recepies/lxc/lxc-watchdog.sh

#!/bin/bash

# based on Tony Risinger code from lxc-users
# http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html

which inotifywait >/dev/null || apt-get install inotify-tools

name=$1

if [ ! -e /var/lib/lxc/$name/config ] ; then
        echo "Usage: $0 name"
        ls /var/lib/lxc/*/config | cut -d/ -f5
        exit 1
fi

rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config | cut -d= -f2`
echo "$name rootfs $rootfs"

# cleanup init scripts which don't work in containers
ls $rootfs/etc/rc?.d/*umountfs 2>/dev/null | xargs -i rm -v {}
ls $rootfs/etc/rc?.d/*umountroot 2>/dev/null | xargs -i rm -v {}
ls $rootfs/etc/rc?.d/*hwclock* 2>/dev/null | xargs -i rm -v {}

lxc-info -n $name | grep RUNNING || lxc-start -d -n $name -o /tmp/${name}.log && echo "$name start"

while true; do
        # time of 5 minutes on it JUST IN CASE...
        vps_utmp=${rootfs}/var/run/utmp
        inotifywait -qqt 300 ${vps_utmp}
        if [ $(wc -l < /cgroup/${name}/tasks) -eq 1 ]; then

                runlevel="$(runlevel ${vps_utmp})"
                echo "# $name runlevel $runlevel"

                case $runlevel in
                N*)
                        # nothing for new boot state
                ;;
                ??0)
                        echo "$name halt"
                        lxc-stop -n "${name}"
                        break
                ;;
                ??6)
                        echo "$name reboot";
                        lxc-stop -n ${name}
                        lxc-wait -n ${name} -s STOPPED
                        mount /mnt/llin -o remount,rw
                        lxc-start -d -n ${name} -o /tmp/${name}.log
                ;;
                *)
                        # make sure vps is still running
                        state="$(lxc-info -n "${name}" | sed -e 's/.* is //')"
                        [ "$state" = "RUNNING" ] || break
                ;;
                esac
        fi
done

1	dpavlin	177	#!/bin/bash
2	root	175
3			# based on Tony Risinger code from lxc-users
4			# http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html
5
6	dpavlin	177	which inotifywait >/dev/null \|\| apt-get install inotify-tools
7	root	175
8	dpavlin	177	name=$1
9	root	175
10	dpavlin	177	if [ ! -e /var/lib/lxc/$name/config ] ; then
11			echo "Usage: $0 name"
12			ls /var/lib/lxc/*/config \| cut -d/ -f5
13			exit 1
14			fi
15	root	175
16			rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config \| cut -d= -f2`
17			echo "$name rootfs $rootfs"
18
19	dpavlin	178	# cleanup init scripts which don't work in containers
20			ls $rootfs/etc/rc?.d/*umountfs 2>/dev/null \| xargs -i rm -v {}
21			ls $rootfs/etc/rc?.d/*umountroot 2>/dev/null \| xargs -i rm -v {}
22			ls $rootfs/etc/rc?.d/hwclock 2>/dev/null \| xargs -i rm -v {}
23
24	dpavlin	177	lxc-info -n $name \| grep RUNNING \|\| lxc-start -d -n $name -o /tmp/${name}.log && echo "$name start"
25	root	175
26			while true; do
27			# time of 5 minutes on it JUST IN CASE...
28			vps_utmp=${rootfs}/var/run/utmp
29			inotifywait -qqt 300 ${vps_utmp}
30			if [ $(wc -l < /cgroup/${name}/tasks) -eq 1 ]; then
31
32			runlevel="$(runlevel ${vps_utmp})"
33			echo "# $name runlevel $runlevel"
34
35			case $runlevel in
36			N*)
37			# nothing for new boot state
38			;;
39			??0)
40			echo "$name halt"
41			lxc-stop -n "${name}"
42			break
43			;;
44			??6)
45			echo "$name reboot";
46			lxc-stop -n ${name}
47			lxc-wait -n ${name} -s STOPPED
48			mount /mnt/llin -o remount,rw
49			lxc-start -d -n ${name} -o /tmp/${name}.log
50			;;
51			*)
52			# make sure vps is still running
53			state="$(lxc-info -n "${name}" \| sed -e 's/.* is //')"
54			[ "$state" = "RUNNING" ] \|\| break
55			;;
56			esac
57			fi
58			done
59