Question about Rev app on remote X11.

Richard Gaskin ambassador at fourthworld.com
Tue Aug 17 01:30:52 EDT 2004


Great info. Have you added that to the feature requests in Bugzilla?

-- 
  Richard Gaskin
  Fourth World Media Corporation
  ___________________________________________________________
  Ambassador at FourthWorld.com       http://www.FourthWorld.com


K wrote:

> Below is a posting I sent some time ago in reference to using RR stand-alones in a cluster environment.  A RR stand-alone should observe the $DISPALY environment variable and if envoked from a remote termial display on that terminal. Another alterative is to use the "--display" commmand line parameter (shown below) which will cause the stad-alone to ignore the $DISPLAY environment variable and use the specified display.
> 
> 
> Kevin
> 
> =============================================================================
> ORGINAL POSTING
> =============================================================================
> 
> 
> 
> Cluster GUI
> 
> solution it is messy but gets the job done.
> 
> Create a user with very little access for my purposes I will call it 'clustergui'. 
> 
> Manually execute vncserver and set the vnc password to something very secure!
> 
> Create a init.d script (or use the one below) to initialize a vncserver secession (protected by local firewall) for user 'clustergui'.  
> 
> Add 127.0.0.1 aka locahost to your system xhost (this gives 127.0.0.1 aka localhost the right to mount the gui you just created).
> 
> Execute the program like so:
> 
> rrprogram -display 127.0.0.1:<display#> 
> 
> Note: You can set the DISPLAY environment varaible to 127.0.0.1:<display#> for entire cluster.
> 
> Because the firewall is protecting the VNC secession (preventing anyone from connecting) the secession will utilize little processor.  I also configured the ~/.vnc/xstartup to use 'twm' as the window manager (significantly lowering the memory foot-print).  Using it in this manner allows ALL GUI applications to have a X secession (not just RR standalones).  In fact I am now using matlab with bitmap function (which require X) on my cluster.
> 
> I am also using this method for my cron/console (dual mode) execution.
> 
> The scripts I used to create the secession is below.
> 
> Hope this is helpful,
> 
> Kevin
> 
> 
> 
> #!/bin/bash
> #
> # chkconfig: - 91 35
> # description: Starts and stops vncserver. \
> #              used to provide remote X administration services.
> 
> # Source function library.
> . /etc/init.d/functions
> 
> # Source networking configuration.
> . /etc/sysconfig/network
> 
> # Check that networking is up.
> [ ${NETWORKING} = "no" ] && exit 0
> 
> VNCSERVERS=""
> [ -f /etc/sysconfig/vncservers ] && . /etc/sysconfig/vncservers
> 
> prog=$"VNC server"
> 
> start() {
>     echo -n $"Starting $prog: "
>     ulimit -S -c 0 >/dev/null 2>&1
>     RETVAL=0
>     for display in ${VNCSERVERS}
>     do
>         echo -n "${display} "
>         unset BASH_ENV ENV
>         initlog $INITLOG_ARGS -c \
>             "su ${display##*:} -l -c \"cd ~${display##*:} && [ -f .vnc/passwd ] && vncserver :${display%%:*}\""
>         RETVAL=$?
>         [ "$RETVAL" -ne 0 ] && break
>     done
>     [ "$RETVAL" -eq 0 ] && success $"vncserver startup" || \
>         failure $"vncserver start"
>     echo
>     [ "$RETVAL" -eq 0 ] && touch /var/lock/subsys/vncserver
> }
> 
> stop() {
>     echo -n $"Shutting down $prog: "
>     for display in ${VNCSERVERS}
>     do
>         echo -n "${display} "
>         unset BASH_ENV ENV
>         initlog $INITLOG_ARGS -c \
>             "su ${display##*:} -c \"vncserver -kill :${display%%:*}\" >/dev/null 2>&1"
>     done
>     RETVAL=$?
>     [ "$RETVAL" -eq 0 ] && success $"vncserver shutdown" || \
>         failure $"vncserver shutdown"
>     echo
>     [ "$RETVAL" -eq 0 ] && rm -f /var/lock/subsys/vncserver
> }
> 
> # See how we were called.
> case "$1" in
>   start)
>         start
>         ;;
>   stop)
>         stop
>         ;;
>   restart|reload)
>         stop
>         sleep 1
>         start
>         ;;
>   condrestart)
>         if [ -f /var/lock/subsys/vncserver ]; then
>             stop
>             start
>         fi
>         ;;
>   status)
>         status Xvnc
>         ;;
>   *)
>         echo $"Usage: $0 {start|stop|restart|condrestart|status}"
>         exit 1
> esac
> 
> --------------------
> Contents of /etc/sysconfig/vncservers:
> 
> # The VNCSERVERS variable is a list of display:user pairs.
> #
> # Uncomment the line below to start a VNC server on display :1
> # 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
> # URL:http://www.uk.research.att.com/vnc/sshvnc.html.
> 
> # VNCSERVERS="1:myusername"
> VNCSERVERS="100:clustergui"
> 
> -==-=-=-=-=-=-==-=-=-=-=-=-=-=-==-=-=-=-=-=-



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