What is Blue-Green Deployment Technique?

Blue-green deployment is a technique that reduces downtime and risk by running two identical production environments called Blue and Green. At any time, only one of the environments is live, with the live environment serving all production traffic while the other is idle.

As you prepare a new version of your software, deployment and the final stage of testing takes place in an environment that is not LIVE (GREEN). Once you have deployed and fully tested the software in non-live (GREEN), you switch the router so all incoming requests now go to Green instead of Blue (earlier LIVE). Green is now live, and Blue is idle.

This technique can eliminate downtime due to application deployment. In addition, blue-green deployment reduces risk: if something unexpected happens with your new version on Green, you can immediately roll back to the last version by switching back to Blue.

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