Hi,

How to install gnome shell aka gnome 3 on centos 6.3?

I wouldn't.

There are a number of library conflicts that will occur, causing both gnome3 and gnome2 to fail.

You COULD recompile gnome3 from source, but be very sure the libraries and executables do not get put in /usr/bin, /usr/lib, /bin, or anywhere else in the system tree. Target /usr/local, or maybe /opt/gnome3.

This is the reverse problem caused by gnome3 when trying to add gnome2 to F15/16. The project got a different name, and the developers had to go in and change a lot of things before it would work without conflicts with gnome3.

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Why not use Fedora? It has Gnome 3 by default and the same .rpm package management as CentOS.

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is there a reason you are running a GUI on a server? as jpollard stated, gnome3 is not officially supported in CentOS 6.3, aka RHE 6.3. this is an Enterprise Server Clone. It is not intended to be run with a GUI.

but from the installer there is an older vs of both KDE and Gnome that will run properly. just you yum to install either then modify your run level at boot if you wish to start in GUI v CLI.

And remember, there is some tiein between gnome3 and systemd. I don't know if systemd is mandatory (likely not), but gnome3 gdm is started differently, and has different configuration files.

Now there may be some need for CentOS 6.3 Some server software may not be easily installed on Fedora, which requires systemd... and required dbus, which may/can cause other problems. And then there is the problem of getting it scheduled by systemd properly. It uses a thundering herd schedule that by default starts everything all at once without sequencing. You have to give ALL the required prerequisites before it will work properly. And the usual sysVinit system doesn't work.