Take a look at www.pureftpd.org very easy and well documented:
**** Usage with Xinetd ****
Add the following entry to the /etc/xinetd.conf file :
service ftp
{
socket_type = stream
server = /usr/local/sbin/pure-ftpd
protocol = tcp
user = root
wait = no
disable = no
}
On Redhat systems, you can also put this in a /etc/xinetd.d/pure-ftpd file.
Then, restart the server :
killall -USR2 xinetd