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DVA-C02: How to Deploy AWS Lambda Functions with Version Control and Rollback

Learn how to use AWS Lambda function aliases to deploy different versions of your code and switch between them easily. Find out how to reduce the operational overhead and improve the reliability of your deployments.

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.

This answer is based on the documentation of AWS Lambda, which states that a function alias is a pointer to a specific function version. Each alias has a unique Amazon Resource Name (ARN) and can be updated to point to a different version. By using a function alias, the developer can easily switch between different versions of the Lambda function without changing the way the function is invoked.

The other options are not as suitable because:

  • Option A: Using AWS OpsWorks to perform blue/green deployments is not the best solution for deploying Lambda functions, as OpsWorks is designed for managing applications on Amazon EC2 instances or on-premises servers. OpsWorks uses Chef or Puppet configuration management tools to automate how servers are configured, deployed, and managed. Lambda functions do not require servers or configuration management tools, and can be deployed using AWS CodeDeploy, which supports blue/green deployments for Lambda functions.
  • Option C: Maintaining deployment packages for older versions in Amazon S3 is not the best solution for deploying Lambda functions, as it requires manual steps to upload, download, and deploy the packages. Deployment packages are ZIP or container image files that contain the function code and dependencies. The developer would have to store the packages in an S3 bucket, download them when needed, and use the AWS CLI or SDK to update the function code with the package. This would introduce more operational overhead than using a function alias.
  • Option D: Using AWS CodePipeline for deployments and rollbacks is not the best solution for deploying Lambda functions, as it requires setting up a continuous delivery pipeline that integrates with other AWS services. AWS CodePipeline is a service that automates the stages of software delivery, such as source code, build, test, and deploy. The developer would have to create a pipeline that uses AWS CodeCommit, AWS CodeBuild, AWS CodeDeploy, and other services to deploy and rollback Lambda functions. This would introduce more complexity and cost than using a function alias.

Therefore, option B is the best answer for this question.

The latest AWS Certified Developer – Associate DVA-C02 certification actual real practice exam question and answer (Q&A) dumps are available free, which are helpful for you to pass the AWS Certified Developer – Associate DVA-C02 exam and earn AWS Certified Developer – Associate DVA-C02 certification.

AWS Certified Developer - Associate DVA-C02 Exam Questions and Answers

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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