How do I implement blue/green deployments for Continuous Integration?

Blue/green deployment is a powerful technique for achieving continuous integration and delivery, which minimizes downtime and reduces risks associated with software releases. By maintaining two production environments, 'blue' and 'green', you can seamlessly transition between application versions.

In a typical blue/green deployment flow, the current version of your application runs in the blue environment, while the new version is deployed to the green environment. Once the new version is tested and verified, you can switch traffic from blue to green, allowing for almost instantaneous updates.

Here’s an example implementation using a CI/CD pipeline:


        // Pseudo-code for blue/green deployment
        function deployToGreen() {
            $currentVersion = 'blue';
            $newVersion = 'green';

            // 1. Deploy new version to green environment
            deploy($newVersion);

            // 2. Test the new green environment
            if (test($newVersion)) {
                // 3. Switch traffic from blue to green
                switchTraffic($currentVersion, $newVersion);
                echo "Deployed green version successfully!";
            } else {
                echo "Deployment failed. Rolling back to blue version.";
            }
        }
        
        function deploy($version) {
            // Deployment logic here
        }

        function test($version) {
            // Testing logic here
            return true; // Simulating successful test
        }

        function switchTraffic($current, $new) {
            // Logic to switch traffic
        }

How do I implement blue/green deployments for Continuous Integration?

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How do I implement blue/green deployments for Continuous Integration?

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