Howto use standalone engine in clustering! (The linux answer I found)

[Pierre Sahores]

Wouaw !!!

What an incredibule usefull piece of code, Kevin ! Thanks, thanks, 
thanks,.. :)

Best Regards, Pierre

Le 10 mars 04, à 23:54, Kevin a écrit :

>
>
> Okay, here is my 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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-- 
Bien cordialement, Pierre Sahores

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