linux/sshx/xorg

http://unix.stackexchange.com/questions/26328/setting-up-x-server-on-centos6-minimal
If CentOS has already been installed without a graphical interface,
you can install this with the following commands:

$ yum groupinstall "X Window System" "Desktop" "Desktop Platform"

$ yum install gdm

If you would like this to be the default runlevel, you can edit
/etc/inittab and set the default level to 5 instead of 3:

$ vi /etc/inittab

Change:
id:3:initdefault:

To:
id:5:initdefault: