Rolling back deployments is an essential capability in Kubernetes that allows you to revert to a previous version of your Java application. This can be incredibly useful in scenarios where you discover issues or unexpected behavior after a deployment.

In this blog post, we will walk you through the process of rolling back Java app deployments in Kubernetes.

Step 1: Check Deployment History

Before rolling back a deployment, it’s important to check the deployment history to identify the revision you want to roll back to. This can be done using the kubectl command-line tool with the following command:

kubectl rollout history deployment/<deployment-name>

This command will show you the revision history of the specified deployment.

Step 2: Rollback to Previous Revision

Once you have identified the revision you want to roll back to, you can use the kubectl command-line tool to initiate the rollback. The command syntax is as follows:

kubectl rollout undo deployment/<deployment-name> --to-revision=<revision-number>

Replace <deployment-name> with the name of your deployment and <revision-number> with the revision number you obtained from step 1.

Step 3: Verify Rollback

After initiating the rollback, it’s crucial to verify that the rollback was successful. You can use the kubectl command-line tool to check the status of the deployment:

kubectl rollout status deployment/<deployment-name>

This command will display the status of the deployment and whether it is successfully rolled back or not.

Conclusion

Rolling back Java app deployments in Kubernetes is a straightforward process that ensures you can quickly revert to a previous version of your application when needed. By following the steps outlined in this blog post, you can confidently handle deployment issues and maintain the stability of your Java applications.

#kubernetes #javadeployment