title: How can the OR selector be used with labels in Kubernetes?
body: <p>How the OR expression can be used with selectors and labels?</p>
  
  <pre><code>  selector:
      app: myapp
      tier: frontend
  </code></pre>
  
  <p>The above matches pods where labels <code>app==myapp</code> <strong>AND</strong> <code>tier=frontend</code>. </p>
  
  <p>But the OR expression can be used?</p>
  
  <p><code>app==myapp</code> <strong>OR</strong> <code>tier=frontend</code>?</p>