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"

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	#!/bin/bash
2
3	# based on Tony Risinger code from lxc-users
4	# http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html
5
6	which inotifywait >/dev/null \|\| apt-get install inotify-tools
7
8	name=$1
9
10	if [ ! -e /var/lib/lxc/$name/config ] ; then
11	echo "Usage: $0 name"
12	ls /var/lib/lxc/*/config \| cut -d/ -f5
13	exit 1
14	fi
15
16	rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config \| cut -d= -f2`
17	echo "$name rootfs $rootfs"
18
19	lxc-info -n $name \| grep RUNNING \|\| lxc-start -d -n $name -o /tmp/${name}.log && echo "$name start"
20
21	while true; do
22	# time of 5 minutes on it JUST IN CASE...
23	vps_utmp=${rootfs}/var/run/utmp
24	inotifywait -qqt 300 ${vps_utmp}
25	if [ $(wc -l < /cgroup/${name}/tasks) -eq 1 ]; then
26
27	runlevel="$(runlevel ${vps_utmp})"
28	echo "# $name runlevel $runlevel"
29
30	case $runlevel in
31	N*)
32	# nothing for new boot state
33	;;
34	??0)
35	echo "$name halt"
36	lxc-stop -n "${name}"
37	break
38	;;
39	??6)
40	echo "$name reboot";
41	lxc-stop -n ${name}
42	lxc-wait -n ${name} -s STOPPED
43	mount /mnt/llin -o remount,rw
44	lxc-start -d -n ${name} -o /tmp/${name}.log
45	;;
46	*)
47	# make sure vps is still running
48	state="$(lxc-info -n "${name}" \| sed -e 's/.* is //')"
49	[ "$state" = "RUNNING" ] \|\| break
50	;;
51	esac
52	fi
53	done
54