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README.md

Rollback a Kubernetes Deployment

This readme file provides step-by-step instructions on how to deploy and manage the Nginx web server using Kubernetes Deployment. It also covers the process of rolling back to previous revisions if necessary.

Deployment Creation

To deploy the Nginx web server, follow these steps:

  • Create a file named nginx-deployment.yaml:
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    run: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      run: nginx
  template:
    metadata:
      labels:
        run: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
  • Run the following command to deploy the Nginx server using the nginx-deployment.yaml file:
kubectl apply -f nginx-deployment.yaml --record=true

Checking Deployment Status

To verify the deployment status, execute the following command:

kubectl get deployment

The output will display information about the deployed Nginx server, including the number of replicas.

Upgrading the Deployment Image

If you need to upgrade the Nginx image in the deployment, follow these steps:

  • Run the following command to update the image to nginx:1.16.1:
kubectl set image deployment/nginx-deployment nginx=nginx:1.16.1 --record=true
  • To check the rollout status, use the following command:
kubectl rollout status deployment/nginx-deployment

Rolling Back a Deployment

In case an upgrade causes issues and you need to roll back to a previous version, follow these steps:

  • Use the command below to view the revision history of the deployment:
kubectl rollout history deployment/nginx-deployment
  • To see the details of a specific revision (e.g., revision 2), run the following command:
kubectl rollout history deployment/nginx-deployment --revision=2
  • To perform a general rollback to the previous revision, execute the command:
kubectl rollout undo deployment/nginx-deployment
  • If you want to rollback directly to a specific revision number (e.g., revision 1), use the following command:
kubectl rollout undo deployment/nginx-deployment --to-revision=1
  • To verify the rollback, you can describe the deployment using the command:
kubectl describe deployment nginx-deployment