init-->xinetd

this is how we can convert the init based service ftp to an xinetd service..
1) First of all we need to make FTP not to listen on port 21 by making 'listen=NO' in
/etc/vsftpd/vsftpd.conf.
2) Then, make a file named ftp inside /etc/xinetd.d
the contents of /etc/xinetd.d/ftp should look like this

service ftp
{
disable = no
socket_type = stream
wait = no
user = root
server = /usr/sbin/vsftpd
server_args = /etc/vsftpd/vsftpd.conf
nice = 10
flags = IPv4
}

3) then restart the xinetd service by
#/etc/init.d/xinetd restart
#chkconfig xinetd on
now if u 'nmap localhost', u can see that the port 21 is now open...!