There are many ways to install the WebPanel on linux, but the most known way is to install on the Centos7.
Conifirming you are already logged in to your centos as a root
hostnamectl set-hostname what.everyourwebsite.com
# yum -y update
# yum -y install wget
# cd /usr/local/src
# wget http://centos-webpanel.com/cwp-el7-latest
# sh cwp-el7-latest