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SAR-Propagate-CloudFormation-Tags

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SAR app to propagate CloudFormation's stack tags to resources that are currently not propagated automatically - e.g. CloudWatch Logs. It also propagates stack tag updates to resources whose tags are not automatically updated - e.g. Step Functions and IAM roles.

Deploying to your account (via the console)

Go to this page and click the Deploy button.

This app would deploy the following resources to your region:

  • a Propagate Lambda function that propagates CloudFormation's tags to resources that aren't tagged automatically
  • a CloudWatch event pattern that triggers the Propagate function whenever CloudFormation:CreateStack and CloudFormation:UpdateStack events are captured by CloudTrail
  • a PropagateAll Lambda function that iterates through all CloudFormation stacks in the region and propates their tags, this function is only triggered once, when you deploy the SAR app
  • a Custom::LambdaInvocation CloudFormation custom resource, which would trigger the PropagateAll Lambda function during the deployment of this SAR app

Deploying via SAM/Serverless framework/CloudFormation

To deploy this app via SAM, you need something like this in the CloudFormation template:

PropagateCloudFormationTags:
  Type: AWS::Serverless::Application
  Properties:
    Location:
      ApplicationId: arn:aws:serverlessrepo:us-east-1:374852340823:applications/propagate-cfn-tags
      SemanticVersion: <enter latest version>

To do the same via CloudFormation or the Serverless framework, you need to first add the following Transform:

Transform: AWS::Serverless-2016-10-31

For more details, read this post.