Install openshift with a n-tier architecture


A basic install of OpenShift setup a delegation from the entreprise DNS to the OpenShift DNS.
But we can also setup OpenShift, to use a private DNS not exposed to any other services than OpenShift.

In this setup, user applications will be accessible via nginx.
SSH and git will be accessible with the IP address directly.

This setup is quite interesting for companies wanting the broker, the console, SSH and git being only available on the private network.

```
      Internet
         |
         |
        \|/
    /---------\
    |  Front  |
___ |  -----  | ______________________________________
    |  Nginx  |\             
    |  80/443 | \          LAN
    \---------/  \
         |        \
         |         \
         |          /----------\
         |          |  Middle  |
         |          |  ------  |
         |          |  Broker  |
         |          |  Console |
         |          |    DNS   |
         |          \----------/
         |              / /|\
         |             /   |
         |            /    |
         |           /     |
         |          /      |
        \|/        /       |
/----------------------\   |
|    OpenShift Node    |   |
|    --------------    |   |
|   user applications  |   |
\----------------------/   |
        /|\                |
         |                 |
         |                 |
      Git Push        Admin Access
   (from the LAN)
   
```