title: Mac OS X sudo docker Cannot connect to the Docker daemon. Is the docker daemon running on this host?
body: <p>I installed docker and there seems to be some issue. </p>
  
  <pre><code>$ docker ps
  </code></pre>
  
  <blockquote>
    <p>CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES</p>
  </blockquote>
  
  <pre><code>$sudo docker ps
  </code></pre>
  
  <blockquote>
    <p>Cannot connect to the Docker daemon. Is the docker daemon running on this host?</p>
  </blockquote>
  
  <p>What should I do?</p>