How to join or remove worker nodes from a bare metal Kubernetes cluster.

Contents

Worker Node Join

Create Token

Kubernetes only stores tokens for 24 hours after the initial cluster creation, so you need to create a new one. You can create a new token with the command and check the join command line.

Check token list

$ kubeadm token list

Create Token

$ kubeadm token create --print-join-command

# Output example.
kubeadm join 192.168.0.181:6443 --token pqsjwz.rfctb36i8asph9ec --discovery-token-ca-cert-hash sha256:7ff4e184e95834b535b61c9ff7a87c28e1805145ba0376c35a0dee4d8f0f1d7f

Remove Worker Node from Kubernetes cluster.

$ kubectl drain k8s-gpu --ignore-daemonsets --delete-emptydir-data

$ kubectl delete no k8s-gpu