/[sysadmin-cookbook]/recepies/lxc/lxc-watchdog.sh
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /recepies/lxc/lxc-watchdog.sh

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Revision 218 - (show annotations)
Mon Jun 14 12:13:14 2010 UTC (9 years, 4 months ago) by root
File MIME type: application/x-sh
File size: 4965 byte(s)
remove udev startup from container

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
44 lxc_status() {
45 ( find /var/lib/lxc/ -name "config" | cut -d/ -f5 | sort -u | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do
46 boot="-"
47 hostname=`cat $(lxc_rootfs $name)/etc/hostname`
48 ip=`grep address $(lxc_rootfs $name)/etc/network/interfaces | sed 's/.*address //'`
49 test -s /var/lib/lxc/$name/on_boot && boot="boot"
50 echo "$name $status $boot $(lxc_rootfs $name) $ip $hostname"
51 done ) | column -t
52 }
53
54
55 cleanup_init_scripts() {
56 rootfs=$(lxc_rootfs $1)
57
58 ls \
59 $rootfs/etc/rc?.d/*umountfs \
60 $rootfs/etc/rc?.d/*umountroot \
61 $rootfs/etc/rc?.d/*hwclock* \
62 $rootfs/etc/rc?.d/*udev* \
63 2>/dev/null | xargs -i rm -v {}
64 }
65
66
67 setup_inittab() {
68 rootfs=$(lxc_rootfs $1)
69 remove=$2
70 add=$3
71
72 # let container respond to kill -SIGPWR
73 inittab=$rootfs/etc/inittab
74 if ! grep "$add" ${inittab} >/dev/null ; then
75 grep -v "$remove" ${inittab} > ${inittab}.new
76 echo $add >> ${inittab}.new
77 mv ${inittab}.new ${inittab}
78 echo "$inittab modified with $add"
79 fi
80 }
81
82
83 lxc_log() {
84 echo `date +%Y-%m-%dT%H:%M:%S` $*
85 }
86
87
88 lxc_kill() {
89 name=$1
90 sig=$2
91
92 init_pid=`lxc-ps -C init -o pid | grep "^$name" | cut -d" " -f2-`
93 if [ -z "$init_pid" ] ; then
94 lxc-info -n $name
95 exit 1
96 fi
97 lxc_log "$name kill $sig $init_pid"
98 /bin/kill $sig $init_pid
99 }
100
101 lxc_stop() {
102 lxc_log "$name stop"
103 lxc_kill $name -SIGPWR
104 lxc-wait -n $name -s STOPPED
105 lxc_log "$name stoped"
106 # rm -f /var/lib/lxc/${name}/on_boot
107 }
108
109
110 lxc_start() {
111 name=$1
112
113 if ! lxc-info -n $name | grep RUNNING ; then
114 lxc_log "$name start"
115 lxc-start -n $name -o /tmp/${name}.log -d
116 lxc-wait -n $name -s RUNNING
117 lxc-info -n $name
118 test -f /var/lib/lxc/${name}/on_boot || echo $name > /var/lib/lxc/${name}/on_boot
119 fi
120 }
121
122 lxc_watchdog() {
123 name=$1
124 rootfs=$(lxc_rootfs $1)
125
126 while true; do
127 vps_utmp=${rootfs}/var/run/utmp
128 tasks=`wc -l < /cgroup/${name}/tasks`
129 test -z "$tasks" && exit 1
130 if [ "$tasks" -eq 1 ]; then
131
132 runlevel="$(runlevel ${vps_utmp})"
133 lxc_log "$name runlevel $runlevel"
134
135 case $runlevel in
136 N*)
137 # nothing for new boot state
138 ;;
139 ??0)
140 lxc_log "$name halt"
141 lxc-stop -n "${name}"
142 lxc-wait -n ${name} -s STOPPED
143 break
144 ;;
145 ??6)
146 lxc_log "$name reboot";
147 lxc-stop -n ${name}
148 lxc-wait -n ${name} -s STOPPED
149 lxc-start -d -n ${name} -o /tmp/${name}.log
150 ;;
151 *)
152 # make sure vps is still running
153 state="$(lxc-info -n "${name}" | sed -e 's/.* is //')"
154 [ "$state" = "RUNNING" ] || break
155 ;;
156 esac
157 else
158 lxc_log "$name $tasks tasks"
159 fi
160
161 # time of 5 minutes on it JUST IN CASE...
162 inotifywait -qqt 300 ${vps_utmp}
163 done
164
165 lxc_log "$name watchdog exited"
166
167 }
168
169
170 usage() {
171 echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2
172 exit 3
173 }
174
175 command_on_lxc() {
176 command=$1
177 shift
178
179 echo "# $command $1"
180
181 case "$command" in
182
183 start)
184 lxc_exists $1
185 cleanup_init_scripts $1
186 setup_inittab $1 ":respawn:/sbin/getty.*tty1" "c1:12345:respawn:/sbin/getty 38400 tty1 linux"
187 setup_inittab $1 "::power" "p0::powerfail:/sbin/init 0"
188 setup_inittab $1 "::ctrlaltdel" "p6::ctrlaltdel:/sbin/init 6"
189 lxc_start $1
190 # give container 5 seconds to start more than one process
191 ( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) &
192 ;;
193 stop|halt)
194 lxc_exists $1
195 lxc_stop $1
196 ;;
197 reload|force-reload|restart|reboot)
198 lxc_kill $1 -SIGINT
199 ;;
200 watchdog)
201 lxc_watchdog $1
202 ;;
203 boot)
204 echo $1 > /var/lib/lxc/$1/on_boot
205 ;;
206 disable)
207 echo -n > /var/lib/lxc/$1/on_boot
208 ;;
209 *)
210 usage
211 ;;
212
213 esac
214
215 }
216
217 command=$1
218 test -z "$command" && usage
219 test "$command" = "status" && lxc_status && exit
220 shift
221
222 if [ -z "$1" ] ; then
223 ls /var/lib/lxc/*/on_boot | while read path ; do
224 name=`echo $path | cut -d/ -f5`
225 if [ "$command" != "start" -o "$command" = "start" -a -s $path ] ; then
226 command_on_lxc $command $name
227 else
228 echo "# skip $command $name"
229 fi
230 done
231 else
232 while [ ! -z "$1" ] ; do
233 command_on_lxc $command $1
234 shift
235 done
236 fi
237

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