DVA-C02: How to Use AWS Lambda Versions and Aliases for Seamless Rollbacks

Learn how to deploy AWS Lambda functions with versions and aliases to enable quick and easy rollbacks to older versions. This tutorial will show you how to use AWS CLI and AWS Console to create and manage Lambda versions and aliases with minimal operational overhead.

Question

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.

Answer

B. Use a function alias with different versions.

Explanation

The correct answer is B. Use a function alias with different versions.

The reason is that a function alias is a feature that allows the developer to create a pointer to a specific Lambda function version. A function alias can have a name, a description, and a routing configuration that can split the traffic between different versions. A function alias can help to perform safe deployments and rollbacks of Lambda functions by using the same alias name for different versions.

To meet the goal, the developer can use a function alias with different versions of the Lambda function. The developer can create and publish new versions of the Lambda function whenever there are code or configuration changes. The developer can also create an alias that points to the latest version of the Lambda function and use the alias name to invoke the function. The developer can then switch the alias to point to an older version of the Lambda function if there is a need to rollback. The developer can also use the routing configuration of the alias to perform gradual deployments or testing of new versions by splitting the traffic between different versions.

Therefore, using a function alias with different versions of the Lambda function will achieve the goal with the least operational overhead.

The other options are incorrect because they are not efficient, reliable, or applicable:

A. Using AWS OpsWorks to perform blue/green deployments is not applicable. AWS OpsWorks is a service that can automate the configuration and deployment of applications on EC2 instances or on-premises servers. However, AWS OpsWorks does not support deploying Lambda functions directly.

C. Maintaining deployment packages for older versions in S3 is not efficient or reliable. S3 is a service that can store any amount of data in objects. However, this option requires additional steps and costs to store and retrieve the deployment packages in S3. Moreover, this option does not provide an easy way to switch between different versions of the Lambda function without redeploying them.

D. Using AWS CodePipeline for deployments and rollbacks is not efficient. AWS CodePipeline is a service that can automate the continuous delivery of applications by using pipelines that consist of stages and actions. However, this option requires additional steps and costs to set up and maintain the pipelines and actions for deploying and rolling back Lambda functions. Moreover, this option does not provide an easy way to switch between different versions of the Lambda function without running the pipeline again.

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