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I'm not sure what you mean by n-2. The channels are what's listed there - latest, stable, and one for each Kubernetes minor.

Ah. Cool I didn’t know about the channel feature yet. I can’t fully automate this because it rotates my rook-ceph nodes too quickly. Somehow it would be nice to have it wait until some command (eg ceph status) returns something (health-ok). Is that possible?

you can write a plan to do whatever you want

ah jeah right, the “prepare” step could be used for that. but the “default” https://github.com/rancher/system-upgrade-controller/blob/master/examples/k3s-upgrade.yaml#L42-L45 which does https://github.com/k3s-io/k3s-upgrade/blob/master/scripts/upgrade.sh#L65-L89 is also useful… so I would have to bake some own k3s-upgrade image which additionally does some checks there. But well, maybe some time in the future 😄

I don’t think so, I bet you can get everything you need out of the existing image with some tweaks to the plan

hmmmm, I don’t really see how to easily add additional behaviour instead of replacing it. The

Prepare

(upgrade.cattle.io/v1/types.go#L44) is just one container which has to do all the logic. if it would be a list of contains like initContainers which all have to terminate before the upgrade starts… easy 😄 but adding “wait for ceph health to be OK” without replacing the whole logic about the “k3s-upgrade/prepare” with checking if the master plan exists and versions match… no idea yet.