3 # Provides: lxc-watchdog
4 # Required-Start: $remote_fs $named $network $time
5 # Required-Stop: $remote_fs $named $network
8 # Default-Start: 2 3 4 5
10 # Short-Description: Manage Linux Containers startup/shutdown
11 # Description: Uses clever inotify hack to monitor container's
12 # halt/reboot events watching /var/run/utmp
15 # Author: Dobrica Pavlinusic <dpavlin@rot13.org>
17 # based on Tony Risinger post to lxc-users mailing list
18 # http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html
21 # ln -sf /srv/sysadmin-cookbook/recepies/lxc/lxc-watchdog.sh /etc/init.d/lxc-watchdog
22 # update-rc.d lxc-watchdog defaults
25 which inotifywait >/dev/null || apt-get install inotify-tools
31 if [ ! -e /var/lib/lxc/$name/config ] ; then
40 grep '^ *lxc\.rootfs *=' "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'
44 inside=`cat $(lxc_rootfs $1)/etc/hostname`
45 config=`grep lxc.utsname /var/lib/lxc/$name/config | cut -d= -f2`
46 echo "$config [$inside]";
50 ( grep lxc.network.ipv4 /var/lib/lxc/$name/config | grep -v '^#' | cut -d= -f2 || \
51 grep address $(lxc_rootfs $name)/etc/network/interfaces | grep -v '^#' | sed 's/.*address //' ) | \
53 sed -e 's/ *//g' -e 's/\/.*$//'
57 ( find /var/lib/lxc/ -name "config" | cut -d/ -f5 | sort -u | while read name ; do
58 status=`lxc-info -n $name 2>/dev/null | grep state: | cut -d: -f2` # 0.7.5
59 test -z "$status" && status=`lxc-info -n $name | sed -e 's/^.* is //'` # 0.7.2
61 test -s /var/lib/lxc/$name/on_boot && boot="boot"
62 echo "$name $status $boot $(lxc_rootfs $name) $(lxc_ip $name) $(lxc_hostname $name)"
67 cleanup_init_scripts() {
68 rootfs=$(lxc_rootfs $1)
71 $rootfs/etc/rc?.d/*checkroot* \
72 $rootfs/etc/rc?.d/*umountfs \
73 $rootfs/etc/rc?.d/*umountroot \
74 $rootfs/etc/rc?.d/*hwclock* \
75 $rootfs/etc/rc?.d/*udev* \
76 $rootfs/etc/rc?.d/*checkfs* \
77 2>/dev/null | xargs -i rm -v {}
79 echo $1 > $rootfs/etc/hostname
80 grep $1 $rootfs/etc/hosts || echo "$(lxc_ip $1) $1" >> $rootfs/etc/hosts
85 rootfs=$(lxc_rootfs $1)
89 # let container respond to kill -SIGPWR
90 inittab=$rootfs/etc/inittab
91 if test -e $inittab && ! grep "$add" ${inittab} >/dev/null ; then
92 grep -v "$remove" ${inittab} > ${inittab}.new
93 echo $add >> ${inittab}.new
94 mv ${inittab}.new ${inittab}
95 echo "$inittab modified with $add"
101 echo `date +%Y-%m-%dT%H:%M:%S` $*
109 ver=`lxc-version | cut -d: -f2 | sed 's/\.//g'`
111 test $ver -ge 075 && opts='--'
113 init_pid=`lxc-ps $opts -C init -o pid | grep "^$name" | cut -d" " -f2-`
114 if [ -z "$init_pid" ] ; then
118 lxc_log "$name kill $sig $init_pid"
119 /bin/kill $sig $init_pid
124 lxc_kill $name -SIGPWR
125 lxc-wait -n $name -s STOPPED
126 lxc_log "$name stoped"
127 # rm -f /var/lib/lxc/${name}/on_boot
133 rootfs=$(lxc_rootfs $1)
135 if [ ! -e $rootfs ] ; then
136 echo "ERROR $name rootfs $rootfs not found"
140 if ! lxc-info -n $name | grep RUNNING ; then
141 lxc_log "$name start"
142 dev=`df -P $rootfs | tail -1 | cut -d" " -f1`
143 mount $dev -o remount,rw # fix debian upgrade which remounts dir ro
144 lxc-start -n $name -o /tmp/${name}.log -d
145 lxc-wait -n $name -s RUNNING
147 test -f /var/lib/lxc/${name}/on_boot || echo $name > /var/lib/lxc/${name}/on_boot
153 cgroup=$(mount -t cgroup | awk '{ print $3 }')
154 test -d "$cgroup/lxc/$1" && cgroup="$cgroup/lxc"
155 rootfs=$(lxc_rootfs $1)
157 test -L $run && run=$rootfs/`readlink $run` # recent Debian have symlink to /run
158 cd $run || echo "can't cd watchdog into $run"
161 tasks=`wc -l < $cgroup/${name}/tasks`
163 sulogins=`lxc-ps --name $name | grep sulogin | wc -l`
164 if [ "$sulogins" -gt 0 ] ; then
165 stop_on=`expr $stop_on + $sulogins`
168 test -z "$tasks" && exit 1
169 if [ "$tasks" -eq $stop_on ]; then
171 runlevel="$(runlevel utmp)"
172 lxc_log "$name runlevel $runlevel"
176 # nothing for new boot state
180 lxc-stop -n "${name}"
181 lxc-wait -n ${name} -s STOPPED
185 lxc_log "$name reboot";
187 lxc-wait -n ${name} -s STOPPED
188 lxc-start -d -n ${name} -o /tmp/${name}.log
191 # make sure vps is still running
192 state="$(lxc-info -n "${name}" | sed -e 's/.* is //')"
193 [ "$state" = "RUNNING" ] || break
197 lxc_log "$name $tasks tasks $sulogins console"
200 # time of 5 minutes on it JUST IN CASE...
201 inotifywait -qqt 300 utmp
204 lxc_log "$name watchdog exited"
210 echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2
224 cleanup_init_scripts $1
225 setup_inittab $1 ":respawn:/sbin/getty.*tty1" "c1:12345:respawn:/sbin/getty 38400 tty1 linux"
226 setup_inittab $1 "::power" "p0::powerfail:/sbin/init 0"
227 setup_inittab $1 "::ctrlaltdel" "p6::ctrlaltdel:/sbin/init 6"
229 # give container 5 seconds to start more than one process
230 ( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) &
236 reload|force-reload|restart|reboot)
243 echo $1 > /var/lib/lxc/$1/on_boot
246 echo -n > /var/lib/lxc/$1/on_boot
257 test -z "$command" && usage
258 test "$command" = "status" && lxc_status && exit
261 if [ -z "$1" ] ; then
262 ls /var/lib/lxc/*/on_boot | while read path ; do
263 name=`echo $path | cut -d/ -f5`
264 if [ "$command" != "start" -o "$command" = "start" -a -s $path ] ; then
265 command_on_lxc $command $name
267 echo "# skip $command $name"
271 while [ ! -z "$1" ] ; do
272 command_on_lxc $command $1