Kubernetes: How to Make Deployment to Update Image

Introduction

Updating the container image in a Kubernetes Deployment is a common task during application updates. In this guide, you'll learn how to use kubectl commands to update the image efficiently.

Prerequisites

Before proceeding, make sure:

• You have kubectl installed and configured.
• You have access to the Kubernetes cluster.

Updating the Image

Using kubectl set image

The kubectl set image command allows you to update the container image in a Deployment. Here's the syntax:

kubectl set image deployment/<deployment-name> <container-name>=<new-image>

Example

Suppose you have a Deployment named example-deployment with a container named example-container. To update the image to nginx:latest, run:

kubectl set image deployment/example-deployment example-container=nginx:latest

This updates the container image to nginx:latest.

Verify the Update

To verify the update, use:

kubectl rollout status deployment/<deployment-name>

Replace <deployment-name> with the name of your Deployment.

Rollback Changes

If the update causes issues, rollback to the previous version using:

kubectl rollout undo deployment/<deployment-name>

Best Practices

• Use Tags: Use versioned tags for images to avoid unexpected updates.
• Monitor Rollouts: Use kubectl rollout status to monitor updates.
• Test Updates: Verify updates in a staging environment before deploying to production.

Conclusion

Updating the container image in a Kubernetes Deployment is straightforward with kubectl set image. By following these steps, you can ensure smooth and reliable application updates.