when I restart the ubuntu,and type kubectl get nodes
It always show
lal@kmaster:~$ kubectl get nodes
The connection to the server 192.168.1.111:6443 was refused - did you specify the right host or port?
you can use these command to solve this issue: 1. sudo -i 2. swapoff -a 3. exit 4. strace -eopenat kubectl version try kubectl get nodes now.