lambda-versions-deleter

A serverless app could have multiple lambda functions. With continuous deployments, new versions of lambda functions get created, and there is a possibility that certain functions in your app could hit AWS Lambda's function memory allocation limit causing deployment failures. To prevent this from happening, here is a Serverless App that you can deploy independently or nest in your existing app which will clean up old versions of a lambda function on a custom schedule.

This app only deletes a maximum of oldest 10 versions of a given lambda function at any time. It sorts versions based on their LastModified attribute in ascending order, fetches top 10 or number of versions - 10 (whichever is lower) and deletes those versions. If a lambda function has less than or equal to 10 versions, the app skips processing the event. The app proactively excludes $LATEST version of a lambda function from the list of versions to delete.

App Architecture

1. This app creates a Lambda function that is invoked by a scheduled event.

Installation Instructions

1. Create an AWS account if you do not already have one and login
2. Go to the app's page on the Serverless Application Repository and click "Deploy"
3. Provide the required app parameters (see parameter details below) and click "Deploy"

App Parameters

1. LogLevel (optional) - Log level for Lambda function logging, e.g., ERROR, INFO, DEBUG, etc. Default: INFO
2. FunctionArn (required) - Specify ARN of a Lambda function for which you want the versions to be deleted
3. LambdaExectionSchedule (required) - Specify the schedule expression to invoke LambdaVersionsDeleter using https://docs.aws.amazon.com/lambda/latest/dg/tutorial-scheduled-events-schedule-expressions.html. Default: Scheduled to run once everyday at 12 pm UTC.

App Outputs

1. LambdaVersionsDeleter - Lambda Versions deleter.
2. LambdaVersionsDeleterArn - Lambda Versions deleter ARN.

License Summary

This code is made available under the Apache License 2.0 license. See the LICENSE file.