Crucial Exams

GCP Professional Cloud Architect Practice Question

Your team operates a stateless Node.js microservice on Cloud Run, deployed as a single service in both us-central1 and europe-west1. You must implement a blue-green release process that meets the following goals: (1) the new version is live only after it is fully rolled out in both regions, (2) the cut-over and any rollback happen instantaneously without redeploying code, and (3) no additional infrastructure should be introduced. Which approach best satisfies these requirements?

  • Deploy the new code as a tagged revision in each regional Cloud Run service, route 0 % traffic to the tag for testing, then update the traffic split to 100 % for the tag in both regions; rollback by restoring the previous split.

  • Build the new image with Cloud Build and use Cloud Deploy to run a 10 %-90 % canary promotion across regions, then promote to 100 % when healthy; rollback by re-executing the pipeline.

  • Perform a rolling update of the existing revision in each region with the maximum-unavailable setting at zero so instances are replaced one by one; rollback by redeploying the previous image.

  • Create a separate Cloud Run service for the green version in every region and replace the back-end service of the existing HTTPS load balancer with the new services; rollback by editing the load balancer again.

GCP Professional Cloud Architect
Managing implementation
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