title: Kubernetes: Unable to connect to the server: Service Unavailable
body: <p>After reboot of kubernetes master node,  &quot;kubectl&quot; command throwing this error:</p>
  <pre><code>Unable to connect to the server: Service Unavailable
  </code></pre>
  <p>Kindly suggest how to start the service or fix this issue.</p>
  <pre><code># kubectl get nodes
  Unable to connect to the server: Service Unavailable
  #
  # kubectl cluster-info
  
  To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
  Unable to connect to the server: Service Unavailable
  #
  # echo $KUBECONFIG
  /root/.kube/config
  #
  
  # kubectl config view
  apiVersion: v1
  clusters:
  - cluster:
      certificate-authority-data: DATA+OMITTED
      server: https://192.168.1.1:6443
    name: kubernetes
  contexts:
  - context:
      cluster: kubernetes
      user: kubernetes-admin
    name: kubernetes-admin@kubernetes
  current-context: kubernetes-admin@kubernetes
  kind: Config
  preferences: {}
  users:
  - name: kubernetes-admin
    user:
      client-certificate-data: REDACTED
      client-key-data: REDACTED
  #
  </code></pre>