title: Nginx is inner or outer Docker
body: <p>When I read some articles about Nginx and Docker. I know that Nginx is a web-server and it's work is to get request from client and contribute request to specific application inner machine.
  Docker is a container that can contain my application inner it. It can contains a lot of things, like db, web application. It can install some packages like a Unix machine.<br>
  My question is when configure Nginx used for Docker application. We will install Nginx inner Docker or inner our machine(ubuntu or Centos...)?<br></p>