/[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 264 - (show annotations)
Sun Jun 26 15:00:40 2011 UTC (12 years, 9 months ago) by root
File MIME type: application/x-sh
File size: 5962 byte(s)
recent Debian has /var/run as symlink

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 | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do
58 boot="-"
59 test -s /var/lib/lxc/$name/on_boot && boot="boot"
60 echo "$name $status $boot $(lxc_rootfs $name) $(lxc_ip $name) $(lxc_hostname $name)"
61 done ) | column -t
62 }
63
64
65 cleanup_init_scripts() {
66 rootfs=$(lxc_rootfs $1)
67
68 ls \
69 $rootfs/etc/rc?.d/*checkroot* \
70 $rootfs/etc/rc?.d/*umountfs \
71 $rootfs/etc/rc?.d/*umountroot \
72 $rootfs/etc/rc?.d/*hwclock* \
73 $rootfs/etc/rc?.d/*udev* \
74 $rootfs/etc/rc?.d/*checkfs* \
75 2>/dev/null | xargs -i rm -v {}
76
77 echo $1 > $rootfs/etc/hostname
78 grep $1 $rootfs/etc/hosts || echo "$(lxc_ip $1) $1" >> $rootfs/etc/hosts
79 }
80
81
82 setup_inittab() {
83 rootfs=$(lxc_rootfs $1)
84 remove=$2
85 add=$3
86
87 # let container respond to kill -SIGPWR
88 inittab=$rootfs/etc/inittab
89 if test -e $inittab && ! grep "$add" ${inittab} >/dev/null ; then
90 grep -v "$remove" ${inittab} > ${inittab}.new
91 echo $add >> ${inittab}.new
92 mv ${inittab}.new ${inittab}
93 echo "$inittab modified with $add"
94 fi
95 }
96
97
98 lxc_log() {
99 echo `date +%Y-%m-%dT%H:%M:%S` $*
100 }
101
102
103 lxc_kill() {
104 name=$1
105 sig=$2
106
107 init_pid=`lxc-ps -C init -o pid | grep "^$name" | cut -d" " -f2-`
108 if [ -z "$init_pid" ] ; then
109 lxc-info -n $name
110 exit 1
111 fi
112 lxc_log "$name kill $sig $init_pid"
113 /bin/kill $sig $init_pid
114 }
115
116 lxc_stop() {
117 lxc_log "$name stop"
118 lxc_kill $name -SIGPWR
119 lxc-wait -n $name -s STOPPED
120 lxc_log "$name stoped"
121 # rm -f /var/lib/lxc/${name}/on_boot
122 }
123
124
125 lxc_start() {
126 name=$1
127 rootfs=$(lxc_rootfs $1)
128
129 if [ ! -e $rootfs ] ; then
130 echo "ERROR $name rootfs $rootfs not found"
131 return
132 fi
133
134 if ! lxc-info -n $name | grep RUNNING ; then
135 lxc_log "$name start"
136 dev=`df -P $rootfs | tail -1 | cut -d" " -f1`
137 mount $dev -o remount,rw # fix debian upgrade which remounts dir ro
138 lxc-start -n $name -o /tmp/${name}.log -d
139 lxc-wait -n $name -s RUNNING
140 lxc-info -n $name
141 test -f /var/lib/lxc/${name}/on_boot || echo $name > /var/lib/lxc/${name}/on_boot
142 fi
143 }
144
145 lxc_watchdog() {
146 name=$1
147 rootfs=$(lxc_rootfs $1)
148 run=$rootfs/var/run
149 test -L $run && run=$rootfs/`readlink $run` # recent Debian have symlink to /run
150 cd $run || echo "can't cd watchdog into $run"
151
152 while true; do
153 tasks=`wc -l < /cgroup/${name}/tasks`
154 stop_on=1 # init
155 sulogins=`lxc-ps --name $name | grep sulogin | wc -l`
156 if [ "$sulogins" -gt 0 ] ; then
157 stop_on=`expr $stop_on + $sulogins`
158 fi
159
160 test -z "$tasks" && exit 1
161 if [ "$tasks" -eq $stop_on ]; then
162
163 runlevel="$(runlevel utmp)"
164 lxc_log "$name runlevel $runlevel"
165
166 case $runlevel in
167 N*)
168 # nothing for new boot state
169 ;;
170 ??0|unknown)
171 lxc_log "$name halt"
172 lxc-stop -n "${name}"
173 lxc-wait -n ${name} -s STOPPED
174 break
175 ;;
176 ??6)
177 lxc_log "$name reboot";
178 lxc-stop -n ${name}
179 lxc-wait -n ${name} -s STOPPED
180 lxc-start -d -n ${name} -o /tmp/${name}.log
181 ;;
182 *)
183 # make sure vps is still running
184 state="$(lxc-info -n "${name}" | sed -e 's/.* is //')"
185 [ "$state" = "RUNNING" ] || break
186 ;;
187 esac
188 else
189 lxc_log "$name $tasks tasks $sulogins console"
190 fi
191
192 # time of 5 minutes on it JUST IN CASE...
193 inotifywait -qqt 300 utmp
194 done
195
196 lxc_log "$name watchdog exited"
197
198 }
199
200
201 usage() {
202 echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2
203 exit 3
204 }
205
206 command_on_lxc() {
207 command=$1
208 shift
209
210 echo "# $command $1"
211
212 case "$command" in
213
214 start)
215 lxc_exists $1
216 cleanup_init_scripts $1
217 setup_inittab $1 ":respawn:/sbin/getty.*tty1" "c1:12345:respawn:/sbin/getty 38400 tty1 linux"
218 setup_inittab $1 "::power" "p0::powerfail:/sbin/init 0"
219 setup_inittab $1 "::ctrlaltdel" "p6::ctrlaltdel:/sbin/init 6"
220 lxc_start $1
221 # give container 5 seconds to start more than one process
222 ( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) &
223 ;;
224 stop|halt)
225 lxc_exists $1
226 lxc_stop $1
227 ;;
228 reload|force-reload|restart|reboot)
229 lxc_kill $1 -SIGINT
230 ;;
231 watchdog)
232 lxc_watchdog $1
233 ;;
234 boot)
235 echo $1 > /var/lib/lxc/$1/on_boot
236 ;;
237 disable)
238 echo -n > /var/lib/lxc/$1/on_boot
239 ;;
240 *)
241 usage
242 ;;
243
244 esac
245
246 }
247
248 command=$1
249 test -z "$command" && usage
250 test "$command" = "status" && lxc_status && exit
251 shift
252
253 if [ -z "$1" ] ; then
254 ls /var/lib/lxc/*/on_boot | while read path ; do
255 name=`echo $path | cut -d/ -f5`
256 if [ "$command" != "start" -o "$command" = "start" -a -s $path ] ; then
257 command_on_lxc $command $name
258 else
259 echo "# skip $command $name"
260 fi
261 done
262 else
263 while [ ! -z "$1" ] ; do
264 command_on_lxc $command $1
265 shift
266 done
267 fi
268

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