[ Thanks to Falko
Timme for this link. ]
“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.“For the administration of the MySQL database you can use web
based tools like phpMyAdmin which will also be installed in this
howto. phpMyAdmin is a comfortable graphical interface which means
you do not have to mess around with the command line.”