Applicable versions

Longhorn version < v1.3.0.

Symptoms

• When upgrading Longhorn system via helm or Rancher App, the modified Longhorn default settings doesn’t persist.

• When modifying the default settings via kubectl -n longhorn-system edit configmap longhorn-default-setting, the modification won’t be applied to the Longhorn system.

Background

This default setting is only for a Longhorn system that hasn’t been deployed. It has no impact on an existing Longhorn system.

Solution

We recommend using the Longhorn UI to change Longhorn setting on the existing cluster.

You can also use the kubectl, but please be aware this will bypass Longhorn backend validation.

kubectl edit settings <SETTING-NAME> -n longhorn-system