/[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!
ViewVC logotype

Contents of /recepies/lxc/lxc-watchdog.sh

Parent Directory Parent Directory | Revision Log Revision Log


Revision 232 - (show annotations)
Sun Oct 24 11:55:02 2010 UTC (13 years, 6 months ago) by dpavlin
File MIME type: application/x-sh
File size: 5336 byte(s)
extract lxc_hostname and lxc_ip into functions
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 | cut -d= -f2 ||
51 grep address $(lxc_rootfs $name)/etc/network/interfaces | sed 's/.*address //'
52 }
53
54 lxc_status() {
55 ( find /var/lib/lxc/ -name "config" | cut -d/ -f5 | sort -u | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do
56 boot="-"
57 test -s /var/lib/lxc/$name/on_boot && boot="boot"
58 echo "$name $status $boot $(lxc_rootfs $name) $(lxc_ip $name) $(lxc_hostname $name)"
59 done ) | column -t
60 }
61
62
63 cleanup_init_scripts() {
64 rootfs=$(lxc_rootfs $1)
65
66 ls \
67 $rootfs/etc/rc?.d/*umountfs \
68 $rootfs/etc/rc?.d/*umountroot \
69 $rootfs/etc/rc?.d/*hwclock* \
70 $rootfs/etc/rc?.d/*udev* \
71 2>/dev/null | xargs -i rm -v {}
72
73 echo $1 > $rootfs/etc/hostname
74 }
75
76
77 setup_inittab() {
78 rootfs=$(lxc_rootfs $1)
79 remove=$2
80 add=$3
81
82 # let container respond to kill -SIGPWR
83 inittab=$rootfs/etc/inittab
84 if test -e $inittab && ! grep "$add" ${inittab} >/dev/null ; then
85 grep -v "$remove" ${inittab} > ${inittab}.new
86 echo $add >> ${inittab}.new
87 mv ${inittab}.new ${inittab}
88 echo "$inittab modified with $add"
89 fi
90 }
91
92
93 lxc_log() {
94 echo `date +%Y-%m-%dT%H:%M:%S` $*
95 }
96
97
98 lxc_kill() {
99 name=$1
100 sig=$2
101
102 init_pid=`lxc-ps -C init -o pid | grep "^$name" | cut -d" " -f2-`
103 if [ -z "$init_pid" ] ; then
104 lxc-info -n $name
105 exit 1
106 fi
107 lxc_log "$name kill $sig $init_pid"
108 /bin/kill $sig $init_pid
109 }
110
111 lxc_stop() {
112 lxc_log "$name stop"
113 lxc_kill $name -SIGPWR
114 lxc-wait -n $name -s STOPPED
115 lxc_log "$name stoped"
116 # rm -f /var/lib/lxc/${name}/on_boot
117 }
118
119
120 lxc_start() {
121 name=$1
122 rootfs=$(lxc_rootfs $1)
123
124 if [ ! -e $rootfs ] ; then
125 echo "ERROR $name rootfs $rootfs not found"
126 return
127 fi
128
129 if ! lxc-info -n $name | grep RUNNING ; then
130 lxc_log "$name start"
131 lxc-start -n $name -o /tmp/${name}.log -d
132 lxc-wait -n $name -s RUNNING
133 lxc-info -n $name
134 test -f /var/lib/lxc/${name}/on_boot || echo $name > /var/lib/lxc/${name}/on_boot
135 fi
136 }
137
138 lxc_watchdog() {
139 name=$1
140 rootfs=$(lxc_rootfs $1)
141
142 while true; do
143 vps_utmp=${rootfs}/var/run/utmp
144 tasks=`wc -l < /cgroup/${name}/tasks`
145 test -z "$tasks" && exit 1
146 if [ "$tasks" -eq 1 ]; then
147
148 runlevel="$(runlevel ${vps_utmp})"
149 lxc_log "$name runlevel $runlevel"
150
151 case $runlevel in
152 N*)
153 # nothing for new boot state
154 ;;
155 ??0)
156 lxc_log "$name halt"
157 lxc-stop -n "${name}"
158 lxc-wait -n ${name} -s STOPPED
159 break
160 ;;
161 ??6)
162 lxc_log "$name reboot";
163 lxc-stop -n ${name}
164 lxc-wait -n ${name} -s STOPPED
165 lxc-start -d -n ${name} -o /tmp/${name}.log
166 ;;
167 *)
168 # make sure vps is still running
169 state="$(lxc-info -n "${name}" | sed -e 's/.* is //')"
170 [ "$state" = "RUNNING" ] || break
171 ;;
172 esac
173 else
174 lxc_log "$name $tasks tasks"
175 fi
176
177 # time of 5 minutes on it JUST IN CASE...
178 inotifywait -qqt 300 ${vps_utmp}
179 done
180
181 lxc_log "$name watchdog exited"
182
183 }
184
185
186 usage() {
187 echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2
188 exit 3
189 }
190
191 command_on_lxc() {
192 command=$1
193 shift
194
195 echo "# $command $1"
196
197 case "$command" in
198
199 start)
200 lxc_exists $1
201 cleanup_init_scripts $1
202 setup_inittab $1 ":respawn:/sbin/getty.*tty1" "c1:12345:respawn:/sbin/getty 38400 tty1 linux"
203 setup_inittab $1 "::power" "p0::powerfail:/sbin/init 0"
204 setup_inittab $1 "::ctrlaltdel" "p6::ctrlaltdel:/sbin/init 6"
205 lxc_start $1
206 # give container 5 seconds to start more than one process
207 ( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) &
208 ;;
209 stop|halt)
210 lxc_exists $1
211 lxc_stop $1
212 ;;
213 reload|force-reload|restart|reboot)
214 lxc_kill $1 -SIGINT
215 ;;
216 watchdog)
217 lxc_watchdog $1
218 ;;
219 boot)
220 echo $1 > /var/lib/lxc/$1/on_boot
221 ;;
222 disable)
223 echo -n > /var/lib/lxc/$1/on_boot
224 ;;
225 *)
226 usage
227 ;;
228
229 esac
230
231 }
232
233 command=$1
234 test -z "$command" && usage
235 test "$command" = "status" && lxc_status && exit
236 shift
237
238 if [ -z "$1" ] ; then
239 ls /var/lib/lxc/*/on_boot | while read path ; do
240 name=`echo $path | cut -d/ -f5`
241 if [ "$command" != "start" -o "$command" = "start" -a -s $path ] ; then
242 command_on_lxc $command $name
243 else
244 echo "# skip $command $name"
245 fi
246 done
247 else
248 while [ ! -z "$1" ] ; do
249 command_on_lxc $command $1
250 shift
251 done
252 fi
253

Properties

Name Value
svn:executable *

  ViewVC Help
Powered by ViewVC 1.1.26