Google Professional Cloud Network Engineer Question 446
Single answerGoogle Cloud PlatformYour company has an e-commerce platform deployed on Google Cloud, and you need to gradually roll out a new version of your application to test its performance before a full deployment. You are using an Application Load Balancer (ALB) to manage traffic. How can you configure the ALB to achieve this using Google Cloud Console?
- A
Configure a traffic splitting rule in the URL map to route a percentage of traffic to the new version's backend service.
- B
Enable traffic mirroring in the ALB to send a copy of every request to the new version's backend service.
- C
Use a preconfigured URL rewrite rule to ensure all traffic is routed to the new version's backend service.
- D
Set up a health check for the new version's backend service and route traffic only if the health check passes.
Show answer and explanation
Correct answer: A
Explanation
To gradually roll out a new application version using an Application Load Balancer, the most effective method is to use traffic splitting in the URL map. This feature enables you to direct a specific percentage of traffic to different backend services, allowing you to test the new version without affecting all users. Other options, such as traffic mirroring or health checks, serve different purposes and are not suitable for this scenario.
- A. Correct.
This is the correct approach. Traffic splitting rules in the URL map allow you to route a specific percentage of traffic to different backend services, which is ideal for gradual rollouts.
- B. Incorrect.
Traffic mirroring is used to duplicate requests for testing or debugging purposes, but it does not allow gradual traffic rollouts. Instead, it sends a copy of each request to the mirrored backend.
- C. Incorrect.
URL rewrite rules are used to modify the URL path or host before the request is sent to the backend, but they are not designed for traffic splitting or gradual rollouts.
- D. Incorrect.
Health checks ensure the availability of backend services but do not handle traffic splitting or gradual rollouts. They are complementary to traffic management, not a solution for it.