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 |
|
21 |
which inotifywait >/dev/null || apt-get install inotify-tools |
22 |
|
23 |
|
24 |
lxc_exists() { |
25 |
name=$1 |
26 |
|
27 |
if [ ! -e /var/lib/lxc/$name/config ] ; then |
28 |
echo "Usage: $0 name" |
29 |
lxc_status |
30 |
exit 1 |
31 |
fi |
32 |
} |
33 |
|
34 |
|
35 |
lxc_rootfs() { |
36 |
grep lxc.rootfs "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//' |
37 |
} |
38 |
|
39 |
|
40 |
lxc_status() { |
41 |
lxc-ls -1 | sort -u | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do |
42 |
on_boot=" " |
43 |
test -s /var/lib/lxc/$name/on_boot && on_boot="on_boot" |
44 |
echo "$name $status $on_boot $(lxc_rootfs $name)" |
45 |
done |
46 |
} |
47 |
|
48 |
|
49 |
cleanup_init_scripts() { |
50 |
rootfs=$(lxc_rootfs $1) |
51 |
|
52 |
ls \ |
53 |
$rootfs/etc/rc?.d/*umountfs \ |
54 |
$rootfs/etc/rc?.d/*umountroot \ |
55 |
$rootfs/etc/rc?.d/*hwclock* \ |
56 |
2>/dev/null | xargs -i rm -v {} |
57 |
} |
58 |
|
59 |
|
60 |
setup_inittab() { |
61 |
rootfs=$(lxc_rootfs $1) |
62 |
remove=$2 |
63 |
add=$3 |
64 |
|
65 |
# let container respond to kill -SIGPWR |
66 |
inittab=$rootfs/etc/inittab |
67 |
if ! grep "$add" ${inittab} >/dev/null ; then |
68 |
grep -v "$remove" ${inittab} > ${inittab}.new |
69 |
echo $add >> ${inittab}.new |
70 |
mv ${inittab}.new ${inittab} |
71 |
echo "$inittab modified with $add" |
72 |
fi |
73 |
} |
74 |
|
75 |
|
76 |
lxc_kill() { |
77 |
name=$1 |
78 |
sig=$2 |
79 |
|
80 |
init_pid=`lxc-ps -C init -o pid | grep "^$name" | cut -d" " -f2-` |
81 |
if [ -z "$init_pid" ] ; then |
82 |
lxc-info -n $name |
83 |
exit 1 |
84 |
fi |
85 |
echo "$name kill $sig $init_pid" |
86 |
/bin/kill $sig $init_pid |
87 |
} |
88 |
|
89 |
lxc_stop() { |
90 |
lxc_kill $name -SIGPWR |
91 |
lxc-wait -n $name -s STOPPED |
92 |
# rm -f /var/lib/lxc/${name}/on_boot |
93 |
} |
94 |
|
95 |
|
96 |
lxc_start() { |
97 |
name=$1 |
98 |
|
99 |
if ! lxc-info -n $name | grep RUNNING ; then |
100 |
echo "$name start" |
101 |
lxc-start -n $name -o /tmp/${name}.log -d |
102 |
lxc-wait -n $name -s RUNNING |
103 |
lxc-info -n $name |
104 |
test -f /var/lib/lxc/${name}/on_boot || echo $name > /var/lib/lxc/${name}/on_boot |
105 |
fi |
106 |
} |
107 |
|
108 |
lxc_log() { |
109 |
echo `date +%Y-%m-%dT%H:%M:%S` $* |
110 |
} |
111 |
|
112 |
lxc_watchdog() { |
113 |
name=$1 |
114 |
rootfs=$(lxc_rootfs $1) |
115 |
|
116 |
while true; do |
117 |
vps_utmp=${rootfs}/var/run/utmp |
118 |
tasks=`wc -l < /cgroup/${name}/tasks` |
119 |
test -z "$tasks" && exit 1 |
120 |
if [ "$tasks" -eq 1 ]; then |
121 |
|
122 |
runlevel="$(runlevel ${vps_utmp})" |
123 |
lxc_log "$name runlevel $runlevel" |
124 |
|
125 |
case $runlevel in |
126 |
N*) |
127 |
# nothing for new boot state |
128 |
;; |
129 |
??0) |
130 |
lxc_log "$name halt" |
131 |
lxc-stop -n "${name}" |
132 |
lxc-wait -n ${name} -s STOPPED |
133 |
break |
134 |
;; |
135 |
??6) |
136 |
lxc_log "$name reboot"; |
137 |
lxc-stop -n ${name} |
138 |
lxc-wait -n ${name} -s STOPPED |
139 |
lxc-start -d -n ${name} -o /tmp/${name}.log |
140 |
;; |
141 |
*) |
142 |
# make sure vps is still running |
143 |
state="$(lxc-info -n "${name}" | sed -e 's/.* is //')" |
144 |
[ "$state" = "RUNNING" ] || break |
145 |
;; |
146 |
esac |
147 |
else |
148 |
lxc_log "$name $tasks tasks" |
149 |
fi |
150 |
|
151 |
# time of 5 minutes on it JUST IN CASE... |
152 |
inotifywait -qqt 300 ${vps_utmp} |
153 |
done |
154 |
|
155 |
lxc_log "$name exited" |
156 |
|
157 |
} |
158 |
|
159 |
|
160 |
command_on_lxc() { |
161 |
command=$1 |
162 |
shift |
163 |
|
164 |
echo "# $command $1" |
165 |
|
166 |
case "$command" in |
167 |
|
168 |
start) |
169 |
lxc_exists $1 |
170 |
cleanup_init_scripts $1 |
171 |
setup_inittab $1 ::power "p0::powerfail:/sbin/init 0" |
172 |
setup_inittab $1 ::ctrlaltdel "p6::ctrlaltdel:/sbin/init 6" |
173 |
lxc_start $1 |
174 |
# give container 5 seconds to start more than one process |
175 |
( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) & |
176 |
;; |
177 |
stop|halt) |
178 |
lxc_exists $1 |
179 |
lxc_stop $1 |
180 |
;; |
181 |
reload|force-reload|restart|reboot) |
182 |
lxc_kill $1 -SIGINT |
183 |
;; |
184 |
watchdog) |
185 |
lxc_watchdog $1 |
186 |
;; |
187 |
*) |
188 |
echo "Usage: $0 {start|stop|restart|status}" >&2 |
189 |
exit 3 |
190 |
;; |
191 |
|
192 |
esac |
193 |
|
194 |
} |
195 |
|
196 |
command=$1 |
197 |
shift |
198 |
|
199 |
test "$command" = "status" && lxc_status && exit |
200 |
|
201 |
if [ -z "$1" ] ; then |
202 |
ls /var/lib/lxc/*/on_boot | while read path ; do |
203 |
name=`echo $path | cut -d/ -f5` |
204 |
command_on_lxc $command $name |
205 |
done |
206 |
else |
207 |
while [ ! -z "$1" ] ; do |
208 |
command_on_lxc $command $1 |
209 |
shift |
210 |
done |
211 |
fi |
212 |
|