-#!/bin/bash -x
+#! /bin/sh
+### BEGIN INIT INFO
+# Provides: lxc-watchdog
+# Required-Start: $remote_fs $named $network $time
+# Required-Stop: $remote_fs $named $network
+# Required-Start:
+# Required-Stop:
+# Default-Start: 2 3 4 5
+# Default-Stop: 0 1 6
+# Short-Description: Manage Linux Containers startup/shutdown
+# Description: Uses clever inotify hack to monitor container's
+# halt/reboot events watching /var/run/utmp
+### END INIT INFO
-# based on Tony Risinger code from lxc-users
+# Author: Dobrica Pavlinusic <dpavlin@rot13.org>
+#
+# based on Tony Risinger post to lxc-users mailing list
# http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html
+#
+# Install with:
+# ln -sf /srv/sysadmin-cookbook/recepies/lxc/lxc-watchdog.sh /etc/init.d/lxc-watchdog
+# update-rc.d lxc-watchdog defaults
-which inotifywait || apt-get install inotify-tools
-name=llin
+which inotifywait >/dev/null || apt-get install inotify-tools
-#lxc-info -n $name | grep RUNNING && exit
-rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config | cut -d= -f2`
-echo "$name rootfs $rootfs"
+lxc_exists() {
+ name=$1
-# fix lxc-stop which remounts ro
-mount /mnt/llin -o remount,rw
+ if [ ! -e /var/lib/lxc/$name/config ] ; then
+ echo "Usage: $0 name"
+ lxc_status
+ exit 1
+ fi
+}
+
+
+lxc_rootfs() {
+ grep '^ *lxc\.rootfs *=' "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'
+}
+
+
+lxc_status() {
+ ( 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
+ boot="-"
+ hostname=`cat $(lxc_rootfs $name)/etc/hostname`
+ ip=`grep address $(lxc_rootfs $name)/etc/network/interfaces | sed 's/.*address //'`
+ test -s /var/lib/lxc/$name/on_boot && boot="boot"
+ echo "$name $status $boot $(lxc_rootfs $name) $ip $hostname"
+ done ) | column -t
+}
+
+
+cleanup_init_scripts() {
+ rootfs=$(lxc_rootfs $1)
+
+ ls \
+ $rootfs/etc/rc?.d/*umountfs \
+ $rootfs/etc/rc?.d/*umountroot \
+ $rootfs/etc/rc?.d/*hwclock* \
+ $rootfs/etc/rc?.d/*udev* \
+ 2>/dev/null | xargs -i rm -v {}
+
+ echo $1 > $rootfs/etc/hostname
+}
+
+
+setup_inittab() {
+ rootfs=$(lxc_rootfs $1)
+ remove=$2
+ add=$3
+
+ # let container respond to kill -SIGPWR
+ inittab=$rootfs/etc/inittab
+ if test -e $inittab && ! grep "$add" ${inittab} >/dev/null ; then
+ grep -v "$remove" ${inittab} > ${inittab}.new
+ echo $add >> ${inittab}.new
+ mv ${inittab}.new ${inittab}
+ echo "$inittab modified with $add"
+ fi
+}
+
+
+lxc_log() {
+ echo `date +%Y-%m-%dT%H:%M:%S` $*
+}
+
+
+lxc_kill() {
+ name=$1
+ sig=$2
+
+ init_pid=`lxc-ps -C init -o pid | grep "^$name" | cut -d" " -f2-`
+ if [ -z "$init_pid" ] ; then
+ lxc-info -n $name
+ exit 1
+ fi
+ lxc_log "$name kill $sig $init_pid"
+ /bin/kill $sig $init_pid
+}
+
+lxc_stop() {
+ lxc_log "$name stop"
+ lxc_kill $name -SIGPWR
+ lxc-wait -n $name -s STOPPED
+ lxc_log "$name stoped"
+# rm -f /var/lib/lxc/${name}/on_boot
+}
+
+
+lxc_start() {
+ name=$1
+ rootfs=$(lxc_rootfs $1)
-lxc-start -d -n $name -o /tmp/${name}.log
+ if [ ! -e $rootfs ] ; then
+ echo "ERROR $name rootfs $rootfs not found"
+ return
+ fi
+
+ if ! lxc-info -n $name | grep RUNNING ; then
+ lxc_log "$name start"
+ lxc-start -n $name -o /tmp/${name}.log -d
+ lxc-wait -n $name -s RUNNING
+ lxc-info -n $name
+ test -f /var/lib/lxc/${name}/on_boot || echo $name > /var/lib/lxc/${name}/on_boot
+ fi
+}
+
+lxc_watchdog() {
+name=$1
+rootfs=$(lxc_rootfs $1)
while true; do
- # time of 5 minutes on it JUST IN CASE...
vps_utmp=${rootfs}/var/run/utmp
- inotifywait -qqt 300 ${vps_utmp}
- if [ $(wc -l < /cgroup/${name}/tasks) -eq 1 ]; then
+ tasks=`wc -l < /cgroup/${name}/tasks`
+ test -z "$tasks" && exit 1
+ if [ "$tasks" -eq 1 ]; then
runlevel="$(runlevel ${vps_utmp})"
- echo "# $name runlevel $runlevel"
+ lxc_log "$name runlevel $runlevel"
case $runlevel in
N*)
# nothing for new boot state
;;
??0)
- echo "$name halt"
+ lxc_log "$name halt"
lxc-stop -n "${name}"
+ lxc-wait -n ${name} -s STOPPED
break
;;
??6)
- echo "$name reboot";
+ lxc_log "$name reboot";
lxc-stop -n ${name}
lxc-wait -n ${name} -s STOPPED
- mount /mnt/llin -o remount,rw
lxc-start -d -n ${name} -o /tmp/${name}.log
;;
*)
[ "$state" = "RUNNING" ] || break
;;
esac
+ else
+ lxc_log "$name $tasks tasks"
fi
+
+ # time of 5 minutes on it JUST IN CASE...
+ inotifywait -qqt 300 ${vps_utmp}
done
+lxc_log "$name watchdog exited"
+
+}
+
+
+usage() {
+ echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2
+ exit 3
+}
+
+command_on_lxc() {
+command=$1
+shift
+
+echo "# $command $1"
+
+case "$command" in
+
+start)
+ lxc_exists $1
+ cleanup_init_scripts $1
+ setup_inittab $1 ":respawn:/sbin/getty.*tty1" "c1:12345:respawn:/sbin/getty 38400 tty1 linux"
+ setup_inittab $1 "::power" "p0::powerfail:/sbin/init 0"
+ setup_inittab $1 "::ctrlaltdel" "p6::ctrlaltdel:/sbin/init 6"
+ lxc_start $1
+ # give container 5 seconds to start more than one process
+ ( sleep 5 ; nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) &
+ ;;
+stop|halt)
+ lxc_exists $1
+ lxc_stop $1
+ ;;
+reload|force-reload|restart|reboot)
+ lxc_kill $1 -SIGINT
+ ;;
+watchdog)
+ lxc_watchdog $1
+ ;;
+boot)
+ echo $1 > /var/lib/lxc/$1/on_boot
+ ;;
+disable)
+ echo -n > /var/lib/lxc/$1/on_boot
+ ;;
+*)
+ usage
+ ;;
+
+esac
+
+}
+
+command=$1
+test -z "$command" && usage
+test "$command" = "status" && lxc_status && exit
+shift
+
+if [ -z "$1" ] ; then
+ ls /var/lib/lxc/*/on_boot | while read path ; do
+ name=`echo $path | cut -d/ -f5`
+ if [ "$command" != "start" -o "$command" = "start" -a -s $path ] ; then
+ command_on_lxc $command $name
+ else
+ echo "# skip $command $name"
+ fi
+ done
+else
+ while [ ! -z "$1" ] ; do
+ command_on_lxc $command $1
+ shift
+ done
+fi
+
projects / sysadmin-cookbook / blobdiff