For Intsall WHM in centos you need must os version greater then equal 6
1. [root@server1 ~]# yum update
2. [root@server1 ~]# wget -N http://httpupdate.cpanel.net/latest
3. [root@server1 ~]# sh latest
Only three commands use for installing WHM in centos
In installing process you have any problem or any internet proble you should format your vps and reinstall whm again.