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A Cloud Guru

Rolling Updates with Kubernetes Deployments

Deployments provide powerful automation for application management in Kubernetes. One of the things deployments can do is to allow you to perform rolling updates. Rolling updates enable you to update your containers to new versions gradually, without incurring downtime. In this lab, you will have a chance to learn, hands-on, how to perform a rolling update, as well as a rollback to previous version.

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Path Info

Level

Intermediate

Duration

1h 0m

Published

Mar 31, 2019

Challenge

Perform a rolling update of the container version
Update the deployment to the new version like so:
```
kubectl set image deployment/candy-deployment candy-ws=linuxacademycontent/candy-service:3 --record
```
Check the progress of the rolling update:
```
kubectl rollout status deployment/candy-deployment
```
If the update is not finished after a few minutes, something may be wrong with the update.
Challenge

Roll back to the previous working state
In this scenario, the rolling update should fail. This is because the specified image, linuxacademycontent/candy-service:3, does not exist. Roll back to the previous version to get things working again.

Get a list of previous revisions.
```
kubectl rollout history deployment/candy-deployment
```
Undo the last revision.
```
kubectl rollout undo deployment/candy-deployment
```
Check the status of the rollout.
```
kubectl rollout status deployment/candy-deployment
```
This command should complete soon, saying the rollout was successful.

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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