In blue-green deployment, what is the key action after testing the new environment is satisfactory?

In blue-green deployment, what is the key action after testing the new environment is satisfactory?

• A. Keep traffic on the old environment
• B. Split traffic evenly between environments
• C. Roll back and retry on old environment
• D. Switch traffic to the new environment

Answer: (C)

After the new environment passes testing, the next step is to switch all user traffic to the new environment. This is done by updating the routing layer (load balancer or DNS) to point production to the new deployment, enabling a quick cutover with minimal downtime. The old environment remains available as a rollback option if any issues arise after the switch. Keeping traffic on the old environment or splitting traffic would be used in other deployment approaches, not the final handoff in blue-green.

After the new environment passes testing, the next step is to switch all user traffic to the new environment. This is done by updating the routing layer (load balancer or DNS) to point production to the new deployment, enabling a quick cutover with minimal downtime. The old environment remains available as a rollback option if any issues arise after the switch. Keeping traffic on the old environment or splitting traffic would be used in other deployment approaches, not the final handoff in blue-green.