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:
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