title: Dont understand service account for ingress
body: <p>I am learning ingress and ingress controller. So I understand that I have to do the following tasks-</p>
  <ol>
  <li>ingress controller deployment</li>
  <li>create service account</li>
  <li>ingress controller service nodeport expose</li>
  <li>create ingress resources to attach services.</li>
  </ol>
  <p>Now my question is why we need a service account?? And what role should I attach with that service account and how do I use that service account?</p>