Apache: Enable Mod QoS
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Cara ini juga mungkin bisa digunakan untuk mengatasi serangan slowloris
Download
cd /tmp/ wget http://ncu.dl.sourceforge.net/project/mod-qos/mod_qos-10.14.tar.gz tar xvfz mod_qos-10.14.tar.gz
Instalasi paket pendukung
apt-get install apache2-threaded-dev gcc
Compile
cd mod_qos-10.14/apache2/ apxs2 -i -c mod_qos.c
Konfigurasi
cd /etc/apache2/mods-available/
Edit
vi qos.load
isi dengan
LoadModule qos_module /usr/lib/apache2/modules/mod_qos.so
Edit
vi qos.conf
Isi dengan
## QoS Settings
<IfModule mod_qos.c>
# handles connections from up to 100000 different IPs
QS_ClientEntries 100000
# will allow only 50 connections per IP
QS_SrvMaxConnPerIP 50
# maximum number of active TCP connections is limited to 256
MaxClients 256
# disables keep-alive when 70% of the TCP connections are occupied:
QS_SrvMaxConnClose 180
# minimum request/response speed (deny slow clients blocking the server, ie. slowloris keeping connections open without requesting anything):
QS_SrvMinDataRate 150 1200
# and limit request header and body (carefull, that limits uploads and post requests too):
# LimitRequestFields 30
# QS_LimitRequestBody 102400
</IfModule>
Enable mod qos
a2enmod qos /etc/init.d/apache2 restart