← Glossary
Blue-Green Deployment
Running two identical production environments and switching traffic between them, so a bad release can be reversed instantly.
A new version deploys to an idle 'green' environment while the current 'blue' one keeps serving all live traffic. Once the green environment is verified, traffic switches over — and if something's wrong, switching back to blue is immediate, rather than a rushed rollback under pressure. The tradeoff is running duplicate infrastructure, at least briefly, in exchange for that safety margin.
Where this shows up in practice
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