How can the developer achieve this goal with the LEAST operational overhead?

A developer is deploying an AWS Lambda function. The developer wants the ability to return to older versions of the function quickly and seamlessly.

How can the developer achieve this goal with the LEAST operational overhead?
A . Use AWS OpsWorks to perform blue/green deployments.
B . Use a function alias with different versions.
C . Maintain deployment packages for older versions in Amazon S3.
D . Use AWS CodePipeline for deployments and rollbacks.

View Answer

Answer: B

Explanation:

A function alias is a pointer to a specific Lambda function version. You can use aliases to create different environments for your function, such as development, testing, and production. You can also use aliases to perform blue/green deployments by shifting traffic between two versions of your function gradually. This way, you can easily roll back to a previous version if something goes wrong, without having to redeploy your code or change your configuration.

Reference: AWS Lambda function aliases