title: Kubectl using command to get cluster status
body: <p>I need to create a shell-script which examine the cluster
  Status.**</p>
  
  <p>I saw that the <code>kubectl describe-nodes</code> provides lots of data
  I can output it to json and then parse it but maybe it’s just overkill.
  Is there a simple way to with <code>kubectl</code> command to get the status of the cluster ? just if its up / down</p>