title: Failed to pull images from dockerhub in Kubernetes 0.15
body: <p>I followed kubernetes' guestbook, and changed image value like this, want to pull images from dockerhub.</p>
  
  <pre><code>"image": "redis"
  </code></pre>
  
  <p>But it failed. the log say:</p>
  
  <blockquote>
    <p>Failed to create pod infra container: image pull failed for gcr.io/google_c...</p>
  </blockquote>
  
  <p>And I set preloading images instructions:</p>
  
  <pre><code>"imagePullPolicy":"Never"
  </code></pre>
  
  <p>I am sure about the minion have the redis image</p>
  
  <p>But it also failed, and pulled from gcr.io</p>