Kubernetes-kubectl The connection to the server localhost:8080 was refused -did you specify

今天在Kubernetes的從節點上運作指令【kubectl】出現了如下錯誤：

[[email protected] kubernetes]# kubectl get pod The connection to the server localhost:8080 was refused - did you specify the right host or port?

出現這個問題的原因是kubectl指令需要使用kubernetes-admin來運作，解決方法如下，将主節點中的【/etc/kubernetes/admin.conf】檔案拷貝到從節點相同目錄下，然後如提示配置環境變量：

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

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

也可以簡單方法

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

source ~/.bash_profile
           

接着再運作kubectl指令就OK了

[[email protected] ~]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-0               Healthy   {"health":"true"}