Re: [foxboro] VNC - VPN Setup was IP routing/mapping

Ashley et. al.
You may be interested in the topic I wrote for the LTSP Wiki. It takes 
you through setting up a Linux server to allow multiple client connections.

http://wiki.ltsp.org/twiki/bin/view/Ltsp/VNC


We have a Sun Opteron V20z server with 2GB RAM running x86_64 Fedora 
Core. Normal working it has 40+ simultaneous VNC sessions. Most of these 
sessions have Foxboro display managers in them.

I run OLWM on the server so that it looks like the Foxboro Workstations. 
It has little memory impact. As you can see, the machine has never even 
had to page after 234 days of operation.

[dbond@ltssrv02 dbond]$ uptime
 11:30:20 up 234 days, 17:56, 126 users,  load average: 0.00, 0.00, 0.00

[dbond@ltssrv02 dbond]$ free
             total       used       free     shared    buffers     cached
Mem:       2062684     853004    1209680          0     206836     320096
-/+ buffers/cache:     326072    1736612
Swap:      3068404          0    3068404

The VNC server is best to use an old Version 3 server as it supports 
backing store so the configurator buttons work. The lastest Xorg X 
Servers do not support backing store.
The V3 VNC server can be hard to track down.

Regards
Darryl


Ashley Davey wrote:

>Hi Jeremy
> 
>I have no problem taking this back to the list.  
> 
>My Linux skills are limited, therefore I would appreciate it if you
>would send me your scripts.
> 
>What was not clear to me with VNC was the "windows" vs "unix" behavior.
> - Your explanation below has cleared that up.
> 
>I have checked and IceWM is available for Novell Suse Linux 10 
>(our company preferred distro. - I should be able to get help!!!)
>All I need now is to find an old PC.
> 
>I will keep you posted.
> 
>Regards
> 
>Ashley
>
>
>  
>
>>>>Jeremy Milum <jmilum@xxxxxxxxx> 00:20:10 24/11/05 >>>
>>>>        
>>>>
>On 11/17/05, Ashley Davey < Ashley.Davey@xxxxxxxxxxxx > wrote:
>  
>
>>I am curious to know how you have set the Linux box, AW and the
>>    
>>
>VNCserver.
>  
>
>>I like the cost savings achieved by using Linux and VNC.
>>    
>>
>
>I would like to keep the discussion on-list, but feel free to contact
>me privately if you need.
>
>I have the Linux act as the X-Windows gateway to an AW that has extra
>DM's available. The first step is to make sure that you can get an
>X-Windows session on the Linux box to start a DM from the AW for a
>specific user. I do this with a .xsession script on the Linux box that
>uses rexec to run a script on the AW to send the DM to the Linux box.
>Test this by logging in locally on the Linux box and see if the DM
>starts. I have script already written for both the Linux box and AW
>that I know work if you want them. I use a light-weight window manager
>that is locked down tight called IceWM. Any window manager would work
>as long as you can secure it (Gnome or KDE), but light-weight is
>better (NOT Gnome or KDE). I also have XDM set to be the login
>manager. I then installed the VNC server. 
> 
>On Linux the VNC sever acts differently that on Windows. 
>Instead of taking over the local display, it actually spawns an
>X-Windows session. 
> 
>So with the VNC server
>installed and configured to run from xinetd, you can login as the
>above configured user via a VNC client to startup the remote DM. It
>sounds complicated, but is pretty easy when taken in steps.
>
>I have the autologoff program from the Cassandra site setup to
>shuttoff the DM after 30 min of no activity and the VNC server setup
>to shutdown the VNC session after 45 min of no activity. That way the
>DM is shutdown cleanly (leaving no open lists) and no stale
>connections are left up. This helps greatly with users who open up a
>session, but then never close it.
>
>I also use xtrap to record each session to disk for security and
>troubleshooting. This allows any session to be replayed at a later
>date. I log each start and stop on both the AW and the Linux box.
>
>Anyone have any questions?
>
>--
>Patron saints in general are broadband connections to the Almighty
>- Michelle Delio, Wired News
>
>
>
> 
> 
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> 
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>  
>
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