How to include Serverless Repository apps in serverless.yml
Over the past year, the Serverless Application Repository (SAR) service has improved a lot. I have grown to enjoy it more and more, and have contributed a few applications myself:
- lambda-janitor: cron job to delete old, unused versions of all Lambda functions in the region to free up storage space.
- auto-subscribe-log-group-to-arn: subscribes new and existing CloudWatch log groups to a Lambda function, Kinesis stream, or Firehose delivery stream by ARN.
- auto-set-log-group-retention: updates the retention policy for new and existing CloudWatch log groups to a specified number of days to reduce CloudWatch Logs cost.
However, CloudFormation does not natively support the
AWS::Serverless::Application resource type. Until recently, I had to use the SAM deployment framework in order to include a SAR app in my stack. That is, until the 1.41.0 release of the Serverless framework.
In this release, the Serverless framework has added support for CloudFormation’s Transform directive. This means we can use the same magic source (CloudFormation macros) that powers SAM!
To add a Serverless Repository app to your
serverless.yml you will need to:
Transform: AWS::Serverless-2016-10-31to the
resourcessection of your
serverless.yml. This enables a global macro that will run over the whole CloudFormation stack and transform special resources as necessary. In this case, it'll transform
AWS::Serverless::Applicationresources into nested CloudFormation stacks.
- Add Serverless Repository apps as additional CloudFormation resources. These should have the resource type
For example, to include the
auto-subscribe-log-group-to-arn app as part of a serverless.yml, I will need the following:
And that’s it, that’s how you can include Serverless Repository apps in your
Hi, my name is Yan Cui. I’m an AWS Serverless Hero and the author of Production-Ready Serverless. I have run production workload at scale in AWS for nearly 10 years and I have been an architect or principal engineer with a variety of industries ranging from banking, e-commerce, sports streaming to mobile gaming. I currently work as an independent consultant focused on AWS and serverless.
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Originally published at https://theburningmonk.com on May 12, 2019.