What deployment strategy eliminates downtime by running two identical production environments?

The blue-green deployment strategy is designed to eliminate downtime by maintaining two identical production environments, referred to as the "blue" environment and the "green" environment. In this model, one environment is live and serving all user traffic while the other environment is idle but fully provisioned and updated with the new version of the application or service.

When it's time to deploy the new version, the updated environment is thoroughly tested to ensure it functions as expected without impacting the live environment. After the testing phase, traffic is switched from the live environment to the updated one. This switch can happen rapidly, resulting in minimal to no downtime for users. If issues arise after the switch, it's straightforward to roll back to the previous environment, ensuring high availability and reliability.

By utilizing two separate but identical environments, blue-green deployment enables seamless transitions between application versions and coordinates updates more effectively without service interruptions.