4.5 Troubleshooting Issues PROFESSIONAL-CLOUD-DEVOPS-ENGINEER Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   Your CI/CD pipeline deploys a new version of a service to GKE. The deployment is successful, but immediately after the rollout, the service's error rate spikes. The pipeline's post-deployment validation step, which runs a simple HTTP health check, passed. You need to identify the root cause. The application logs are available in Cloud Logging. What is the most effective next step?

   • AReview the Cloud Build logs to ensure the container image was built correctly.
   • BRoll back the deployment to the previous version to restore service immediately.
   • CExamine the application logs in Cloud Logging for stack traces or exceptions that occurred after the deployment timestamp.
   • DCheck the GKE cluster's node metrics to see if the new deployment caused a resource shortage.
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2. 2application · medium

   A VM instance in your project has become unreachable via SSH. You can see the instance is 'Running' in the console. You suspect a network issue. Which sequence of steps is the most systematic way to diagnose the problem?

   • ACheck the instance's serial console output, then verify the VPC firewall rules, and finally test connectivity from another VM in the same VPC.
   • BImmediately delete and recreate the VM to restore SSH access.
   • CCheck the IAM permissions for your user account to ensure you have the roles/compute.osAdminLogin role.
   • DVerify the instance's public IP address has not changed and that the DNS name resolves correctly.
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4. 3foundation · easy

   Which Google Cloud tool is most appropriate for viewing real-time logs from a Compute Engine VM to diagnose an infrastructure issue?

   • ACloud Logging
   • BCloud Trace
   • CCloud Monitoring
   • DCloud Debugger
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5. 4foundation · easy

   An application's performance degrades over time. Observability data shows a gradual increase in memory usage. Which action is most likely to resolve the issue?

   • AInvestigate the application code for memory leaks.
   • BIncrease the VM's CPU quota.
   • CRestart the application periodically.
   • DReduce the application's logging verbosity.
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6. 5application · medium

   A Cloud Build pipeline that builds a Docker image and pushes it to Artifact Registry is failing. The build step that runs 'docker build' fails with the error: 'failed to solve: failed to read dockerfile: open /workspace/Dockerfile: no such file or directory'. The repository is correctly connected, and the trigger fires. What is the most likely cause?

   • AThe Artifact Registry repository does not exist or the service account lacks permission to push to it.
   • BThe Docker build is failing because the base image specified in the Dockerfile is not accessible from the build environment.
   • CThe Cloud Build service account does not have permission to read from the source repository.
   • DThe Dockerfile is not present in the root of the source repository, or the 'Dockerfile' field in the build step is set to the wrong path.
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