VNC Configuration

                                                VNC Configuration

 Installing the required packages

·         The server package is called 'vnc-server'. Run the command: rpm -q vnc-server

·         The result will be either package vnc-server is not installed or something like vnc-server-4.0-11.el

·         If the server is not installed, install it with the command: yum install vnc-server

Make sure to install a window manager in order to get a full-featured GUI desktop

·         You can use the command yum groupinstall "GNOME Desktop Environment" to install the Gnome Desktop and requirements

·         If you are running CentOS 6, the command is yum groupinstall Desktop

·         If you are running CentOS 6, the server is: tigervnc-server not: vnc-server

Create the VNC user accounts

·         useradd oracle

·         passwd oracle

Edit the server configuration

·         Edit /etc/sysconfig/vncservers, and add the following to the end of the file

·         VNCSERVERS="1:root 2:oracle"

·         VNCSERVERARGS[1]="-geometry 640x480"

·         VNCSERVERARGS[2]="-geometry 640x480"

·         VNCSERVERARGS[3]="-geometry 800x600"

Set your users' VNC passwords

·         su - oracle

·         $ vncpasswd

·         [~]$ cd .vnc

·         [.vnc]$ ls

·         passwd

·         [.vnc]$ exit

·          

Confirm that the vncserver will start and stop cleanly

·         We will create the xstartup scripts by starting and stopping the vncserver as root. We also enable the vncserver service to be automatically started.

# /sbin/service   vncserver start

# /sbin/service   vncserver stop

# /sbin/chkconfig vncserver on

Amend the iptables (MOST IMPORTANT STEP)

·         The iptables rules in /etc/sysconfig/ need to be amended to open the VNC ports; as needed, if a local ipv6 setup is being used, those need to be amended as well:

[root@abc21 sysconfig]# cat iptables

# Firewall configuration written by system-config-firewall

# Manual customization of this file is not recommended.

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

-A INPUT -i eth1 -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp -m multiport --dports 5901:5903,6001:6003 -j ACCEPT

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

[root@abc21 sysconfig]#         

Start the VNC server

Start from the user through which you want to use VNC

# /sbin/service vncserver start

Starting vncserver at boot

To start vncserver at boot, enter the command:

/sbin/chkconfig vncserver on