VNC Access on headnode - Revision history

Antony at 12:52, 18 December 2023

2023-12-18T12:52:19Z

David: /* Install VNC */

2017-11-07T16:25:02Z

Install VNC

Michael: Created page with "===== Install VNC ===== If you want to use vncviewer on the actual headnode, you need to install the pacakge '''vnc''' yum install vnc # on > centos 5.6, use vnc-serv..."

2012-12-07T11:08:51Z

Created page with "===== Install VNC ===== If you want to use vncviewer on the actual headnode, you need to install the pacakge '''vnc''' <syntaxhighlight> yum install vnc # on > centos 5.6, use vnc-serv..."

New page

===== Install VNC =====

If you want to use vncviewer on the actual headnode, you need to install the pacakge '''vnc'''
<syntaxhighlight>
yum install vnc

# on > centos 5.6, use vnc-server
yum install vnc-server
</syntaxhighlight>

===== Update Server config =====

Edit the /etc/sysconfig/vncservers file
<syntaxhighlight>
<append the following>
VNCSERVERS="1:root 2:viglen"
VNCSERVERARGS[1]="-geometry 1280x1024"
VNCSERVERARGS[2]="-geometry 1280x1024"
</syntaxhighlight>

===== Set User Passwords =====

For each user you've added, run vncserver to set a password:

<syntaxhighlight>
[pacey@pcmtest ~]$ vncserver

You will require a password to access your desktops.

Password:
Verify:

New 'pcmtest.viglen.co.uk:3 (pacey)' desktop is pcmtest.viglen.co.uk:3

Creating default startup script /home/pacey/.vnc/xstartup
Starting applications specified in /home/pacey/.vnc/xstartup
Log file is /home/pacey/.vnc/pcmtest.viglen.co.uk:3.log

</syntaxhighlight>

Or if you need to change the user password
<syntaxhighlight>
# NOTE vnc password are insecure, only first 8 characters are used
vncpasswd
</syntaxhighlight>
===== Modify User XStartup File =====

Edit the ~/.vnc/xstartup file for earch user
<syntaxhighlight>
#!/bin/sh

# Uncomment the following two lines for normal desktop:
# 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" &
#twm &

</syntaxhighlight>

===== Restart the VNCServer =====

kill off any vnc servers and restart the daemon
<syntaxhighlight>
[root@pcmtest ~]# pkill Xvnc
[root@pcmtest ~]# /etc/init.d/vncserver restart
Shutting down VNC server: 1:root 2:pacey 3:viglen [ OK ]
Starting VNC server: 1:root
Welcome! The PCM web GUI is installed. It is available here:
http://pcmtest.viglen.co.uk:8080/platform

New 'pcmtest.viglen.co.uk:1 (root)' desktop is pcmtest.viglen.co.uk:1

Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/pcmtest.viglen.co.uk:1.log

2:pacey
New 'pcmtest.viglen.co.uk:2 (pacey)' desktop is pcmtest.viglen.co.uk:2

Starting applications specified in /home/pacey/.vnc/xstartup
Log file is /home/pacey/.vnc/pcmtest.viglen.co.uk:2.log

3:viglen
New 'pcmtest.viglen.co.uk:3 (viglen)' desktop is pcmtest.viglen.co.uk:3

Starting applications specified in /home/viglen/.vnc/xstartup
Log file is /home/viglen/.vnc/pcmtest.viglen.co.uk:3.log

[ OK ]
</syntaxhighlight>

===== Access the VNC Server =====
Use ssh for port forwarding instead of having the VNC port open
<syntaxhighlight>
ssh -L9000:localhost:5903 viglen@pcmtest.viglen.co.uk

then on another terminal run:
vncviewer localhost:9000

[* note vncviewer is part of the vnc package in centos, may need to be installed]

NOTE
- vnc password is the one that was set using vncpasswd above
- desktop lock password is the users standard password
- once user logs out from ssh session, vnc access will no longer be available
</syntaxhighlight>

@@ Line 1: / Line 1: @@
-===== Install VNC =====
+=== Super Quick + Easy install ===
 If you want to use vncviewer on the actual headnode, you need to install the pacakge '''vnc'''
@@ Line 14: / Line 115: @@
 </syntaxhighlight>
-===== Update Server config =====
+=== Update Server config ===
 Edit the /etc/sysconfig/vncservers file
@@ Line 24: / Line 125: @@
 </syntaxhighlight>
-===== Set User Passwords =====
+=== Set User Passwords ===
 For each user you've added, run vncserver to set a password:
@@ Line 49: / Line 150: @@
 vncpasswd
 </syntaxhighlight>
-===== Modify User XStartup File =====
+=== Modify User XStartup File ===
 Edit the ~/.vnc/xstartup file for earch user
@@ Line 68: / Line 169: @@
 </syntaxhighlight>
-===== Restart the VNCServer =====
+=== Restart the VNCServer ===
 kill off any vnc servers and restart the daemon

@@ Line 3: / Line 3: @@
 If you want to use vncviewer on the actual headnode, you need to install the pacakge '''vnc'''
 <syntaxhighlight>
 yum install vnc