Kubernetes Cookbook - Second Edition

Adding nodes in a HA cluster

Once the masters are ready, you can add nodes into the system. This node should be finished with the prerequisite configuration as a worker node in the kubeadm cluster. And, in the beginning, you should start kubelet as the master ones:

// now you're in the second master$ sudo systemctl enable kubelet && sudo systemctl start kubelet

After that, you can go ahead and push the join command you copied. However, please change the master IP to the load balancer one:

// your join command should look similar to following one$ sudo kubeadm join --token <CUSTOM_TOKEN> <LOAD_BALANCER_IP>:6443 --discovery-token-ca-cert-hash sha256:<HEX_STRING>

You can then jump to the first master or second master to check the nodes' status: ...