DevOps Interview DropBeginner TierConcept+10 XP on read
Compare blue-green, canary, and rolling deployments. When would you choose each?
#CI/CD#Deployment#Reliability
Core Summary
Rolling replaces instances gradually, blue-green switches all traffic between two full environments at once, and canary sends a small slice of real traffic to the new version while watching metrics. They differ mainly in rollback speed, cost, and how much confidence you gain before full exposure.
Hints
Hint 1: Ask what each strategy costs in infrastructure
Hint 2: Rollback speed is the real differentiator
Hint 3: Database schema changes constrain all three
Reported in interviews at Atlassian, Swiggy