This page explains how to install VNC on your Cloud Server. This article was based upon the CentOS 5 distribution. This tutorial assumes you have root access to your server and are running on a clean installation.
Note: In order to use this you must have at least 512MB of RAM or X Windows will not run.
WARNING: Running VNC on your Cloud Server will consume large amounts of bandwidth. Please use wisely!
If you would like information about tunnelling VNC over SSH please visit http://martybugs.net/smoothwall/puttyvnc.cgi
This article will assume you know how to use the YUM (YUM Update Manager) from the CentOS - Setup article.
# yum install perl
We will need to install the X-Windows platform to run the graphical portion of this project. X11 is a graphical display server, and will server and will sit above the Window Manager.
To install run the following as root:
# yum groupinstall "X Window System"
# yum groupinstall "KDE Desktop"
Also, this may be needed:
# yum install kde-session
# yum groupinstall "GNOME Desktop Environment"
Also, this may be needed:
# yum install gnome-session
TWM is the default X-Window Manager and you don't have to install any additional packages, it is light and will run on almost anything, but is also not very user friendly and almost requires a power-user.
VNC is the service that display your X output to a tcp connection over the internet.
# yum install vnc-server
# nano /etc/sysconfig/vncservers
Insert the following lines into the file:
VNCSERVERS="1:someguy" VNCSERVERARGS="-geometry 800x600 -depth 16"
This will create a VNC session for one user with the username of someguy. If you would like to setup multiple users you will need to add additional users to that line. For example...
1:someguy 2:someperson 3:somegirl
You will also need to add additional VNCSERVERARGS lines to correspond to each user. Change the  to match the session number.
If you have a firewall running, you will need to open port 5901. For example, on CentOS, run:
# iptables -I INPUT 1 -p tcp --dport 5901 -j ACCEPT
If needed, replace 5901 with a range, depending on the number of sessions required (e.g. 5901:5905).
Save the new iptables rule:
# service iptables save
# su username $ cd ~
take note of the '.' in front of the name
$ mkdir .vnc $ cd .vnc
Insert the configuration below (this is for a KDE-VNC session):
#!/bin/sh unset SESSION_MANAGER exec /etc/X11/xinit/xinitrc [ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup [ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources xsetroot -solid grey vncconfig -iconic & xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" & startx & exec kde-session &
Make the file executable:
$ chmod u+x xstartup
Set the user's private VNC connection password
Make sure you exit out of your user session and go back to 'root'.
start the server:
# service vncserver start
Open up your VNC client and type in your external IP address, colon, then your session ID configured in /etc/sysconfig/vncservers. The session number must correspond to the user name or it will not connect.
To close the connection simple close the window.
To stop the VNC server type the following:
# service vncserver stop
Kelly Koehn 14:24, 17 March 2009 (CDT)
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