Blue-Green Deployment

Summary

A release strategy running two identical production environments (blue and green) — deploying to the idle one, then switching traffic over instantly, enabling zero-downtime releases and instant rollback.

• 1Diagram how traffic switches from the old to new environment in blue-green.
• 2Learn why this strategy makes rollback nearly instant compared to redeploying an old version.
• 3Understand the cost trade-off: you need double the infrastructure running briefly.