Blue-Green Deployments: Instant Rollbacks & Zero Downtime (opens in new tab)

A blue-green deployment is a release strategy where you maintain two identical production environments. Only one serves live traffic at a time. When releasing new software, you deploy to the idle environment, test it, and then switch the traffic router. If the release fails, you can instantly roll back by routing traffic back to the original environment. Deploying new code to a live system is inherently risky. When I explain standard deployments to other engineers, I ask them to think about t...