Deploy a HA K3S cluster with etcd using k3sup

For the first master node execute:

k3sup install --ip <first master ip> --user <server user> --cluster --ssh-key <ssh keys> --k3s-version <k3s version> --k3s-extra-args '--disable=servicelb'

For the following master nodes execute:

k3sup join --ip <next master ip> --user <server user> --server-user <first master server user> --server-ip <first master ip> --server --ssh-key <ssh keys> --k3s-version <k3s version> --k3s-extra-args '--disable=servicelb'

source: https://github.com/alexellis/k3sup/blob/master/README.md