This strategy is best to avoid API Versioning Issues!
A Blue-Green deployment in Kubernetes mandates two identical production environments: one is known as the BLUE(Production) environment and the other one is the Green(Staging) environment. The blue environment runs the current application version(old version) while the green environment runs the new application version(updated version).
While implementing blue/green deployment in Kubernetes, version 2 (green) is deployed alongside version 1 (blue) with exactly the same amount of instances. Once the testing on the green environment gets completed, live application traffic is directed to the green environment and the blue environment is put on standby.
The major advantages of adopting a blue-green deployment in Kubernetes include,
- It is a simple and easy-to-implement deployment strategy.
- It eliminates the risk of downtime as compared to big-bang deployments where services would go offline before the new version was launched.
- Rollback is straightforward and can be executed simply and fastly.
- If there is an issue, the traffic can easily be flipped back to the old environment which makes implementing Blue-green deployment in Kubernetes less risky when compared to other deployment strategies.