Reverting an import operation - Amazon CloudFormation
Revert an import operation using the Amazon Web Services Management ConsoleRevert an import operation using the Amazon CLI
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Reverting an import operation

To revert an import operation, specify a Retain deletion policy for the resource you want to remove from the template to ensure that it's preserved when you delete it from the stack.

Revert an import operation using the Amazon Web Services Management Console

  1. Specify a Retain DeletionPolicy for the resources you want to remove from your stack. In the following example template, GamesTable is the target of this revert operation.

    Example JSON
    {
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "Import test",
    "Resources": {
        "ServiceTable":{
           "Type":"AWS::DynamoDB::Table",
           "Properties":{
              "TableName":"Service",
              "AttributeDefinitions":[
                 {
                    "AttributeName":"key",
                    "AttributeType":"S"
                 }
              ],
              "KeySchema":[
                 {
                    "AttributeName":"key",
                    "KeyType":"HASH"
                 }
              ],
              "ProvisionedThroughput":{
                 "ReadCapacityUnits":5,
                 "WriteCapacityUnits":1
              }
           }
        },
        "GamesTable": {
            "Type": "AWS::DynamoDB::Table",
            "DeletionPolicy": "Retain",
            "Properties": {
                "TableName": "Games",
                "AttributeDefinitions": [
                    {
                        "AttributeName": "key",
                        "AttributeType": "S"
                    }
                ],
                "KeySchema": [
                    {
                        "AttributeName": "key",
                        "KeyType": "HASH"
                    }
                ],
                "ProvisionedThroughput": {
                    "ReadCapacityUnits": 5,
                    "WriteCapacityUnits": 1
                }
            }
        }
    }
}

  2. Open the Amazon CloudFormation console to perform a stack update to apply the deletion policy.

    1. On the Stacks page, with the stack selected, choose Update, and then choose Update stack (standard).

    2. Under Prepare template, choose Replace current template.

    3. Under Specify template, provide the updated source template with the DeletionPolicy attribute on GamesTable, and then choose Next.

      • Choose Amazon S3 URL, and then specify the URL to the updated source template in the text box.

      • Choose Upload a template file, and then browse for the updated source template file.

    4. On the Specify stack details page, no changes are required. Choose Next.

    5. On the Configure stack options page, no changes are required. Choose Next.

    6. On the Review stack_name page, review your changes. If your template contains IAM resources, select I acknowledge that this template may create IAM resources to specify that you want to use IAM resources in the template. For more information about using IAM resources in templates, see Controlling access with Amazon Identity and Access Management. Then, either update your source stack by creating a change set or update your source stack directly.

  3. Remove the resource, related parameters, and outputs from the stack template. In this example, the template now looks like the following.

    Example JSON
    {
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "Import test",
    "Resources": {
        "ServiceTable":{
           "Type":"AWS::DynamoDB::Table",
           "Properties":{
              "TableName":"Service",
              "AttributeDefinitions":[
                 {
                    "AttributeName":"key",
                    "AttributeType":"S"
                 }
              ],
              "KeySchema":[
                 {
                    "AttributeName":"key",
                    "KeyType":"HASH"
                 }
              ],
              "ProvisionedThroughput":{
                 "ReadCapacityUnits":5,
                 "WriteCapacityUnits":1
              }
           }
        }
    }
}

  4. Repeat step 2 to delete the resource (GamesTable) and its related parameters and outputs from the stack.

Revert an import operation using the Amazon CLI

  1. Specify a Retain DeletionPolicy for the resources you want to remove from your stack. In the following example template, GamesTable is the target of this revert operation.

    Example JSON
    {
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "Import test",
    "Resources": {
        "ServiceTable":{
           "Type":"AWS::DynamoDB::Table",
           "Properties":{
              "TableName":"Service",
              "AttributeDefinitions":[
                 {
                    "AttributeName":"key",
                    "AttributeType":"S"
                 }
              ],
              "KeySchema":[
                 {
                    "AttributeName":"key",
                    "KeyType":"HASH"
                 }
              ],
              "ProvisionedThroughput":{
                 "ReadCapacityUnits":5,
                 "WriteCapacityUnits":1
              }
           }
        },
        "GamesTable": {
            "Type": "AWS::DynamoDB::Table",
            "DeletionPolicy": "Retain",
            "Properties": {
                "TableName": "Games",
                "AttributeDefinitions": [
                    {
                        "AttributeName": "key",
                        "AttributeType": "S"
                    }
                ],
                "KeySchema": [
                    {
                        "AttributeName": "key",
                        "KeyType": "HASH"
                    }
                ],
                "ProvisionedThroughput": {
                    "ReadCapacityUnits": 5,
                    "WriteCapacityUnits": 1
                }
            }
        }
    }
}

  2. Update the stack to apply the deletion policy to the resource.

    update-stack --stack-name "stack-name"

  3. Remove the resource, related parameters, and outputs from the stack template. In this example, the template now looks like the following.

    Example JSON
    {
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "Import test",
    "Resources": {
        "ServiceTable":{
           "Type":"AWS::DynamoDB::Table",
           "Properties":{
              "TableName":"Service",
              "AttributeDefinitions":[
                 {
                    "AttributeName":"key",
                    "AttributeType":"S"
                 }
              ],
              "KeySchema":[
                 {
                    "AttributeName":"key",
                    "KeyType":"HASH"
                 }
              ],
              "ProvisionedThroughput":{
                 "ReadCapacityUnits":5,
                 "WriteCapacityUnits":1
              }
           }
        }
    }
}

  4. Update the stack to delete the resource (GamesTable) and its related parameters and outputs from the stack.

    update-stack --stack-name "stack-name"