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To provision an HA RKE2 cluster through Rancher, you don't need to create a fixed registration address because Rancher takes care of that under the hood. However, the node roles work a little differently than they do in the RKE2 docs because in Rancher the etcd and controlplane roles are separated. So to get HA you would provision a cluster with 3 nodes with the etcd role and 2 or more nodes with the controlplane role. Alternatively, you could set up the HA cluster with a fixed registration address using the CLI as you normally would, then import it into Rancher.