Switching node to control-plane role.

[mprochowski]

Hi,
I have cluster (5xrpi - ubuntu 22.04) with 1 control-plane and 4 node, which I want to covert to multi control-plane environment. I was converted DB from sqlite to etcd, but I don't know how i should switch node to control-plane.

I'm thinking about two solutions:

1. Safely remove node from cluster (drain, cordon, etc.) and create new control-plane instance of it. - This is not preferred.
2. Somehow switch existing node instance to control-plane - maybe I could add server option to systemd start command?

What is the "right" scenario or what you suggest to switch node to control-plane?

[brandond]

Yes, all thats necessary from a K3s perspective is to change the startup command from k3s agent to k3s server. If you are comfortable renaming the systemd unit file, and modifying the contents, that is the simplest way to do this.

[mprochowski]

@brandond Thanks a lot, everything works perfectly.