title: How to restart master node in kubernetes
body: <p>I have a kubernetes cluster with 3 masters and 3 workers, I want to restart one of the masters to update the system of the master machine.</p>
  
  <p>So can I just reboot the machine directly on the console with <code>reboot</code>,
  or some steps need to be done before the reboot to void the risk of out of service and data loss?</p>