DevOps Intermediate

What is Blue-Green Deployment?

A deployment strategy using two identical environments where traffic is switched from the old version to the new one instantly.

Blue-green deployment maintains two identical production environments. "Blue" runs the current version while "Green" receives the new deployment. After testing Green, traffic is switched from Blue to Green. If issues arise, instant rollback switches back to Blue.

This eliminates downtime during deployments and reduces risk. Challenges include database migrations (both versions must be compatible), double infrastructure costs, and session management during the switch.

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