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AWS CloudFormation
User Guide (API Version 2010-05-15)

Creating a Change Set

To create a change set for a running stack, submit the changes that you want to make by providing a modified template, new input parameter values, or both. AWS CloudFormation generates a change set by comparing your stack with the changes you submitted.

To modify a template, for example to add a new resource to your stack, modify a copy of the current template before creating the change set. For more information, see Modifying a Stack Template.

To create a change set (console)

  1. In the AWS CloudFormation console, from the list of stacks, select the running stack for which you want to create a change set.

  2. Choose Actions, and then choose Create Change Set.

    
              The Create Change Set For Current Stack option in the Actions menu.
  3. If you modified the stack template, specify the location of the updated template. If not, select Use current template.

    • For a template stored locally on your computer, select Upload a template to Amazon S3. Choose Choose File to navigate to the file and select it, and then click Next.

    • For a template stored in an Amazon S3 bucket, select Specify an Amazon S3 URL. Enter or paste the URL for the template, and then click Next.

      If you have a template in a versioning-enabled bucket, you can specify a specific version of the template, such as https://s3.amazonaws.com/templates/myTemplate.template?versionId=123ab1cdeKdOW5IH4GAcYbEngcpTJTDW. For more information, see Managing Objects in a Versioning-Enabled Bucket in the Amazon Simple Storage Service Console User Guide.

  4. On the Specify Details page, type information about the change set and, if necessary, modify the parameter values that you want to change, and then choose Next.

    In the Specify Details section, specify a name for the change set. You can also specify a description of the change set to identify its purpose.

    If your template contains parameters, in the Parameters section, change applicable parameter values. If you're reusing the stack's template, AWS CloudFormation populates each parameter with the current value in the stack,with the exception of parameters declared with the NoEcho attribute. To use existing values for those parameters, select Use existing value.

  5. On the Options page, you can update the stack's service role, the stack tags, or the stack's Amazon SNS notification topic, as applicable, and then choose Next.

  6. Review the changes for this change set.

    If the template includes AWS Identity and Access Management (IAM) resources, select I acknowledge that this template may create IAM resources to acknowledge that AWS CloudFormation might create IAM resources if you execute this change set. IAM resources can modify permissions in your AWS account; review these resources to ensure that you're permitting only the actions that you intend. For more information, see Controlling Access with AWS Identity and Access Management.

  7. Choose Create change set.

    You're redirected to the change set's detail page. While AWS CloudFormation generates the change set, the status of the change set is CREATE_IN_PROGRESS. After it has created the change set, AWS CloudFormation sets the status to CREATE_COMPLETE. In the Changes section, AWS CloudFormation lists all of the changes that it will make to your stack. For more information, see Viewing a Change Set.

    
            The details page for the change set.

    If AWS CloudFormation fails to create the change set (reports FAILED status), fix the error displayed in the Status field, and recreate the change set.

To create a change set (AWS CLI)

  • Run the aws cloudformation create-change-set command.

    You submit your changes as command options. You can specify new parameter values, a modified template, or both. For example, the following command creates a change set named SampleChangeSet for the SampleStack stack. The change set uses the current stack's template, but with a different value for the Purpose parameter:

    Copy
    aws cloudformation create-change-set --stack-name arn:aws:cloudformation:us-east-1:123456789012:stack/SampleStack/1a2345b6-0000-00a0-a123-00abc0abc000 --change-set-name SampleChangeSet --use-previous-template --parameters ParameterKey="InstanceType",UsePreviousValue=true ParameterKey="KeyPairName",UsePreviousValue=true ParameterKey="Purpose",ParameterValue="production"