/[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

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

Parent Directory Parent Directory | Revision Log Revision Log


Revision 187 - (hide annotations)
Tue Mar 16 21:36:45 2010 UTC (14 years ago) by dpavlin
File MIME type: application/x-sh
File size: 4152 byte(s)
timestap watchdog output

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

Properties

Name Value
svn:executable *

  ViewVC Help
Powered by ViewVC 1.1.26