Why it matters

Blue-green enables instant LLM rollback. Understanding shapes practice.

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The architecture

Blue = current.

Green = new.

Validate green.

Switch traffic.

Blue-green flowBlue (current)prodGreen (new)validateSwitch trafficinstant cutoverInstant rollback benefit; 2x infra cost during transition
Blue-green.
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How it works end to end

Duplicate infra during transition.

Router or DNS switch.

Warm green before switch.

Instant rollback via switch back.