title: docker: SSH access directly into container
body: <p>Up to now we use several linux users:</p>
  
  <ul>
  <li>system_foo@server</li>
  <li>system_bar@server</li>
  <li>...</li>
  </ul>
  
  <p>We want to put the system users into docker container.</p>
  
  <ul>
  <li>linux user <code>system_foo</code> --> container <code>system_foo</code></li>
  </ul>
  
  <p>The changes inside the servers are not problem, but remote systems use these users to send us data.</p>
  
  <p>We need to make <code>ssh system_foo@server</code> work. The remote systems can't be changed.</p>
  
  <p>I would be very easy if there would be just one system per linux operating system (pass port 22 to the container). But there are several.</p>
  
  <p>How can we change from the old scheme to docker containers and keep the service <code>ssh system_foo@server</code> available without changes at the remote site?</p>
  
  <p>Please leave a comment if you don't understand the question. Thank you.</p>