Howtoforge published a guide on Virtual Hosting with PureFTPd and MySQL on CentOS 5.0
This document describes how to install a PureFTPd server that uses virtual users from a MySQL database instead of real system users. This is much more performant and allows to have thousands of ftp users on a single machine. In addition to that I will show the use of quota and upload/download bandwidth limits with this setup. Passwords will be stored encrypted as MD5 strings in the database.Virtual Hosting With PureFTPd And MySQL On CentOS 5.0