Manually Upgrading Longhorn Engine
In this section, you’ll learn how to manually upgrade the Longhorn Engine from the Longhorn UI.
Always make backups before upgrading the Longhorn engine images.
Upgrade the Longhorn manager before upgrading the Longhorn engine.
Follow these steps if the live upgrade is not available, or if the volume is stuck in degraded state:
Live upgrade is supported for upgrading from v1.4.x (< v1.4.2) or v1.3.x to v1.4.2.
iSCSI frontend does not support live upgrades.
Live upgrade should only be done with healthy volumes.
Upgrade Enginein the drop down.
During the live upgrade, the user will see double number of the replicas temporarily. After upgrade complete, the user should see the same number of the replicas as before, and the
Engine Image field of the volume should be updated.
Notice after the live upgrade, Rancher or Kubernetes would still show the old version of image for the engine, and new version for the replicas. It’s expected. The upgrade is success if you see the new version of image listed as the volume image in the Volume Detail page.
After you’ve done upgrade for all the images, select
Settings/Engine Image from Longhorn UI. Now you should able to remove the non-default image.
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