Kubernetes - The connection to the server 10.0.2.15:6443 was refused - did you specify the right host or port?

scnzzh@ZUBT1:~$ kubectl get nodes
The connection to the server 10.0.2.15:6443 was refused - did you specify the right host or port?

How to fix:

1. sudo swapoff -a
2. exit
3. strace -eopenat kubectl version

原文：https://www.cnblogs.com/zhangzhihui/p/13720248.html