| 1 |
#! /bin/sh |
| 2 |
### BEGIN INIT INFO |
| 3 |
# Provides: lxc-watchdog |
| 4 |
# Required-Start: $remote_fs $named $network $time |
| 5 |
# Required-Stop: $remote_fs $named $network |
| 6 |
# Required-Start: |
| 7 |
# Required-Stop: |
| 8 |
# Default-Start: 2 3 4 5 |
| 9 |
# Default-Stop: 0 1 6 |
| 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 |
| 13 |
### END INIT INFO |
| 14 |
|
| 15 |
# Author: Dobrica Pavlinusic <dpavlin@rot13.org> |
| 16 |
# |
| 17 |
# based on Tony Risinger post to lxc-users mailing list |
| 18 |
# http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html |
| 19 |
# |
| 20 |
# Install with: |
| 21 |
# ln -sf /srv/sysadmin-cookbook/recepies/lxc/lxc-watchdog.sh /etc/init.d/lxc-watchdog |
| 22 |
# update-rc.d lxc-watchdog defaults |
| 23 |
|
| 24 |
|
| 25 |
which inotifywait >/dev/null || apt-get install inotify-tools |
| 26 |
|
| 27 |
|
| 28 |
lxc_exists() { |
| 29 |
name=$1 |
| 30 |
|
| 31 |
if [ ! -e /var/lib/lxc/$name/config ] ; then |
| 32 |
echo "Usage: $0 name" |
| 33 |
lxc_status |
| 34 |
exit 1 |
| 35 |
fi |
| 36 |
} |
| 37 |
|
| 38 |
|
| 39 |
lxc_rootfs() { |
| 40 |
grep '^ *lxc\.rootfs *=' "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//' |
| 41 |
} |
| 42 |
|
| 43 |
lxc_hostname() { |
| 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]"; |
| 47 |
} |
| 48 |
|
| 49 |
lxc_ip() { |
| 50 |
( grep lxc.network.ipv4 /var/lib/lxc/$name/config | grep -v '^#' | cut -d= -f2 || \ |
| 51 |
grep address $(lxc_rootfs $name)/etc/network/interfaces | grep -v '^#' | sed 's/.*address //' ) | \ |
| 52 |
head -1 | \ |
| 53 |
sed -e 's/ *//g' -e 's/\/.*$//' |
| 54 |
} |
| 55 |
|
| 56 |
lxc_status() { |
| 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 $name | sed -e 's/^.* is //'` # 0.7.2 |
| 60 |
boot="-" |
| 61 |
test -s /var/lib/lxc/$name/on_boot && boot="boot" |
| 62 |
echo "$name $status $boot $(lxc_rootfs $name) $(lxc_ip $name) $(lxc_hostname $name)" |
| 63 |
done ) | column -t |
| 64 |
} |
| 65 |
|
| 66 |
|
| 67 |
cleanup_init_scripts() { |
| 68 |
rootfs=$(lxc_rootfs $1) |
| 69 |
|
| 70 |
ls \ |
| 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 {} |
| 78 |
|
| 79 |
echo $1 > $rootfs/etc/hostname |
| 80 |
grep $1 $rootfs/etc/hosts || echo "$(lxc_ip $1) $1" >> $rootfs/etc/hosts |
| 81 |
} |
| 82 |
|
| 83 |
|
| 84 |
setup_inittab() { |
| 85 |
rootfs=$(lxc_rootfs $1) |
| 86 |
remove=$2 |
| 87 |
add=$3 |
| 88 |
|
| 89 |
# let container respond to kill -SIGPWR |
| 90 |
inittab=$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" |
| 96 |
fi |
| 97 |
} |
| 98 |
|
| 99 |
|
| 100 |
lxc_log() { |
| 101 |
echo `date +%Y-%m-%dT%H:%M:%S` $* |
| 102 |
} |
| 103 |
|
| 104 |
|
| 105 |
lxc_kill() { |
| 106 |
name=$1 |
| 107 |
sig=$2 |
| 108 |
|
| 109 |
ver=`lxc-version | cut -d: -f2 | sed 's/\.//g'` |
| 110 |
opts='' |
| 111 |
test $ver -ge 075 && opts='--' |
| 112 |
|
| 113 |
init_pid=`lxc-ps $opts -C init -o pid | grep "^$name" | cut -d" " -f2-` |
| 114 |
if [ -z "$init_pid" ] ; then |
| 115 |
lxc-info -n $name |
| 116 |
exit 1 |
| 117 |
fi |
| 118 |
lxc_log "$name kill $sig $init_pid" |
| 119 |
/bin/kill $sig $init_pid |
| 120 |
} |
| 121 |
|
| 122 |
lxc_stop() { |
| 123 |
lxc_log "$name stop" |
| 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 |
| 128 |
} |
| 129 |
|
| 130 |
|
| 131 |
lxc_start() { |
| 132 |
name=$1 |
| 133 |
rootfs=$(lxc_rootfs $1) |
| 134 |
|
| 135 |
if [ ! -e $rootfs ] ; then |
| 136 |
echo "ERROR $name rootfs $rootfs not found" |
| 137 |
return |
| 138 |
fi |
| 139 |
|
| 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 |
| 146 |
lxc-info -n $name |
| 147 |
test -f /var/lib/lxc/${name}/on_boot || echo $name > /var/lib/lxc/${name}/on_boot |
| 148 |
fi |
| 149 |
} |
| 150 |
|
| 151 |
lxc_watchdog() { |
| 152 |
name=$1 |
| 153 |
cgroup=$(mount -t cgroup | awk '{ print $3 }') |
| 154 |
test -d "$cgroup/lxc/$1" && cgroup="$cgroup/lxc" |
| 155 |
rootfs=$(lxc_rootfs $1) |
| 156 |
run=$rootfs/var/run |
| 157 |
test -L $run && run=$rootfs/`readlink $run` # recent Debian have symlink to /run |
| 158 |
cd $run || echo "can't cd watchdog into $run" |
| 159 |
|
| 160 |
while true; do |
| 161 |
tasks=`wc -l < $cgroup/${name}/tasks` |
| 162 |
stop_on=1 # init |
| 163 |
sulogins=`lxc-ps --name $name | grep sulogin | wc -l` |
| 164 |
if [ "$sulogins" -gt 0 ] ; then |
| 165 |
stop_on=`expr $stop_on + $sulogins` |
| 166 |
fi |
| 167 |
|
| 168 |
test -z "$tasks" && exit 1 |
| 169 |
if [ "$tasks" -eq $stop_on ]; then |
| 170 |
|
| 171 |
runlevel="$(runlevel utmp)" |
| 172 |
lxc_log "$name runlevel $runlevel" |
| 173 |
|
| 174 |
case $runlevel in |
| 175 |
N*) |
| 176 |
# nothing for new boot state |
| 177 |
;; |
| 178 |
??0|unknown) |
| 179 |
lxc_log "$name halt" |
| 180 |
lxc-stop -n "${name}" |
| 181 |
lxc-wait -n ${name} -s STOPPED |
| 182 |
break |
| 183 |
;; |
| 184 |
??6) |
| 185 |
lxc_log "$name reboot"; |
| 186 |
lxc-stop -n ${name} |
| 187 |
lxc-wait -n ${name} -s STOPPED |
| 188 |
lxc-start -d -n ${name} -o /tmp/${name}.log |
| 189 |
;; |
| 190 |
*) |
| 191 |
# make sure vps is still running |
| 192 |
state="$(lxc-info -n "${name}" | sed -e 's/.* is //')" |
| 193 |
[ "$state" = "RUNNING" ] || break |
| 194 |
;; |
| 195 |
esac |
| 196 |
else |
| 197 |
lxc_log "$name $tasks tasks $sulogins console" |
| 198 |
fi |
| 199 |
|
| 200 |
# time of 5 minutes on it JUST IN CASE... |
| 201 |
inotifywait -qqt 300 utmp |
| 202 |
done |
| 203 |
|
| 204 |
lxc_log "$name watchdog exited" |
| 205 |
|
| 206 |
} |
| 207 |
|
| 208 |
|
| 209 |
usage() { |
| 210 |
echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2 |
| 211 |
exit 3 |
| 212 |
} |
| 213 |
|
| 214 |
command_on_lxc() { |
| 215 |
command=$1 |
| 216 |
shift |
| 217 |
|
| 218 |
echo "# $command $1" |
| 219 |
|
| 220 |
case "$command" in |
| 221 |
|
| 222 |
start) |
| 223 |
lxc_exists $1 |
| 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" |
| 228 |
lxc_start $1 |
| 229 |
# give container 5 seconds to start more than one process |
| 230 |
( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) & |
| 231 |
;; |
| 232 |
stop|halt) |
| 233 |
lxc_exists $1 |
| 234 |
lxc_stop $1 |
| 235 |
;; |
| 236 |
reload|force-reload|restart|reboot) |
| 237 |
lxc_kill $1 -SIGINT |
| 238 |
;; |
| 239 |
watchdog) |
| 240 |
lxc_watchdog $1 |
| 241 |
;; |
| 242 |
boot) |
| 243 |
echo $1 > /var/lib/lxc/$1/on_boot |
| 244 |
;; |
| 245 |
disable) |
| 246 |
echo -n > /var/lib/lxc/$1/on_boot |
| 247 |
;; |
| 248 |
*) |
| 249 |
usage |
| 250 |
;; |
| 251 |
|
| 252 |
esac |
| 253 |
|
| 254 |
} |
| 255 |
|
| 256 |
command=$1 |
| 257 |
test -z "$command" && usage |
| 258 |
test "$command" = "status" && lxc_status && exit |
| 259 |
shift |
| 260 |
|
| 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 |
| 266 |
else |
| 267 |
echo "# skip $command $name" |
| 268 |
fi |
| 269 |
done |
| 270 |
else |
| 271 |
while [ ! -z "$1" ] ; do |
| 272 |
command_on_lxc $command $1 |
| 273 |
shift |
| 274 |
done |
| 275 |
fi |
| 276 |
|
Parent Directory
| 
Revision Log