UbuntuHelp:UbuntuLTSP/KillProcOnDisconnect

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https://help.ubuntu.com/community/UbuntuLTSP/KillProcOnDisconnect

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Kill remaining processes if the client is no longer reachable

This page is specific to Ubuntu versions 8.10

If you find this information applicable to additional versions/releases, please edit this page and modify this header to reflect that. Please also include any necessary modifications for this information to apply to the additional versions.

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On running some LTSP Clients on the floor of a school and people randomly powering off client machines we had the problem that some processes remaind running on the server. Sometimes that caused a further problem when the clients were powered on again and the automated login failed. The gnome-watchdog was no solution because the only application running is the webbrowser (Opera in this case). But i got a lot of information out of this scripts. thanks!

The Xsession script for the Kiosk

sudo vi $HOME/.xsession

#!/bin/sh
#!/bin/sh
# $HOME/.xsession file for all kiosk users.

# wait 2 seconds for dying watchdog script of an old session
# which is still running after a <Ctrl><Alt><Backspace>
sleep 2

xmodmap -e 'clear Lock'

# Start the watchdog
if [ -n "$LTSP_CLIENT" ] ; then
	[ -e /home/kiosk-watchdog.sh ] && /home/kiosk-watchdog.sh &
fi 

# Start Opera Browser for the kiosk
/usr/bin/opera -k \
	-kioskresetstation \
	-kioskwindows \
	-kioskbuttons \
	-nodownload \
	-noexit \
	-nokeys \
	-nomail \
	-nomaillinks \
	-nomenu \
	-nominmaxbuttons \
	-noprint \
	-nosave \
	-nosession \
	-resetonexit \
	http://www.roland.at \
	&
sleep 4

exec /usr/bin/metacity

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The watchdog script

sudo vi /home/kiosk-watchdog.sh

#!/bin/bash
#!/bin/bash
#
# Kill all processes which may be left after shutdown of a kiosk

set -x
PROG=`basename $0`

# do not run as root
if [ `id -u` -eq 0 ] ; then
	exit 1
fi

# run as long as we can ping the client machine we are running for
sleep 10
i=3
while [ $i -gt 0 ]  ; do

	sleep 1
	if ping -c1 -n $LTSP_CLIENT | grep "1 packets transmitted, 1 received" >/dev/null 2>&1 ; then
		i=2
	else
	        i=`expr $i-1`
	fi
	if ! last $USER | grep "still" >/dev/null 2>&1 ; then
#		echo ""  >/dev/null 2>&1	
#	else
		i=0
	fi
done

# kill all our processes after machine shutdown
# 1. try with -SIGTERM, except the process of this script
pkill -SIGTERM -U $USER -v -f $PROG >/dev/null 2>&1
sleep 2
# 2. do it the hard way with -SIGKILL
pkill -SIGKILL -U $USER -v -f $PROG >/dev/null 2>&1
sleep 1
# 3. a last try to kill everything what is left of us
pkill -U $USER >/dev/null 2>&1

do not forget to make it executable: sudo chmod o+x /home/kiosk-watchdog.sh

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