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Execute Rolling Updates in Kubernetes.md

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Problem Statement

An application currently running on the Kubernetes cluster employs the nginx web server. The Nautilus application development team has introduced some recent changes that need deployment. They've crafted an image nginx:1.18 with the latest updates

Execute a rolling update for this application, integrating the nginx:1.18 image. The deployment is named nginx-deployment

Ensure all pods are operational post-update

To execute a rolling update for the nginx-deployment and integrate the new nginx:1.18 image, follow these steps:

Solution

1. Check the Current State

Verify the current state of the deployment and pods to understand what is running before making changes.

Check the pods:

kubectl get pods

You should see output similar to:

NAME                               READY   STATUS    RESTARTS   AGE
nginx-deployment-989f57c54-dnxjs   1/1     Running   0          53s
nginx-deployment-989f57c54-fjvdw   1/1     Running   0          53s
nginx-deployment-989f57c54-zsfs6   1/1     Running   0          53s

Check the deployment:

kubectl get deployments.apps

You should see output similar to:

NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3/3     3            3           61s

2. Verify Current Deployment Details

Ensure you know the current image being used and the update strategy:

kubectl describe deployments.apps nginx-deployment

Look for the image version and strategy type in the output. You might see something like:

Containers:
  nginx-container:
    Image:         nginx:1.16

3. Update the Image

Update the image from nginx:1.16 to nginx:1.18 using the kubectl set image command:

kubectl set image deployments/nginx-deployment nginx-container=nginx:1.18

The output will confirm the image update:

deployment.apps/nginx-deployment image updated

4. Monitor the Rollout Status

Ensure that the rolling update proceeds smoothly and completes successfully:

kubectl rollout status deployments/nginx-deployment

You should see:

deployment "nginx-deployment" successfully rolled out

5. Verify the Update

Finally, check the deployment to confirm that the new image nginx:1.18 is being used:

kubectl describe deployments.apps nginx-deployment

You should see the updated image in the output:

Containers:
  nginx-container:
    Image:         nginx:1.18

Summary

  • Initial Check: Verify the current pods and deployment status.
  • Verify Current Details: Check the existing image and deployment strategy.
  • Update Image: Use kubectl set image to update to the new image version.
  • Monitor Rollout: Ensure the rollout status indicates a successful update.
  • Final Verification: Confirm the new image is deployed correctly.

By following these steps, you'll successfully perform a rolling update of your nginx-deployment to use the updated nginx:1.18 image.