CentOS 6.3 --- Add GNOME Desktop Environment into CentOS Minimal installation

If execute graphical tool on a minimal installation of CentOS 6.3, it will cause the failure that this tool cannot be initialized.
This is why I want to add a GUI to CentOS at the moment.

For installing Gnome Desktop, we can execute the yum command as yum groupinstall basic-desktop desktop-platform x11 fonts to download & install the related packages from Internet.
To start X Windows by typing startx command
The X Windows will show up
and we can initialize the Logical Volume Management now.

If we hope that it started on boot, please remember to change the run level from 3 to 5 in /etc/inittab file.