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Yes, ideally a loadbalancer, but in a sandbox/test env. without a LB it just has to be one of the other controlplane nodes (which is up)

So that address is only used during cluster joining I take it?...

correct, only used during join. It can be a DNS alias that points at the servers, load-balancer, whatever makes the most sense to you. You can also just point it at one of the servers, as long as you’re OK with having to change it if that server is ever down when you want to add more nodes.

Thanks for clarification. Yeah, that way it makes sense. Very nice.