Why it matters

Blue-green enables safe deploys. Understanding shapes zero-downtime strategy.

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The architecture

Blue env: currently serving traffic.

Green env: new version, ready.

Router: switch traffic.

Blue-green flowBlue (current)serving trafficGreen (new)warm, testedRouter switchtraffic to greenRollback: switch back to blue instantly if issues
Deployment cycle.
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How it works end to end

Cost: 2x resources during switchover.

State: careful with stateful agents; session store shared.

Validation: automated tests before switch.

Rollback: switch back within minutes.