title: Docker internals/architecture
body: <p>I've started using Docker but I want to understand it better ( a bit better). So, I am searching for a book/article to get information how it works internally ( on the OS level). I suppose that it cannot be easy subject but it should be easier than real virtualization. </p>
  
  <p>I am asking for referencing me to any book/an article. I tried to find any book but I didn't find something about Docker internals.</p>