Check this out: https://www.cloudflare.com/technical-resources/#mod_cloudflare
Option 1: Installation from Packages
Download the appropriate package to your web server and install it using your operating system’s ‘rpm’ or ‘dkpg’ commands.
For RedHat / CentOS / CloudLinux:
# yum install glibc.i686
# rpm -i mod_cloudflare-elX.latest.rpm
For Debian / Ubuntu:
# dpkg -i mod_cloudflare-XXXXX.latest.deb
RHEL/CentOS/CloudLinux
RHEL/CentOS/CloudLinux 7 (64-bit) RHEL/CentOS/CloudLinux 6 (64-bit)
Debian
Debian 8 (64-bit) Debian 7 (64-bit)
Ubuntu
Ubuntu 16.04 (64-bit) Ubuntu 15.10 (64-bit) Ubuntu 15.04 (64-bit)Ubuntu 14.04 (64-bit) Ubuntu 12.04 (64-bit)