kubectl get nodes 执行错误：The connection to the server localhost:8080 was refused - did you specify the

[root@centos02 kubernetes]# kubectl get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?

1.查看是否有"/etc/kubernetes/admin.conf"文件。如果没有则从主节点复制到本机环境

scp -r root@192.168.88.5:/etc/kubernetes/admin.conf /etc/kubernetes/admin.conf

2.配置环境变量并刷新

vim /etc/profile
export KUBEConFIG=/etc/kubernetes/admin.conf
#保存退出并执行以下代码使用环境变量生效
source /etc/profile