Which deployment strategy is commonly used during post-migration validation to minimize risk by gradually shifting traffic to the new environment?

• A. Big-bang deployment
• B. Canary or blue/green deployments
• C. Snapshot deployment
• D. Shadow deployment

Answer: (B)

This approach centers on reducing risk by testing the new environment with real users while keeping the old setup available as a safety net. A canary deployment does this best: a small portion of traffic is directed to the new version, and you monitor performance, error rates, and user experience. If everything looks good, you gradually increase the fraction of traffic routed to the new environment until all users are on it. If problems arise, you can rollback with minimal impact.

Blue/green deployments fit too because you maintain two identical environments and switch traffic over once validation passes. In practice, some teams use weighted routing to shift traffic gradually between the two, which aligns with the same risk-minimizing goal. Taken together, these strategies are commonly used during post-migration validation to minimize risk by gradually shifting traffic to the new environment.