Exam Professional Cloud DevOps Engineer topic 1 question 112 discussion

Actual exam question from Google's Professional Cloud DevOps Engineer

Question #: 112
Topic #: 1

[All Professional Cloud DevOps Engineer Questions]

You manage an application that runs in Google Kubernetes Engine (GKE) and uses the blue/green deployment methodology. Extracts of the Kubernetes manifests are shown below:

The Deployment app-green was updated to use the new version of the application. During post-deployment monitoring, you notice that the majority of user requests are failing. You did not observe this behavior in the testing environment. You need to mitigate the incident impact on users and enable the developers to troubleshoot the issue. What should you do?

A. Update the Deployment app-blue to use the new version of the application.
B. Update the Deployment app-green to use the previous version of the application.
C. Change the selector on the Service app-svc to app: my-app.
D. Change the selector on the Service app-svc to app: my-app, version: blue.

Show Suggested Answer

Suggested Answer: D 🗳️

by ReachTango73 at Oct. 12, 2023, 7:09 p.m.

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ReachTango73

Highly Voted 8 months, 1 week ago

Should be D

upvoted 8 times

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xhilmi

Most Recent 6 months, 1 week ago

Selected Answer: D

To mitigate the impact of the incident on users and facilitate troubleshooting, the recommended action is to change the selector on the Service app-svc to app: my-app, version: blue, as stated in (Option D). This adjustment allows the Service to route traffic specifically to the previous version of the application (app-blue). By changing the selector to include the version label, you effectively roll back the traffic to the working version, providing a quick and effective solution to address the user request failures observed after the update to app-green. This enables developers to investigate and troubleshoot the issue in a controlled manner without affecting user experience, and it serves as an interim solution while further investigation and remediation are carried out.

upvoted 4 times

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pharao89

7 months ago

Selected Answer: D

It's a simplified question from CKAD exam. Answer D is the correct one since you need to point the service at the blue deployment and leave the green deployment for future analysis for developers.

upvoted 4 times

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