NodeJS Script to prune old Lambda versions
This is not an original idea. It's a rewrite of https://github.com/epsagon/clear-lambda-storage, a Python script that does exactly what this script does.
Just for some context, Lambda has a 75GB limit which at my work we are hitting every 5 or 6 days due to huge deploys. We need to schedule a task to delete all the old versions daily.
Python 2 and Python 3 are a real headache. Sorry Python fans. I had to heavily edit the above script just to get it running on my laptop, stuff like Queue not being found etc. Then I couldn't run it on Lambda or even an EC2 Ubuntu box. I was getting obscure errors from Boto3.
So I figured it would probably be faster just to rewrite it in Node.js. Then I can actually put this on Lambda and it will be able to prune itself.
The script will not delete:
- Anything on
$LATEST - Anything with a linked alias
- Lambda@Edge functions
Any other version across all your regions will get deleted.
Don't worry, this won't delete itself due to the $LATEST rule.
You'll see deleted: 3 and skipped: 1 in the logs. If you want to see the full reasons why certain versions are being skipped, just add DEBUG=1 (or anything else truthy) to your environment.
# Set up your credentials
pip install awscli
aws configure
npm install
npm test
NB: Your Lambda needs to be configured properly. See the next section.
LAMBDA_NAME=my-script REGION=eu-west-1 bash deploy.sh
Make sure you have authenticated using aws configure.
Zip it up with the node_modules included and point to index.handler.
index.handler should be the entry point on your Lambda. I've tested with Node 12.
You need the following permissions on your execution role:
AWSLambdaFullAccess- for managing LambdasAmazonEC2ReadOnlyAccess- for listing out EC2 regionsCloudWatchLogsFullAccess- for logging
I recommend a 5 minute timeout on the Lambda function.
PRs appreciated ❤️