Re: VNCServer configuration

Alex Pelts Mon, 18 Jun 2007 19:28:43 -0700

One can write web management front end that would start a server andpublish its screen number. Or maybe you can run bunch of them and tellusers which are free. With EE user can use their unix password to login.

It is all highly dependent on what users actually do. If theapplications are computation/graphics intensive you will bring down themachine in no time at all. If you already using vnc in such manner andjust want to separate user sessions you can use ssh to do the work for you.

Run say 10 servers on ports 5900 to 5909. Then for each user setup sshport forwarding where for each user ssh will forward on a different port- for first one localhost:5900 to host:5900, for second onelocalhost:5900 to host:5901, etc. Then all user will have to do is toconnect to localhost screen 1 with vnc and ssh will port forward to thecorrect port for that user. The only downside that it is not dynamic.

If you want something more dynamic, setup script that would start aserver, generate .vnc file and get it to user somehow. All user willhave to do is double-click on the file to connect to correct server.


Alex


bruce wrote:

Hi Mike.

Thanks for your reply. What you've described is pretty much what my team has
been doing for quite awhile. However, in an enterprise situation, I'm
considering something that doesn't require users to have to login via ssh,
or to really play with vnc session ids.

It appears that vnc with xdmcp might actually provide a way to accomplish
this. I'm also going to do some research with nx to see if it meets my
goals.

thanks



-----Original Message-----
From: Boger, Mike [mailto:[EMAIL PROTECTED]
Sent: Monday, June 18, 2007 3:38 PM
To: bruce
Cc: vnc-list@realvnc.com
Subject: RE: VNCServer configuration


Bruce-

We have our users start up their own vncservers. The user initially logs
into the machine (telnet, ssh, etc.) and issues a vncserver command:

vncserver -geometry 1024x768

They will then be given the following info:

***
Reading user's xstartup file

VNC Server Enterprise Edition E4.2.6 - built Jul 27 2006 10:19:03
Copyright (C) 2002-2006 RealVNC Ltd.
See http://www.realvnc.com for information on VNC.
Running applications in /home/mikeyb/.vnc/xstartup
Log file is /home/mikeyb/.vnc/happybox.domain.com:2.log

New desktop is happybox.domain.com:2

****

The user then can point his/her vncviewer to happybox.domain.com:2...
Depending on how the ~/.vnc/xstartup file reads, is which window manager
gets displayed. The first one to get on the machine will get :1, the
next :2, so on so forth. As Alex mentions, the load will depend on what
each user is doing. Keep an eye out on load. An overloaded machine is a
sure fire way to make you very popular.

****
Here is our default xstartup (we have RHEL and Solaris in our
environment):
****

#!/bin/sh

[ -r ${HOME}/.Xdefaults  ] && xrdb -merge ${HOME}/.Xdefaults
[ -r ${HOME}/.Xresources ] && xrdb -merge ${HOME}/.Xresources

vncconfig -nowin &
if [ "`uname`" = "Linux" ]
then
    /usr/bin/startkde &
else
    /usr/dt/bin/Xsession &
    sleep 30
    xset s blank
fi

****
Hope that this helps-
Best Regards-
Mike

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of bruce
Sent: Monday, June 18, 2007 1:31 PM
To: 'Alex Pelts'
Cc: vnc-list@realvnc.com
Subject: RE: VNCServer configuration

Alex...

From your scenario.

I start the server.
I have VNCServer as a service, which gets started when the server is
started.

A user goes to login, using VNC. How does the user know which port to
use?
How does the user know which user/passwd to use?

You're stating that every user should have the same user/passwd, which
implies that every user is also going to have the same desktop/state.

This doesn't sound right.

It was my understanding that each user should be able to essentially
have their own 'desktop' when lokking in/using vnc...



-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Alex Pelts
Sent: Monday, June 18, 2007 1:05 PM
To: bruce
Cc: vnc-list@realvnc.com
Subject: Re: VNCServer configuration


If any of the users is logged in other users will see what she/he is
doing. I am not sure if that is what you want. If you do, then setup vnc
server and give everyone the same password. That is it. There is no need
for port.

If you do not want this behavior then vnc is not for you. I do not know
any way to protect one user from another using vnc. The only way to use
vnc is for all users to see the same screen. It is not different for EE
vs free edition. There are some added features in EE like encryption and
better authentication.

You can also start multiple vnc servers one per user but this is too
resource intensive, just like running multiple X servers on one machine.

Alex

bruce wrote:

also, if this can't be accomplished with the open source vnc, can itbe handled using the enterprise version... i'm assuming it can,otherwise, vncserver/client is severley limited...
thanks


hi...

there's still a confusion.

i have a linux box:
i have vncserver running on the box
i want to have multiple users be able to remotely access the serverusing vnc
how can this be accomplished?
normally, you need to know the "port" in use for the vncserversession. if you have mulitple users, each user won't know the port touse when logging in.
also, how do you setup vncserver to use the underlying system

user/passwd...

thanks



-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Alex Pelts
Sent: Sunday, June 17, 2007 8:26 PM
To: bruce
Cc: vnc-list@realvnc.com
Subject: Re: VNCServer configuration
Vnc does not work like this. You will need to run multiple instancesof vnc server, which is X server. This will quickly bring performanceof your host down.
Vnc designed to access one instance of X server remotely it is nothing

like a windows terminal server as far as user environment is

concerned.

It is more like XP remote desktop.
With vnc EE you can use unix login facilities so your users will havesame password for vnc as they have for the rest of the system.
What ever you are trying to do is not efficient with vnc but it can be

done by starting multiple vnc servers and giving each user his own.

Alex

bruce wrote:
Hi..
I'm trying to figure out how to setup VNC Server on linux boxes, sothat

can have users login, who can then access their own instance of the
server.
This would require that they be able to log in without knowing theport before logging in... I don't want the user to mix their sessionwith the session of someone else... Also, how do i go aboutconfiguring the

system,

so the user can use their own system login user/passwd...

thanks
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Re: VNCServer configuration

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