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You do rke2-server XOR rke2-agent service, not both. So if you're already running rke2-agent then don't start rke2-server. It's weird to have an even number of etcd nodes. I'm not sure that works.

Right! there should be odd number of nodes for etcd... https://docs.rke2.io/install/ha

probably it never worked but the rancher web interface did not show any error...