/[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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Annotation of /recepies/lxc/lxc-watchdog.sh

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Revision 195 - (hide annotations)
Wed Mar 24 19:03:16 2010 UTC (14 years ago) by dpavlin
File MIME type: application/x-sh
File size: 4773 byte(s)
lxc-ls displays random files in /var/lib/lxc/ and duplicates so don't use it

1 dpavlin 184 #! /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 root 175
15 dpavlin 184 # Author: Dobrica Pavlinusic <dpavlin@rot13.org>
16 dpavlin 181 #
17 dpavlin 184 # based on Tony Risinger post to lxc-users mailing list
18 root 175 # http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html
19 root 190 #
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 root 175
24 dpavlin 181
25 dpavlin 177 which inotifywait >/dev/null || apt-get install inotify-tools
26 root 175
27    
28 dpavlin 181 lxc_exists() {
29     name=$1
30 root 175
31 dpavlin 181 if [ ! -e /var/lib/lxc/$name/config ] ; then
32     echo "Usage: $0 name"
33     lxc_status
34     exit 1
35     fi
36     }
37 root 175
38 dpavlin 179
39 dpavlin 181 lxc_rootfs() {
40 dpavlin 194 grep '^ *lxc\.rootfs *=' "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'
41 dpavlin 181 }
42 dpavlin 178
43 root 175
44 dpavlin 183 lxc_status() {
45 dpavlin 195 find /var/lib/lxc/ -name "config" | cut -d/ -f5 | sort -u | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do
46 dpavlin 189 boot=" "
47     test -s /var/lib/lxc/$name/on_boot && boot="boot"
48     echo "$name $status $boot $(lxc_rootfs $name)"
49 dpavlin 183 done
50     }
51    
52    
53 dpavlin 181 cleanup_init_scripts() {
54     rootfs=$(lxc_rootfs $1)
55 dpavlin 179
56 dpavlin 181 ls \
57     $rootfs/etc/rc?.d/*umountfs \
58     $rootfs/etc/rc?.d/*umountroot \
59     $rootfs/etc/rc?.d/*hwclock* \
60     2>/dev/null | xargs -i rm -v {}
61     }
62 dpavlin 179
63 dpavlin 181
64     setup_inittab() {
65     rootfs=$(lxc_rootfs $1)
66 dpavlin 183 remove=$2
67     add=$3
68 dpavlin 181
69     # let container respond to kill -SIGPWR
70     inittab=$rootfs/etc/inittab
71 dpavlin 183 if ! grep "$add" ${inittab} >/dev/null ; then
72     grep -v "$remove" ${inittab} > ${inittab}.new
73     echo $add >> ${inittab}.new
74 dpavlin 181 mv ${inittab}.new ${inittab}
75 dpavlin 183 echo "$inittab modified with $add"
76 dpavlin 181 fi
77     }
78    
79    
80 dpavlin 189 lxc_log() {
81     echo `date +%Y-%m-%dT%H:%M:%S` $*
82     }
83    
84    
85 dpavlin 183 lxc_kill() {
86 dpavlin 181 name=$1
87 dpavlin 183 sig=$2
88 dpavlin 181
89     init_pid=`lxc-ps -C init -o pid | grep "^$name" | cut -d" " -f2-`
90     if [ -z "$init_pid" ] ; then
91     lxc-info -n $name
92     exit 1
93     fi
94 dpavlin 189 lxc_log "$name kill $sig $init_pid"
95 dpavlin 183 /bin/kill $sig $init_pid
96     }
97    
98     lxc_stop() {
99 dpavlin 189 lxc_log "$name stop"
100 dpavlin 183 lxc_kill $name -SIGPWR
101 dpavlin 179 lxc-wait -n $name -s STOPPED
102 dpavlin 189 lxc_log "$name stoped"
103 dpavlin 183 # rm -f /var/lib/lxc/${name}/on_boot
104 dpavlin 181 }
105 dpavlin 179
106    
107 dpavlin 181 lxc_start() {
108     name=$1
109    
110     if ! lxc-info -n $name | grep RUNNING ; then
111 dpavlin 189 lxc_log "$name start"
112 dpavlin 181 lxc-start -n $name -o /tmp/${name}.log -d
113     lxc-wait -n $name -s RUNNING
114     lxc-info -n $name
115 dpavlin 185 test -f /var/lib/lxc/${name}/on_boot || echo $name > /var/lib/lxc/${name}/on_boot
116 dpavlin 181 fi
117     }
118    
119     lxc_watchdog() {
120     name=$1
121     rootfs=$(lxc_rootfs $1)
122    
123 root 175 while true; do
124     vps_utmp=${rootfs}/var/run/utmp
125 dpavlin 181 tasks=`wc -l < /cgroup/${name}/tasks`
126     test -z "$tasks" && exit 1
127     if [ "$tasks" -eq 1 ]; then
128 root 175
129     runlevel="$(runlevel ${vps_utmp})"
130 dpavlin 187 lxc_log "$name runlevel $runlevel"
131 root 175
132     case $runlevel in
133     N*)
134     # nothing for new boot state
135     ;;
136     ??0)
137 dpavlin 187 lxc_log "$name halt"
138 root 175 lxc-stop -n "${name}"
139 dpavlin 181 lxc-wait -n ${name} -s STOPPED
140 root 175 break
141     ;;
142     ??6)
143 dpavlin 187 lxc_log "$name reboot";
144 root 175 lxc-stop -n ${name}
145     lxc-wait -n ${name} -s STOPPED
146     lxc-start -d -n ${name} -o /tmp/${name}.log
147     ;;
148     *)
149     # make sure vps is still running
150     state="$(lxc-info -n "${name}" | sed -e 's/.* is //')"
151     [ "$state" = "RUNNING" ] || break
152     ;;
153     esac
154 dpavlin 181 else
155 dpavlin 187 lxc_log "$name $tasks tasks"
156 root 175 fi
157 dpavlin 182
158     # time of 5 minutes on it JUST IN CASE...
159     inotifywait -qqt 300 ${vps_utmp}
160 root 175 done
161    
162 dpavlin 189 lxc_log "$name watchdog exited"
163 dpavlin 181
164     }
165    
166    
167 root 190 usage() {
168     echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2
169     exit 3
170     }
171    
172 dpavlin 183 command_on_lxc() {
173     command=$1
174     shift
175 dpavlin 181
176 dpavlin 183 echo "# $command $1"
177    
178     case "$command" in
179    
180 dpavlin 181 start)
181 dpavlin 183 lxc_exists $1
182     cleanup_init_scripts $1
183 dpavlin 193 setup_inittab $1 ":respawn:/sbin/getty.*tty1" "c1:12345:respawn:/sbin/getty 38400 tty1 linux"
184     setup_inittab $1 "::power" "p0::powerfail:/sbin/init 0"
185     setup_inittab $1 "::ctrlaltdel" "p6::ctrlaltdel:/sbin/init 6"
186 dpavlin 183 lxc_start $1
187 dpavlin 186 # give container 5 seconds to start more than one process
188     ( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) &
189 dpavlin 181 ;;
190 dpavlin 183 stop|halt)
191     lxc_exists $1
192     lxc_stop $1
193 dpavlin 181 ;;
194 dpavlin 183 reload|force-reload|restart|reboot)
195     lxc_kill $1 -SIGINT
196 dpavlin 181 ;;
197     watchdog)
198 dpavlin 183 lxc_watchdog $1
199 dpavlin 181 ;;
200 dpavlin 188 boot)
201     echo $1 > /var/lib/lxc/$1/on_boot
202     ;;
203     disable)
204     echo -n > /var/lib/lxc/$1/on_boot
205     ;;
206 dpavlin 181 *)
207 root 190 usage
208 dpavlin 181 ;;
209    
210     esac
211    
212 dpavlin 183 }
213    
214     command=$1
215 root 190 test -z "$command" && usage
216     test "$command" = "status" && lxc_status && exit
217 dpavlin 189 shift
218 dpavlin 183
219     if [ -z "$1" ] ; then
220     ls /var/lib/lxc/*/on_boot | while read path ; do
221     name=`echo $path | cut -d/ -f5`
222 dpavlin 189 if [ "$command" != "start" -o "$command" = "start" -a -s $path ] ; then
223     command_on_lxc $command $name
224     else
225     echo "# skip $command $name"
226     fi
227 dpavlin 183 done
228     else
229     while [ ! -z "$1" ] ; do
230     command_on_lxc $command $1
231     shift
232     done
233     fi
234    

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