How to install CSF firewall on centos linux

Homepage: http://www.configserver.com/cp/csf.html
Description: Advanced Policy Firewall (APF) is an iptables(netfilter) based firewall system designed around the essential needs of todays Internet deployed servers and the unique needs of custom deployed Linux installations. The configuration of APF is designed to be very informative and present the user with an easy to follow process, from top to bottom of the configuration file. The management of APF on a day-to-day basis is conducted from the command line with the apf command, which includes detailed usage information and all the features one would expect from a current and forward thinking firewall solution.

Pre Setup: Make sure perl modules are installed

yum install -y perl-libwww-perl

Step 1: Download, unpack, install of APF from source.

cd /usr/local/src
wget http://www.configserver.com/free/csf.tgz
tar -zxvf csf.tgz
cd csf
./install.sh

Step 1.1: Cleanup source install files.

rm -Rf /usr/local/src/csf* && cd

Step 2: Backup orginal CSF config

cp /etc/csf/csf.conf /etc/csf/csf.conf.bak

Step 3: Edit current CSF config

nano -w /etc/csf/csf.conf