title: Docker: docker: Error response from daemon: linux spec user: unable to find user myuser: no matching entries in passwd file
body: <pre><code>[root@mymachine redisc]# docker run -p 6379:6379 --user myuser redisc
  docker: Error response from daemon: linux spec user: unable to find user myuser: no matching entries in passwd file.
  </code></pre>
  
  <p>but i can become myuser on the host</p>
  
  <pre><code>[root@mymachine redisc]# sudo su myuser
  [myuser@mymachine redisc]#
  </code></pre>
  
  <p>How would i be able to run as myuser in the container?</p>