join new worker nodes to existing k8s cluster

Creating a New Token

1. Using the kubeadm command, list your current tokens on the Master node. If your cluster was initialized over 24-hour ago, the list will likely be empty, since a token’s lifespan is only 24-hours.

kubeadm token list

2. Create a new token using kubeadm. By using the –print-join-command argument kubeadm will output the token and SHA hash required to securely communicate with the master.

kubeadm token create --print-join-command

output will be similar like below

kubeadm join 192.168.92.241:6443 --token ssojq6.apl37fzj84v7wzo2 --discovery-token-ca-cert-hash sha256:7270b4d84d2110290f71ee0e8d2201c4bd594e9ffa13e0f6cf129b2286513d30

3. Use kubeadm to list all tokens in order to verify our new one.

kubeadm token list

output will be similar like below

Joining the New Worker to the Cluster

1. Using SSH, log onto the new worker node.

2. Use the kubeadm join command with our new token to join the node to our cluster.

kubeadm join 192.168.92.241:6443 --token ssojq6.apl37fzj84v7wzo2 --discovery-token-ca-cert-hash sha256:7270b4d84d2110290f71ee0e8d2201c4bd594e9ffa13e0f6cf129b2286513d30

3. login to master node and check the worker node is successfully joned or not.

kubectl get nodes -owide

delete the token

1. List the token first.

kubeadm token list

output will be similar like below

2. Delete the token that you wish

kubeadm token delete lk3v5v.wdzpx0yonqseocoz

click here for link

@yannainglin