cd apache2
apxs -cia mod_qos.c

LoadModule qos_module /usr/lib/apache2/modules/mod_qos.so

# minimum request rate (bytes/sec at request reading):
QS_SrvRequestRate                                 120
# limits the connections for this virtual host:
QS_SrvMaxConn                                     300
# allows keep-alive support till the server reaches 600 connections:
QS_SrvMaxConnClose                                150
# allows max 50 connections from a single ip address:
QS_SrvMaxConnPerIP                                 20

<Location /qos>
   SetHandler qos-viewer
</Location>