Handling upgrades of a 3-node k3s cluster (schedulable controlplan nodes) in combination with kured?

[kastl-ars]

Hi all,

I have been using system-upgrade-controller on all of my single-node machines for the past year and found it to be a really nice way to not have to do manual ugprades.

I would like to put it to work on my 3-node "production" cluster, which is running k3s as both controlplane and worker on each node. In other words, the nodes are controlplane nodes and are schedulable.

I have kured running to reboot the nodes one after the other when upgrading the OS (openSUSE MicroOS in my case), which works quite nicely.

Question

1. Can I hook up system-upgrade-controller and kured to only have one combined downtime?
2. If this is not possible, how to I make sure that they do not interfere with each other? I want to avoid kured rebooting a node while system-upgrade-controller restarts k3s on another one.

Has anyone done something like this and can share experiences?

Kind Regards
Johannes