What should the DevOps engineer do to meet these requirements?

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A DevOps engineer needs to configure a blue/green deployment for an existing three-tier application.The application runs on Amazon EC2 instances and uses an Amazon RDS database.The EC2 instances run behind an Application Load Balancer (ALB) and are in an Auto Scaling group.The DevOps engineer has created a launch template and an Auto Scaling group for the blue environment.The DevOps engineer also has created a launch template and an Auto Scaling group for the green environment.Each Auto Scaling group deploys to a matching blue or green target group.The target group also specifies which software, blue or green, gets loaded on the EC2 instances.The ALB can be configured to send traffic to the blue environment’s target group or the green environment’s target group.An Amazon Route 53 record for www.example.com points to the ALB.The deployment must move traffic all at once between the software on the blue environment’s EC2 instances to the newly deployed software on the green environment’s EC2 instances.

What should the DevOps engineer do to meet these requirements?

Start a rolling restart of the Auto Scaling group for the green environment to deploy the new software on the green environment’s EC2 instances. When the rolling restart is complete, use an AWS CLI command to update the ALB to send traffic to the green environment’s target group.

Use an AWS CLI command to update the ALB to send traffic to the green environment’s target group. Then start a rolling restart of the Auto Scaling group for the green environment to deploy the new software on the green environment’s EC2 instances.

Update the launch template to deploy the green environment’s software on the blue environment’s EC2 instances. Keep the target groups and Auto Scaling groups unchanged in both environments. Perform a rolling restart of the blue environment’s EC2 instances.

Start a rolling restart of the Auto Scaling group for the green environment to deploy the new software on the green environment’s EC2 instances. When the rolling restart is complete, update the Route 53 DNS to point to the green environment’s endpoint on the ALB.

2025-10-06

1 Comment

  1. Janet
    Author

    I believe the answer is:
    Start a rolling restart of the Auto Scaling group for the green environment to deploy the new software on the green environment’s EC2 instances. When the rolling restart is complete, use an AWS CLI command to update the ALB to send traffic to the green environment’s target group.

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