-#!/bin/sh
-
-# lxc-watchdog.sh
-#
-# Dobrica Pavlinusic <dpavlin@rot13.org> 2010-03-15
-#
-# this script can be used to start/stop Linux containers
-# using clever inotify hack to monitor halt/reboot from
-# Tony Risinger posted to lxc-users mailing list
+#! /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
+
+# 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 >/dev/null || apt-get install inotify-tools
-lxc_status() {
- lxc-ls -1 | sort -u | xargs -i lxc-info -n {}
-}
lxc_exists() {
name=$1
lxc_rootfs() {
- grep lxc.rootfs "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'
+ grep '^ *lxc\.rootfs *=' "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'
+}
+
+lxc_hostname() {
+ inside=`cat $(lxc_rootfs $1)/etc/hostname`
+ config=`grep lxc.utsname /var/lib/lxc/$name/config | cut -d= -f2`
+ echo "$config [$inside]";
+}
+
+lxc_ip() {
+ ( grep lxc.network.ipv4 /var/lib/lxc/$name/config | grep -v '^#' | cut -d= -f2 || \
+ grep address $(lxc_rootfs $name)/etc/network/interfaces | grep -v '^#' | sed 's/.*address //' ) | \
+ head -1 | \
+ sed -e 's/ *//g' -e 's/\/.*$//'
+}
+
+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="-"
+ test -s /var/lib/lxc/$name/on_boot && boot="boot"
+ echo "$name $status $boot $(lxc_rootfs $name) $(lxc_ip $name) $(lxc_hostname $name)"
+ done ) | column -t
}
rootfs=$(lxc_rootfs $1)
ls \
+ $rootfs/etc/rc?.d/*checkroot* \
$rootfs/etc/rc?.d/*umountfs \
$rootfs/etc/rc?.d/*umountroot \
$rootfs/etc/rc?.d/*hwclock* \
+ $rootfs/etc/rc?.d/*udev* \
+ $rootfs/etc/rc?.d/*checkfs* \
2>/dev/null | xargs -i rm -v {}
+
+ echo $1 > $rootfs/etc/hostname
+ grep $1 $rootfs/etc/hosts || echo "$(lxc_ip $1) $1" >> $rootfs/etc/hosts
}
setup_inittab() {
rootfs=$(lxc_rootfs $1)
+ remove=$2
+ add=$3
# let container respond to kill -SIGPWR
inittab=$rootfs/etc/inittab
- powerfail="pw::powerfail:/sbin/init 0"
- if ! grep "$powerfail" ${inittab} >/dev/null ; then
- grep -v ::power ${inittab} > ${inittab}.new
- echo $powerfail >> ${inittab}.new
+ if test -e $inittab && ! grep "$add" ${inittab} >/dev/null ; then
+ grep -v "$remove" ${inittab} > ${inittab}.new
+ echo $add >> ${inittab}.new
mv ${inittab}.new ${inittab}
- echo "$initab modified"
+ echo "$inittab modified with $add"
fi
+}
+
+lxc_log() {
+ echo `date +%Y-%m-%dT%H:%M:%S` $*
}
-lxc_stop() {
+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 $name
exit 1
fi
- echo "$name stop $init_pid"
- /bin/kill -SIGPWR $init_pid
- lxc-wait -n $name -s STOPPED
+ lxc_log "$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)
+
+ if [ ! -e $rootfs ] ; then
+ echo "ERROR $name rootfs $rootfs not found"
+ return
+ fi
if ! lxc-info -n $name | grep RUNNING ; then
- echo "$name start"
+ 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
}
while true; do
vps_utmp=${rootfs}/var/run/utmp
tasks=`wc -l < /cgroup/${name}/tasks`
+ stop_on=1 # init
+ sulogins=`lxc-ps --name backuppc | grep sulogin | wc -l`
+ if [ "$sulogins" -gt 0 ] ; then
+ stop_on=`expr $stop_on + $sulogins`
+ fi
+
test -z "$tasks" && exit 1
- if [ "$tasks" -eq 1 ]; then
+ if [ "$tasks" -eq $stop_on ]; then
runlevel="$(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
lxc-start -d -n ${name} -o /tmp/${name}.log
;;
esac
else
- echo "# $name $tasks tasks"
+ lxc_log "$name $tasks tasks $sulogins console"
fi
# time of 5 minutes on it JUST IN CASE...
inotifywait -qqt 300 ${vps_utmp}
done
-echo "${name} exited"
+lxc_log "$name watchdog exited"
}
-case "$1" in
+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 $2
- cleanup_init_scripts $2
- setup_inittab $2
- lxc_start $2
- ( nohup $0 watchdog $2 >> /tmp/$2.log ) &
- ;;
-stop)
- lxc_exists $2
- lxc_stop $2
+ 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 ) &
;;
-status)
- lxc_status
+stop|halt)
+ lxc_exists $1
+ lxc_stop $1
;;
-reload|force-reload|restart)
- lxc_stop $2
- lxc_start $2
+reload|force-reload|restart|reboot)
+ lxc_kill $1 -SIGINT
;;
watchdog)
- lxc_watchdog $2
+ lxc_watchdog $1
+ ;;
+boot)
+ echo $1 > /var/lib/lxc/$1/on_boot
+ ;;
+disable)
+ echo -n > /var/lib/lxc/$1/on_boot
;;
*)
- echo "Usage: $0 {start|stop|restart|status}" >&2
- exit 3
+ 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