title: How to retain docker alpine container after "exit" is used?
body: <p>Like for example if I use command <code>docker run -it alpine /bin/sh</code>
  it starts a terminal after which I can install packages and all. Now when I use <code>exit</code> command it goes back to the terminal. (main one)</p>
  
  <p>So how can I access the same container again? 
  When I run that command again, I get a fresh alpine.</p>
  
  <p>Please help</p>