Howtogeek posted a guide about setting up virtual hosting with PureFTPd and MySQL on Fedora 13

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 (Incl. Quota And Bandwidth Management) On Fedora 13