Which statement accurately contrasts blue/green deployment with canary deployment?

Which statement accurately contrasts blue/green deployment with canary deployment?

• A. Blue/Green deploys to two identical environments with instant switch; Canary gradually exposes subset.
• B. Canary deploys to two identical environments and Blue/Green uses a subset first.
• C. Both migrate all users at once.
• D. Neither involves live production.

Answer: (A)

The main idea is how traffic is released to users in two different deployment approaches. Blue/Green keeps two identical production environments: you deploy the new version to the idle one and, after verification, switch all user traffic to it in one go. If something goes wrong, you can flip back to the previous environment almost instantly, making a quick rollback feasible. Canary deployment starts by exposing only a small subset of users or servers to the new version, monitoring for issues, and then gradually increasing the rollout until everyone eventually gets the update. This captures the key difference: blue/green uses an instant, full switch between two environments, while canary uses a staged, incremental exposure. The other ideas mix up the roles, claim everyone moves at once, or imply no live production involvement, which doesn’t align with how these strategies actually work.

The main idea is how traffic is released to users in two different deployment approaches. Blue/Green keeps two identical production environments: you deploy the new version to the idle one and, after verification, switch all user traffic to it in one go. If something goes wrong, you can flip back to the previous environment almost instantly, making a quick rollback feasible. Canary deployment starts by exposing only a small subset of users or servers to the new version, monitoring for issues, and then gradually increasing the rollout until everyone eventually gets the update. This captures the key difference: blue/green uses an instant, full switch between two environments, while canary uses a staged, incremental exposure. The other ideas mix up the roles, claim everyone moves at once, or imply no live production involvement, which doesn’t align with how these strategies actually work.