Free Google Professional Cloud DevOps Actual Exam Questions - Question 3 Discussion
[Building and implementing CI/CD pipelines for a service] You recently deployed your application in Google Kubernetes Engine (GKE) and now need to release a new version of the application You need the ability to instantly roll back to the previous version of the application in case there are issues with the new version Which deployment model should you use?
It’s D for sure. Blue/green deployment means you have both environments ready to go, so if the new version messes up, you just flip the traffic back to the old one immediately. Rolling or canary deployments don't give that instant rollback because they gradually replace pods, which can take time and risk partial outages. Plus, the question highlights needing an instant rollback, and blue/green is designed exactly for that scenario. Even if it might cost more to run two environments briefly, it’s worth it when uptime and quick recovery are priorities.
C/D? Canary lets you test gradually but rollback isn’t instant since old pods get replaced. Blue/green keeps both live, so switching back is immediate if issues pop up.
D imo. Blue/green deployment basically keeps two separate environments—one with the old version and one with the new—so you can switch back instantly if something breaks. Rolling updates or canary deployments are safer but don’t give you that instant rollback option. A/B testing is more about user behavior than deployment safety.
D blue/green is best for instant rollback, rolling could delay fixes.