title: Istio installation: Opening storage failed mkdir data/: permission denied
body: <p>After running the install command for Istio via Helm, </p>
  
  <p>I'm getting this:</p>
  
  <pre><code>My prometheus-f556886b8-96kjv                0/1       CrashLoopBackOff
  </code></pre>
  
  <p>if i run:</p>
  
  <pre><code>kubectl -n istio-system logs -f prometheus-f556886b8-96kjv 
  </code></pre>
  
  <p>I see:</p>
  
  <pre><code>level=error ts=2019-01-22T04:15:25.485061247Z caller=main.go:597 err="Opening storage failed mkdir data/: permission denied"
  </code></pre>