David Ghedini

Linux, Java, Oracle, and PostgreSQL

David Ghedini

Sunday Jul 22, 2012

VNC Server on CentOS 6

This post will cover installing VNC with GNOME Desktop on a remote server running CentOS 6.

Installation has changed a bit since CentOS 5, but is still simple and straight forward.

1. Install Tigervnc Server

[root@demo ~]# yum -y install tigervnc-server

2. Install X Windows and GNOME.

This used to be yum groupinstall "X Window System" "GNOME Desktop Environment", but is now simply:

yum groupinstall "X Window System" "Desktop"

3. Create a user (or use and existing user) and create VNC login.

[root@demo ~]# useradd david
[root@demo ~]# passwd david
Changing password for user david.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root@demo ~]# su - david

4. Switch to the user (su - user) and issue 'vncpasswd' to set the VNC password

[david@demo ~]$ vncpasswd
[david@demo ~]$

5. Start VNC using 'vncserver :1'

[david@demo ~]$ vncserver :1
xauth:  creating new authority file /home/david/.Xauthority

New 'demo.domain.net:1 (david)' desktop is demo.domain.net:1

Creating default startup script /home/david/.vnc/xstartup
Starting applications specified in /home/david/.vnc/xstartup
Log file is /home/david/.vnc/demo.domain.net:1.log

[david@demo ~]$

6. Stop VNC using using 'vncserver -kill :1'

[david@demo ~]$ vncserver -kill :1

7. Setting resolution:

In /etc/sysconfig/vncservers, add a line for each user.

NOTE: if you if you need to install Oracle software, use geometry 1024x768.

You can also do this via the shell using: vncserver :1 -geometry 1024x768 -depth xx

# The VNCSERVERS variable is a list of display:user pairs.
# Uncomment the lines below to start a VNC server on display :2
# as my 'myusername' (adjust this to your own).  You will also
# need to set a VNC password; run 'man vncpasswd' to see how
# to do that.  
# DO NOT RUN THIS SERVICE if your local area network is
# untrusted!  For a secure way of using VNC, see this URL:
# http://kbase.redhat.com/faq/docs/DOC-7028

# Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.

# Use "-localhost" to prevent remote VNC clients connecting except when
# doing so through a secure tunnel.  See the "-via" option in the
# `man vncviewer' manual page.

# VNCSERVERS="2:myusername"
# VNCSERVERARGS[2]="-geometry 800x600 -nolisten tcp -localhost"
VNCSERVERARGS[1]="-geometry 1024x768"

For multiple users, simply add the user to the VNCSERVERS list and add a VNCSERVERARGS[x] entry.

So for three users:

VNCSERVERS="1:david 2:bill 3:john"
VNCSERVERARGS[1]="-geometry 1024x768"
VNCSERVERARGS[2]="-geometry 1024x768"
VNCSERVERARGS[3]="-geometry 640x480"

8. Open the port for the user, in this case 5801.

-A INPUT -m state --state NEW -m tcp -p tcp --dport 5801 -j ACCEPT

Save and restart IP Tables (/etc/init.d/iptables save | restart)

9. Connect using VNC Viewer with IP:1

10. You should now be connected to your CentOS desktop

CentOS Wiki: VNC ( Virtual Network Computing )

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