Exam Professional Cloud DevOps Engineer topic 1 question 117 discussion

The point of using blue/green deployment is to have both blue & green versions deployed, and we chose the active one at service level, so rollback should only consist of updating the service to serve the other version.

As seen in question 112, we can have blue & green deployments and just need to point the service to the correct deployment for rollback

To implement rollback actions in a blue/green deployment methodology for an application deployed on Google Kubernetes Engine (GKE), the recommended approach is (Option C). Updating the Kubernetes Service to point to the previous Kubernetes Deployment effectively rolls back the service to the previous version. This action ensures that traffic is directed to the previous deployment, mitigating any issues introduced by the new version. It is a controlled and Kubernetes-native way to perform rollbacks, allowing for seamless transitions between different versions of the application without downtime. Using the kubectl rollout undo command (option A) is another rollback method, but updating the Service provides a cleaner and more declarative approach within the Kubernetes environment.

A appears correct answer

Answer should be A