AWS Certified DevOps Engineer – Professional — Question 79

A DevOps engineer is building a continuous deployment pipeline for a serverless application that uses AWS Lambda functions. The company wants to reduce the customer impact of an unsuccessful deployment. The company also wants to monitor for issues.

Which deploy stage configuration will meet these requirements?

Answer options

• A. Use an AWS Serverless Application Model (AWS SAM) template to define the serverless application. Use AWS CodeDeploy to deploy the Lambda functions with the Canary10Percent15Minutes Deployment Preference Type. Use Amazon CloudWatch alarms to monitor the health of the functions.
• B. Use AWS CloudFormation to publish a new stack update, and include Amazon CloudWatch alarms on all resources. Set up an AWS CodePipeline approval action for a developer to verify and approve the AWS CloudFormation change set.
• C. Use AWS CloudFormation to publish a new version on every stack update, and include Amazon CloudWatch alarms on all resources. Use the RoutingConfig property of the AWS:: Lambda:: Alias resource to update the traffic routing during the stack update.
• D. Use AWS CodeBuild to add sample event payloads for testing to the Lambda functions. Publish a new version of the functions, and include Amazon CloudWatch alarms. Update the production alias to point to the new version. Configure rollbacks to occur when an alarm is in the ALARM state.

Correct answer: A

Explanation

Option A is correct because it uses AWS CodeDeploy with a canary deployment strategy, allowing for reduced customer impact during an unsuccessful deployment while also enabling monitoring through CloudWatch alarms. Option B does not include a deployment strategy that minimizes customer impact. Option C focuses on versioning and routing but lacks an effective deployment method like canary. Option D mentions rollbacks but doesn’t incorporate a strategy to minimize customer impact during deployment.