CSF firewall is fairly easy to install and require only few steps through SSH.
Installation ============ Installation is quite straightforward:
Login in your server SSH as root user. cd /usr/src rm -fv csf.tgz wget https://download.configserver.com/csf.tgz tar -xzf csf.tgz cd csf sh install.sh
You can follow further steps at the following url - https://download.configserver.com/csf/install.txt