What aspect does Blue Green Deployment ensure during the deployment process?

In the context of deployment strategies, Blue Green Deployment is primarily aimed at risk reduction by allowing software to be tested in a production-like environment without affecting the live operational environment. This approach involves maintaining two separate environments, one that is live (Blue) and one that is a clone (Green).

When a new version of an application is ready to be deployed, it is first pushed to the Green environment, where it can be tested and validated without impacting the users who are still accessing the Blue environment. This isolation ensures that any potential issues can be identified and resolved in the Green environment before switching traffic over to it. Once confidence is gained that the Green environment is functioning correctly, traffic is redirected from Blue to Green, making the new version live. This method significantly minimizes the risk of downtime or deployment failures because it provides a clear rollback option; if something goes wrong, traffic can quickly be rolled back to the stable version in the Blue environment.

In summary, Blue Green Deployment is focused on testing new applications in isolation to reduce risk, making it a robust strategy for managing deployments.