Establish Master Node

1. Initialize the master

   sudo kubeadm init --pod-network-cidr=10.244.0.0/16
   

   Since we will build a pod network later, we need to set up our pod network CIDR first. Here we take 10.244.0.0/16 as an example, you can modify the pod network.

2. Make kubectl work on your non-root user

   mkdir -p $HOME/.kube
   sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
   sudo chown $(id -u):$(id -g) $HOME/.kube/config
   

   The above commands are also displayed in the output of kubeadm init

   Alternatively, if you are the root user

   export KUBECONFIG=/etc/kubernetes/admin.conf
   

3. Install a pod network add-on(Here, we use Fannel to establish our pod network.)

   You must install a pod network add-on so that your pods can communicate with each other.

   kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
   

Join Node

• Run the command which was displayed in the output of kubeadm init. It looks like the following command.

  sudo kubeadm join --token \{token\} \{master-ip\}:\{master-port\} --discovery-token-ca-cert-hash sha256:\{hash\}
  

• If you forget the command displayed in the output of kubeadm init on the master node or the old one isn't work, then you can use the following command on the master node to generate a new one.

  sudo kubeadm token create --print-join-command
  

Delete Node

• If we decide to delete Node2, then please follow the following instruction.

1. Delete node2 on the master node

   kubectl drain node2 --delete-local-data --force --ignore-daemonsets
   kubectl delete node node2
   

2. Reset node2 on the node2 node

   sudo kubeadm reset
   sudo ifconfig cni0 down
   sudo ip link delete cni0
   sudo ifconfig flannel.1 down
   sudo ip link delete flannel.1
   sudo rm -rf /var/lib/cni/
   

   After all done, Flush iptables.

   sudo iptables -F && sudo iptables -t nat -F && sudo iptables -t mangle -F && sudo iptables -X