Why it matters

Blue/green enables zero-downtime deploys with instant rollback. Common in enterprise.

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The architecture

Deploy to green env.

Test; cut over traffic.

Keep blue for rollback.

Agent blue/green deployDeploy greennew versionCut overtraffic switchesRollbackblue still aliveZero-downtime deploy; higher cost (2x env) but simple rollback
Agent blue/green deploy.
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How it works end to end

2x env cost during switch.

Simple cut over.

Instant rollback.