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You can add a taint flag to the installation script for the control plain nodes. https://docs.k3s.io/cli/server

What should i set it to? sorry still learning here haha

Good question. That's where the documentation sucks because it is never gives specific examples. The only thing I see in the docs is this: https://docs.k3s.io/advanced#node-labels-and-taints. You'll probably want to create a test VM cluster with k3s and experiment until you find the right option.

I did find this:

--node-taint CriticalAddonsOnly=true:NoExecute

in the external db docs https://docs.k3s.io/datastore/ha

That's a good place to start experimenting!

actually i just found this, TechnoTim put together an ansible playbook for building an HA etcd cluster and has the taint in it https://github.com/search?q=repo%3Atechno-tim%2Fk3s-ansible%20taint&type=code

You can taint it with whatever you want. If you want some things to run on the tainted nodes, those things must have a matching toleration. That's all there is to it.

ahhhh cool thanks!