tl;dr - stream-of-consciousness notes as I stumbled through upgrading a k0s cluster from single-node to HA control plane. You probably shouldn’t attempt to do this though, just make a new HA-from-day-one cluster and move your workloads over. Recently I went through the somewhat traumatic experience of upgrading a k0s Kubernetes cluster from a single master (I was running 1 controller+worker node with other worker-only nodes) to a group of HA controller-only nodes with the same set of workers.
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