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AWS Certified DevOps Engineer - Professional

  • Topic 1 Question 293

    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 launch templates, Auto Scaling groups, and ALB target groups for the blue environment and the green environment. Each target group specifies which application version, blue or green, will be loaded on the EC2 instances. An Amazon Route 53 record for www.example.com points to the ALB.

    The deployment must shift traffic all at once from the blue environment to the green environment.

    Which solution will meet these requirements?

    • Starta rolling restart of the Auto Scaling group for the green environment to deploy the new application version to 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 environments target group. Start a rolling restart of the Auto Scaling group for the green environment to deploy the new application version to the green environment's EC2 instances.

    • Update the launch template to deploy the green environment's application version to the blue environment's EC2 instances. Do not change the target groups or the Auto Scaling groups in either environment. Perform a rolling restart of the blue environments EC2 instances.

    • Starta rolling restart of the Auto Scaling group for the green environment to deploy the new application version to the green environment's EC2 instances. When the rolling restart is complete, update Route 53 to point to the green environment's endpoint on the ALB.

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