Kubeadm - join to cluster

   
 kubernetes  
 sysadmin  
Table of Content

Preface

Main idea: Join Cluster (If you have multi node service)

Prerequisite

  • kubelet (tools to run kubeadm)
  • kubernetes multi node cluster

Join a cluster in multi node service

I want to join the node so, first check kubelet with systemctl status kubelet. It should running.

At Master node, I can generate token first

$ kubeadm token generate
y1wd9w.6458v0ag5l2l1t6m

And generate node join command

$ kubeadm token create y1wd9w.6458v0ag5l2l1t6m
W1126 22:54:10.911297   87533 configset.go:348] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
y1wd9w.6458v0ag5l2l1t6m

At Worker node, I can join with the generated token from Master node

kubeadm join 192.168.39.153:8443 --token hp9b0k.1g9tqz8vkf78ucwf --discovery-token-ca-cert-hash

Reference