How to Painlessly Create and Update a CloudFormation Stack
Using AWS CLI to create a CloudFormation stack on the first run of the pipeline, while you need to update the stack for all following pipeline runs can be painful.
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When integrating CloudFormation into your CI/CD pipeline, you are faced with the challenge of creating a CloudFormation stack on the first run of the pipeline, while you need to update the stack for all following pipeline runs. If you use the AWS CLI, this is painful.
You may also have your code and template in the same repository. Therefore, code changes without the template. However, the AWS CLI threats an update without changes to a stack as an error which is not the behavior that you need in your pipeline.
cfn-create-or-update can create or update a CloudFormation stack. If no updates are to be performed, no error is thrown. cfn-create-or-update behaves exactly as the AWS CLI regarding input values, and the output will be different.
To install the CLI
cfn-create-or-update tool, run:
npm install -g cfn-create-or-update
To create or update a stack, run:
cfn-create-or-update --stack-name test --template-body file://template.yml
The first time you run this command, a stack will be created. The second time, an update will be performed — but only if the template has changed.
cfn-create-or-update behaves exactly as the AWS CLI regarding input values. Supported parameters (as documented in the AWS CLI create-stack or update-stack):
cfn-create-or-update --stack-name --template-body --template-url --parameters --capabilities --resource-types --role-arn --stack-policy-body --stack-policy-url --notification-arns --tags
Global parameters (as documented in the AWS CLI):
Only used during create, otherwise ignored (as documented in the AWS CLI create-stack):
--disable-rollback | --no-disable-rollback --timeout-in-minutes --on-failure
Only used during update, otherwise ignored (as documented in the AWS CLI update-stack):
--use-previous-template | --no-use-previous-template] --stack-policy-during-update-body --stack-policy-during-update-url
Additional parameter, to wait for create complete / update complete.
cfn-create-or-update is available on GitHub for free (MIT license).
Other solutions to this problem:
Published at DZone with permission of Michael Wittig. See the original article here.
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