kubeadm报错：The connection to the server localhost:8080 was refused - did you specify the right host

The connection to the server localhost:8080 was refused - did you specify the right host or port?

报错现象

[[email protected] ~]# kubectl apply -f calico.yaml 
The connection to the server localhost:8080 was refused - did you specify the right host or port?

报错原因

kubectl命令需要使用kubernetes-admin来运行

解决方法

将主节点（master节点）中的【/etc/kubernetes/admin.conf】文件拷贝到从节点相同目录下:
scp -r /etc/kubernetes/admin.conf ${node1}:/etc/kubernetes/admin.conf

配置环境变量：
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

立即生效：
source ~/.bash_profile