Kubernetes - Rolling Updates and Rollbacks

Introduction:

• Updates and rollbacks refer to changes made to the application or its configuration that are running on the cluster.

1. Updates:
   • An update is a process of deploying a new version of your application.
   • With Rolling Updates, Kubernetes incrementally updates Pods instances with new ones. The update is done in such a way that no downtime is experienced.

    kubectl set image deployment/my-deployment my-container=my-image:1.2.3
   

2. Rollbacks
   • A rollback is the operation of returning to a previous deployment version in case the new version of application is causing issues.
   • Kubernetes keeps track of the changes made to the Deployment and allows you to rollback to a previous revision using the kubectl rollout undo command.

    kubectl rollout undo deployment/my-deployment