title: kubelet service is not starting
body: <p>While running commands such as kubectl get nodes resulting with following error:</p>
  
  <p>The connection to the server :6443 was refused - did you specify the right host or port?</p>
  
  <p>I ran systemctl status kubelet.service and receiving the following state:</p>
  
  <pre><code>root@k8s-l2bridge-ma:~# sudo systemctl status kubelet.service
  
  ● kubelet.service - kubelet: The Kubernetes Node Agent
     Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
    Drop-In: /etc/systemd/system/kubelet.service.d
             └─10-kubeadm.conf
     Active: activating (auto-restart) (Result: exit-code) since Tue 2020-06-16 11:46:05 UTC; 9s ago
       Docs: https://kubernetes.io/docs/home/
    Process: 28012 ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS (code=exited, status=255)
   Main PID: 28012 (code=exited, status=255)
  
  Jun 16 11:46:05 k8s-l2bridge-ma systemd[1]: kubelet.service: Failed with result 'exit-code'.
  </code></pre>
  
  <p>How can I troubleshoot the failure and find out what is wrong? I found few leads googling but nothing solved the problem.</p>