WHM/cPanel is one of the best control panels for web-hosting industry. Here I am discussing about the system/server requirements and the steps for installing cpanel on it.
Component Minimum Requirement Processor 266 MHz processor Memory 512 MB RAM (1 GB recommended when hosting many accounts) Disk Space 10GB hard disk
Supported Virtual Environments  KVM Linux-VServer Microsoft Server 2008 Hyper-V  OpenVZ (stable releases only) Oracle VM VirtualBox, VirtualBox OSE Virtuozzo VMware Server, VMware ESX Server Xen, XenEnterprise, XenExpress, XenServer
Supported Operating Systems
(i386 and x86-64 ONLY) CentOS versions 5.x, 6.x Red Hat Enterprise Linux versions 5.x, 6.x CloudLinux 5.x, 6.x 
How to install cPanel on CentOS
Follow the steps pasted below to install cpanel/WHM on your server which has CentOS as Operating System.
1. cd /home — Opens the directory /home. 2. wget -N http://layer1.cpanel.net/latest — Fetches the latest installation file from the cPanel servers. 3. sh latest — Opens and runs the installation files.[Note: Better run this command under screen, because it will take some hours to complete the installation process.] 4. /usr/local/cpanel/cpkeyclt — Activates your license after installation.
Accessing cPanel and WHM
You can simply access your cpanel or WHM by browsing your server’s IP address followed by the corresponding port number
Port number for cPanel : 2082/2083(ssl) Port number for WHM : 2086/2087(ssl) http://IPAddress:port