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DevOps & Automation · Intermediate

Blue-Green Deployment

A release strategy using two identical production environments, switching all traffic from the current (blue) to the new (green) version at once.

Definition

Green is deployed and tested while blue serves traffic; a router, load balancer, or DNS change then cuts over. Rollback is fast because blue remains available. It requires double capacity during the switch and careful handling of database changes.

Example

Swap Azure App Service deployment slots to move traffic from staging (green) to production.

Exam tip

Fastest rollback with zero downtime is the hallmark of blue-green; cost is duplicate infrastructure.

Don't confuse it with

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