Setup Approx On A Debian Server

See this page here : http://www.debianadmin.com/upgrade-multiple-debian-systems-with-approx.html#more-870

Approx is like the equivalent of Microsoft’s WSUS or SUS on a Debian system. It’s a proxy service that runs on a server to save on bandwidth and time for installing programs and updates by utilizing a cache. Instead of continuously downloading, the updates are stored locally on the Approx server. This helps if you have multiple Debian systems that will need updating. An added bonus is that it works on Ubuntu also (seeing as Ubuntu is a Debian derivative).

To install:
apt-get install approx

Here are the lines that I have added to the file /etc/apt/sources.list on the client computer:

deb http://server:9999/debian/ stable main non-free contrib
deb-src http://server:9999/debian/ lenny main non-free contrib

deb http://server:9999/security stable/updates main non-free contrib
deb-src http://server:9999/security lenny/updates main non-free contrib

deb http://server:9999/volatile lenny/volatile main non-free contrib
deb-src http://server:9999/volatile lenny/volatile main non-free contrib