If you want use GUI interface for Linux, Firt thing is You need install centos6.x for your vps or server. We recommend at least 512MB memory XEN VPS for Linux desktop. 1GB ram is better.

Step1: Install GNOME Desktop on Centos:

yum -y groupinstall "Desktop"

Step2: Install VNC server and firefox on Centos:

yum -y install tigervnc-server xorg-x11-fonts-Type1 firefox  

Step3: Start the VNC server on Linux 

Login with the user you want to use the desktop for (safer to use a user other than root), and run the following command:

vncserver

When you run the command the first time, you will be asked to set a password for the account on VNC. After you set the password, you should see the following:

[root@ComfortVPS ~]# vncserver
You will require a password to access your desktops.
Password:
Verify:
xauth:  creating new authority file /root/.Xauthority
New 'ComfortVPS.com:1 (root)' desktop is ComfortVPS.com:1
Creating default startup script /root/.vnc/xstartup
Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/ComfortVPS.com:1.log

Step4: Use a VNC client to connect to your Linux server

On step3, comfortvps.com:1 is the vnc address, comfortvps.com is the hostname of my linux server in my case. :1 is the vnc port. We recommend you use IP:1 instead domain name. eg. 50.2.65.1:1 . use command man vncserver for more help. 

We tested on centos6 32bit, and below is the screen shot for my gnome desktop:

How to setup KDE desktop for centos?

Step1: Install KDE Desktop on Centos 6.x:

yum -y groupinstall "KDE Desktop"

Step2,Step3,Step4 are all the same as install gnome desktop. 

Below is our KDE Desktop screenshot for centos 6.x :

if you want use centos5.x (not recommend):

yum -y install kdepim
yum -y groupinstall "X Window System" "KDE (K Desktop Environment)"
yum -y install vnc vnc-server firefox

Do you have any support for this install?

ComfortVPS DO NOT provide free support for this desktop installation.  We wrote this tutrial for save your time but don't provide free support. Please google it for more help.

You can purchase our One-time special support if you really want us to install desktop for your centos server. It's $20 one time fee for centos desktop installation. normally will be done within 1 hour after you give us your server root password and ip. It's just one time installation fee, NOT include any other support like how to use the desktop GUI interface.