How do I implement blue/green deployments for Kubernetes architecture?

Implementing blue/green deployments in a Kubernetes architecture allows for seamless updates with minimal downtime. This strategy involves maintaining two separate environments: one for the current version (blue) and another for the new version (green). Here's a step-by-step guide on how to implement this:

Step-by-Step Guide

  1. Create two identical environments (blue and green).
  2. Deploy the new application version to the green environment.
  3. Test the green environment to ensure it works correctly.
  4. Switch the traffic from the blue environment to the green using a service update.
  5. Monitor the green environment for any issues.
  6. If everything is running smoothly, you can turn down the blue environment.

Example Deployment Configuration

apiVersion: apps/v1 kind: Deployment metadata: name: myapp-blue spec: replicas: 3 selector: matchLabels: app: myapp version: blue template: metadata: labels: app: myapp version: blue spec: containers: - name: myapp image: myapp:blue ports: - containerPort: 80 --- apiVersion: apps/v1 kind: Deployment metadata: name: myapp-green spec: replicas: 3 selector: matchLabels: app: myapp version: green template: metadata: labels: app: myapp version: green spec: containers: - name: myapp image: myapp:green ports: - containerPort: 80

blue/green deployments Kubernetes DevOps continuous deployment application updates rolling updates

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