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 |
|