Definition
Blue-Green Deployment
A deployment strategy that maintains two identical production environments, allowing instant rollback by switching traffic between them.
Blue-green deployment runs two identical production environments: 'blue' (current live) and 'green' (new version). You deploy the new version to the idle environment, verify it works, then switch the load balancer to route traffic to it. If something goes wrong, you switch back instantly — no downtime, no partial rollouts, no prayer-based deployments. This strategy eliminates the 'deploy and hope' pattern common in startups and vibecoded projects. Blue-green deployments require containerized infrastructure and infrastructure as code, but the investment pays for itself the first time a deployment needs to be rolled back in seconds instead of hours.
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