title: How to mount "/" in kubernetes
body: <p>Saving Data in kubernetes is not persistant. so we should use volume.
  Forexample we can mount "/apt" to save data in "apt".
  Now I want to mount "/" but I get this error.</p>
  
  <blockquote>
    <p>Error: Error response from daemon: invalid volume specification:
    '/var/lib/kubelet/pods/26c39eeb-85d7-11e9-933c-7c8bca006fec/volumes/kubernetes.io~rbd/pvc-d66d9039-853d-11e9-8aa3-7c8bca006fec:/':
    invalid mount config for type "bind": invalid specification:
    destination can't be '/'</p>
  </blockquote>
  
  <p>The question is How can I mount "/" in kubernetes?</p>