title: how to configure docker container to run /usr/sbin/sshd upon startup
body: <p>I have a docker container, which I need to run as a deamon with -d flag.
  Is there a way to specify, that I want to run /usr/sbin/sshd as a startup process for this container?
  I have tried this, but my container did not stay around:
  sudo docker run -p 9000:9000 -d me/my-container /usr/sbin/sshd</p>