This guide explains how to configure VNC-server in CentOS 6.5 server. It is a very convinient way of administrating the CentOS 6.5 with the help of GUI(Graphics User Interface). The GUI can be access any where with the help of the VNC-client on any OS. The basic condition is that the connecting OS must have VNC-clients installed in it.

1 Preliminary Note

In my case I have a fresh installed CentOS6.5 Server on which I will be installing the VNC-server so that I can access the CentOS server with GUI. You can follow the guide for the basic installation of the CentOS server till Chapter 7. Please don't install the Development Tools. All of the cases are same as per the guide. My details are as follows:

IP address 192.168.0.100
Gateway 192.168.0.1
DNS     8.8.8.8    8.8.4.4
Hostname server1.example.com

VNC-server benefits

• Remote GUI administration makes work easy & convenient.
• Clipboard sharing between host CentOS server & VNC-client machine.
• GUI tools can be installed on the host CentOS server to make the administration more powerful
• Host CentOS server can be administered through any OS having the VNC-client installed.
• More reliable over ssh graphics.
• More reliable over RDP connections.

2 Installation

yum groupinstall Desktop

 yum install gnome-core xfce4 firefox

 yum install tigervnc-server

Now make the service on after every reboot

chkconfig vncserver on

3 Adding VNC user

useradd srijan

su - srijan

vncpasswd

vi /etc/sysconfig/vncservers

Give the entries like this.

[...]
VNCSERVERS="1:srijan"
VNCSERVERARGS[1]="-geometry 1024x768"

Here your port comes to be 5901 & 1024x768 resolution for the VNC client, you can choose resolution of your own choice.

Now I will restart the VNC server service as root user:

service vncserver restart

[root@server1 ~]# service vncserver restart
Shutting down VNC server:                                  [  OK  ]
Starting VNC server: 1:srijan xauth:  creating new authority file /home/srijan/.Xauthority

New 'server1.example.com:1 (srijan)' desktop is server1.example.com:1

Creating default startup script /home/srijan/.vnc/xstartup
Starting applications specified in /home/srijan/.vnc/xstartup
Log file is /home/srijan/.vnc/server1.example.com:1.log

                                                           [  OK  ]
[root@server1 ~]# 

Now to make the changes affective I will kill VNC & do some more configurations as follows:

pkill vnc

Open the file comment the line #twm & & add the line exec gnome-session as follows:

vi /home/srijan/.vnc/xstartup

#!/bin/sh

[ -r /etc/sysconfig/i18n ] && . /etc/sysconfig/i18n
export LANG
export SYSFONT
vncconfig -iconic &
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
OS=`uname -s`
if [ $OS = 'Linux' ]; then
  case "$WINDOWMANAGER" in
    *gnome*)
      if [ -e /etc/SuSE-release ]; then
        PATH=$PATH:/opt/gnome/bin
        export PATH
      fi
      ;;
  esac
fi
if [ -x /etc/X11/xinit/xinitrc ]; then
  exec /etc/X11/xinit/xinitrc
fi
if [ -f /etc/X11/xinit/xinitrc ]; then
  exec sh /etc/X11/xinit/xinitrc
fi
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#twm &
exec gnome-session &

reboot

4 VNC Client

At client end my OS is Ubuntu14.04 with vino installed on my client machine. Otherwise you can install any VNC-client of your choice. In case other OS say windows-7 you can install Realvnc-client or any other of your choice.

Again start the vncservice with the user srijan:
 

su - srijan

vncserver

[srijan@server1 ~]$ vncserver

New 'server1.example.com:1 (srijan)' desktop is server1.example.com:1

Starting applications specified in /home/srijan/.vnc/xstartup

Log file is /home/srijan/.vnc/server1.example.com:1.log

[srijan@server1 ~]$

Now I am going to connect with the VNC server through my VNC-client

It will prompt for the password as follows:

Put yourvncpassword the same which you gave at the time of adding the user srijan.

vi /etc/sysconfig/vncservers

VNCSERVERS="2:kishore"
VNCSERVERARGS[2]="-geometry 1024x768"