VNC Server installation in Centos

VNC server

VNC is used to display X windows sessions on remote computers.In this tutorial, we can learn how to setup VNC server on centos 6. Desktop environment is required in order to enable VNC server on centos.

Install VNC on Centos 6

Before installing VNC server, make sure you have installed any Desktop environment.
 

Step 1 » Issue the below command to install gnome desktop environment.[root@krizna ~]# yum groupinstall Desktop 
 

Step 2 » After installing gnome packages .Issue the below command to install VNC package along with dependencies.[root@krizna ~]# yum -y install tigervnc-server pixman pixman-devel libXfont
 

Step 3 » Create user name and password.[root@krizna ~]# adduser user1
[root@krizna ~]# adduser user2
[root@krizna ~]# passwd user1
[root@krizna ~]# passwd user2
Step 4 » Create VNC passwords for the Users created.[root@krizna ~]# su - user1
[user1@krizna ~]$ vncpasswd
Password:
Verify:
[user1@krizna ~]$ logout
[root@krizna ~]# su - user2
[user2@krizna ~]$ vncpasswd
Password:
Verify:
[user2@krizna ~]$ logout
Step 5 » Now open /etc/sysconfig/vncservers file and add the following lines at the end of the file( Edit as per your usernames ).VNCSERVERS="1:user1 2:user2"
VNCSERVERARGS[1]="-geometry 640x480"
VNCSERVERARGS[2]="-geometry 800x600"
Here we have configured session 1 with 640×480 resolution for the user “user1″ and session 2 with 800×600 resolution for the user “user2″.

Step 6 » Start vnc service[root@krizna ~]# service vncserver start
and issue this command to start vnc service automatically during startup.[root@krizna ~]# chkconfig --levels 235 vncsever on

Step 7 » Now in remote machine, start vncviewer type the IP and session as below to view their respective sessions.192.168.1.10:1 for user1
192.168.1.10:2 for user2

Step 8 >> open the vnc viewer in your desktop and provide the VNCSERVER-IP:SESSION ex: 192.168.2.10:1

                        provide the vnc password

Troubleshooting

» Check the iptables in the server, if you are not able to connect the sessions.
Issue the below command to stop iptables service.

[root@krizna ~]# service iptables stop

try again.
» you might receive the below error while starting the vnc service.

/usr/bin/Xvnc: symbol lookup error: /usr/bin/Xvnc: undefined symbol: pixman_composite_trapezoids
/usr/bin/Xvnc: symbol lookup error: /usr/bin/Xvnc: undefined symbol: pixman_composite_trapezoids

[FAILED]

Issue the below command to install pixman,pixman-devel and libXfont packages.
[root@krizna ~]# yum -y pixman pixman-devel libXfont 

[or]

This command will update everything .

[root@krizna ~]# yum update

and restart the VNC service and try again.