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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

Clock icon Intermediate
Clock icon 1h 0m
Clock icon Mar 31, 2019

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Table of Contents

  1. 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.

  2. 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.

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