kubernetes-patterns-blue-green-deployments

Contents

Roadmap info from roadmap website

Blue Green Deployments

It is a deployment strategy used in Kubernetes for deploying new versions of an application by running two identical production environments, one with the current version (blue) and the other with the new version (green). After the green environment is fully tested, traffic is routed from the blue environment to the green environment, providing a seamless transition for users and avoiding any downtime or disruption. In Kubernetes, Blue-Green Deployments can be implemented using a variety of tools and techniques, including deployment strategies, traffic routing, and load balancing.

Resources

• @article@Create a Kubernetes Blue Green Deployment
• @video@Kubernetes - Blue/Green Deployments

Blue-Green Deployment strategy

flowchart TD
    subgraph Blue-Green Deployment
        direction TB
        A[Users] -->|Initial Traffic| B[Blue Environment - Current Version]
        B --> C[(Load Balancer)]
        A -->|Switch Traffic| D[Green Environment - New Version]
        D --> C

        subgraph Steps
            B -->|Deployment New Version| D
            D -->|Test New Version| C[(Load Balancer)]
        end
    end

Key Elements

• Users: Initially directed to the blue environment (current version).
• Blue Environment: Running the current version of the application.
• Green Environment: Holds the new version and is tested thoroughly before switching traffic.
• Load Balancer: Handles the transition from the blue environment to the green environment.

This approach ensures that no downtime occurs during deployment as traffic is seamlessly routed from the blue to the green environment after successful testing.