Upgrading and rolling back releases in Kubernetes - Mini Project: Build & Apply

Upgrading and Rolling Back Releases in Kubernetes

📖 Scenario: You are managing a simple web application deployed on Kubernetes. You need to upgrade the application to a new version and then learn how to roll back to the previous version if something goes wrong.

🎯 Goal: Learn how to upgrade a Kubernetes deployment to a new version and roll back to the previous version using kubectl commands.

📋 What You'll Learn

A Kubernetes cluster with kubectl configured

A deployment named webapp running version v1

Basic knowledge of kubectl commands

💡 Why This Matters

🌍 Real World

In real projects, upgrading applications without downtime and rolling back quickly if issues occur is critical for smooth user experience.

💼 Career

DevOps engineers and site reliability engineers often manage application deployments and need to perform upgrades and rollbacks safely.

1

Create the initial deployment

Create a deployment named webapp with image nginx:1.19 using the command kubectl create deployment webapp --image=nginx:1.19.

Kubernetes

# Run the command to create the deployment
# Your code here

Need a hint?

Use kubectl create deployment with the exact name webapp and image nginx:1.19.

2

Upgrade the deployment to a new version

Use the command kubectl set image deployment/webapp webapp=nginx:1.21 to upgrade the webapp deployment's container image to nginx:1.21.

Kubernetes

kubectl create deployment webapp --image=nginx:1.19
# Upgrade the deployment image to nginx:1.21
# Your code here

Need a hint?

Use kubectl set image with deployment name webapp and container name webapp to set the image to nginx:1.21.

3

Roll back the deployment to the previous version

Use the command kubectl rollout undo deployment/webapp to roll back the webapp deployment to the previous version.

Kubernetes

kubectl create deployment webapp --image=nginx:1.19
kubectl set image deployment/webapp webapp=nginx:1.21
# Roll back the deployment to the previous version
# Your code here

Need a hint?

Use kubectl rollout undo with the deployment name webapp to roll back.

4

Check the rollout status

Use the command kubectl rollout status deployment/webapp to check the status of the deployment rollout.

Kubernetes

kubectl create deployment webapp --image=nginx:1.19
kubectl set image deployment/webapp webapp=nginx:1.21
kubectl rollout undo deployment/webapp
# Check the rollout status
# Your code here

Need a hint?

Use kubectl rollout status deployment/webapp to see if the deployment is successful.