole-HIZXMPLEOM9E\",\"Runtime\":\"nodejs10.x\",\"Tags\":[{\"Key\":\"lambda:createdBy\",\"Value\":\"SAM\"}],\"Timeout\":22,\"TracingConfig\":{\"Mode\":\"Active\"}}",
            "PropertyDifferences": [
                {
                    "PropertyPath": "/MemorySize",
                    "ExpectedValue": "128",
                    "ActualValue": "256",
                    "DifferenceType": "NOT_EQUAL"
                },
                {
                    "PropertyPath": "/Timeout",
                    "ExpectedValue": "900",
                    "ActualValue": "22",
                    "DifferenceType": "NOT_EQUAL"
                }
            ],
            "StackResourceDriftStatus": "MODIFIED",
            "Timestamp": "2019-10-02T05:58:47.433Z"
        }
    }