domain name system - Setting up primary and secondary dns on one server

I'm configuring a vps to be used as webserver, and everything is going well, but now I am coming to the point of DNS. The VPS has two working IP Addresses assigned to it.
Now I need to get a primary DNS running on one, and a secondary DNS on the other IP Address (I know it is better and safer to run it on two different machines, but that I don't have).

I can find loads and loads of articles on the iNet on how to configure one DNS on one machine, or two on two different machines, but nothing about how to configure two dns'es on one single machine.
Anyone who can help me?
I'm using Centos 6.3

Answer

You can do what you want easily: Configure your DNS server to listen on both IP addresses.
The internet has no way of knowing whether it's one server or two - it's just happy you have two IP addresses serving your zone's information.

If you do this however you are intentionally disregarding the entire purpose of requiring two DNS servers.

There are plenty of companies out there that provide free secondary DNS <--- Google Phrase.
Take the time to understand WHY we requrie you to have two functioning DNS servers before you go about breaking the internet.

Please also purchase and read the latest edition of DNS and BIND before doing anything else.
This is required reading for anyone who wants to run a DNS server on the internet.

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