AWS Certified DevOps Engineer – Professional — Question 17

A DevOps Engineer manages a web application that runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The instances run in an EC2
Auto Scaling group across multiple Availability Zones. The engineer needs to implement a deployment strategy that:
✑ Launches a second fleet of instances with the same capacity as the original fleet.
✑ Maintains the original fleet unchanged while the second fleet is launched.
✑ Transitions traffic to the second fleet when the second fleet is fully deployed.
✑ Terminates the original fleet automatically 1 hour after transition.
Which solution will satisfy these requirements?

Answer options

• A. Use an AWS CloudFormation template with a retention policy for the ALB set to 1 hour. Update the Amazon Route 53 record to reflect the new ALB.
• B. Use two AWS Elastic Beanstalk environments to perform a blue/green deployment from the original environment to the new one. Create an application version lifecycle policy to terminate the original environment in 1 hour.
• C. Use AWS CodeDeploy with a deployment group configured with a blue/green deployment configuration. Select the option Terminate the original instances in the deployment group with a waiting period of 1 hour.
• D. Use AWS Elastic Beanstalk with the configuration set to Immutable. Create an .ebextension using the Resources key that sets the deletion policy of the ALB to 1 hour, and deploy the application.

Correct answer: C

Explanation

Option C is correct because AWS CodeDeploy allows for blue/green deployments and can be configured to terminate the original instances after a specified waiting period, which meets all the requirements. Option A does not address the traffic transition process correctly, while Option B uses Elastic Beanstalk, which is not necessary for this scenario. Option D also does not align with the requirements as it does not manage instance termination in the same effective manner as CodeDeploy.