Cluster init
Init first control-plane
Join other control-plane nodes
curl -sfL https://get.k3s.io | K3S_TOKEN=<token> sh -s - server \
--server https://<existing-server-name>:6443 \
--disable servicelb --tls-san <new-node-name>.lupinedmz
Join agent/worker nodes
install nfs-common
sudo apt install nfs-common
taint master nodes NoSchedule
kubectl taint nodes <master-node-name> node-role.kubernetes.io/control-plane=:NoSchedule