aws lambda versions

Lambda versioning allows us to control what lambdas are run, to allow backward compatibility, testing, staging, etc.

Versioning

• When you create a lambda function, there is only 1 version: $LATEST
• When you upload a new version of the code to Lambda, the new version becomes $LATEST
• You can create multiple versions of your function and use aliases to reference them

as part of the ARN of the function * Example: Development environment may maintain multiple versions of the same function to develop and test code

• An alias is like a pointer to a specific version of the function

Example Lambda versioning:

• Versions of the lambda can be sent between different versions of functions based

on weighted percentages (%)