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"
-==-=-=-=-=-=-==-=-=-=-=-=-=-=-==-=-=-=-=-=-
Disclaimer:
Any resemblance between the above views and those of my
employer, my terminal, or the view out my window are purely
coincidental.
Any resemblance between the above and my own views is non-deterministic.
The question of the existence of views in the absence of anyone to hold
them
is left as an exercise for the reader. The question of the existence of
the reader
is left as an exercise for the second god coefficient.
(A discussion of non-orthogonal, non-integral polytheism is beyond the
scope of this article.)
--- On Mon 08/16, Andre Garzia < [EMAIL PROTECTED] > wrote:
From: Andre Garzia [mailto: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Date: Mon, 16 Aug 2004 15:14:25 -0300
Subject: Question about Rev app on remote X11.
Hi Folks,<br><br>I am with a friend considering Rev for creating some special apps for
<br>an enterprize, the problem is, the app will run on server, and it <br>should be
displayed on remote xterminals. The dumb terminals got a <br>XFree86 running in there,
and the server will pipe the display there... <br>anyone tried running rev apps from
remote yet? Will I be the first one?<br><br>Cheers<br>andre<br>-- <br>Andre Alves
Garzia � 2004 �
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