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#!/bin/sh |
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|
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# lxc-watchdog.sh |
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# |
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# Dobrica Pavlinusic <dpavlin@rot13.org> 2010-03-15 |
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# |
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# this script can be used to start/stop Linux containers |
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# using clever inotify hack to monitor halt/reboot from |
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# Tony Risinger posted to lxc-users mailing list |
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# |
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# http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html |
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|
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|
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which inotifywait >/dev/null || apt-get install inotify-tools |
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|
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|
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lxc_exists() { |
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name=$1 |
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|
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if [ ! -e /var/lib/lxc/$name/config ] ; then |
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echo "Usage: $0 name" |
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lxc_status |
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exit 1 |
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fi |
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} |
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|
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|
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lxc_rootfs() { |
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grep lxc.rootfs "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//' |
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} |
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|
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|
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lxc_status() { |
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lxc-ls -1 | sort -u | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do |
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on_boot=" " |
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test -s /var/lib/lxc/$name/on_boot && on_boot="on_boot" |
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echo "$name $status $on_boot $(lxc_rootfs $name)" |
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done |
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} |
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|
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|
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cleanup_init_scripts() { |
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rootfs=$(lxc_rootfs $1) |
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|
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ls \ |
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$rootfs/etc/rc?.d/*umountfs \ |
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$rootfs/etc/rc?.d/*umountroot \ |
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$rootfs/etc/rc?.d/*hwclock* \ |
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2>/dev/null | xargs -i rm -v {} |
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} |
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|
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|
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setup_inittab() { |
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rootfs=$(lxc_rootfs $1) |
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remove=$2 |
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add=$3 |
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|
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# let container respond to kill -SIGPWR |
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inittab=$rootfs/etc/inittab |
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if ! grep "$add" ${inittab} >/dev/null ; then |
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grep -v "$remove" ${inittab} > ${inittab}.new |
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echo $add >> ${inittab}.new |
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mv ${inittab}.new ${inittab} |
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echo "$inittab modified with $add" |
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fi |
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} |
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|
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|
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lxc_kill() { |
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name=$1 |
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sig=$2 |
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|
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init_pid=`lxc-ps -C init -o pid | grep "^$name" | cut -d" " -f2-` |
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if [ -z "$init_pid" ] ; then |
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lxc-info -n $name |
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exit 1 |
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fi |
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echo "$name kill $sig $init_pid" |
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/bin/kill $sig $init_pid |
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} |
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|
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lxc_stop() { |
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lxc_kill $name -SIGPWR |
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lxc-wait -n $name -s STOPPED |
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# rm -f /var/lib/lxc/${name}/on_boot |
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} |
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|
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|
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lxc_start() { |
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name=$1 |
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|
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if ! lxc-info -n $name | grep RUNNING ; then |
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echo "$name start" |
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lxc-start -n $name -o /tmp/${name}.log -d |
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lxc-wait -n $name -s RUNNING |
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lxc-info -n $name |
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echo $name > /var/lib/lxc/${name}/on_boot |
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fi |
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} |
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|
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lxc_watchdog() { |
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name=$1 |
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rootfs=$(lxc_rootfs $1) |
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|
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while true; do |
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vps_utmp=${rootfs}/var/run/utmp |
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tasks=`wc -l < /cgroup/${name}/tasks` |
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test -z "$tasks" && exit 1 |
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if [ "$tasks" -eq 1 ]; then |
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|
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runlevel="$(runlevel ${vps_utmp})" |
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echo `date +%Y-%m-%dT%H:%M:%S` "$name runlevel $runlevel" |
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|
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case $runlevel in |
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N*) |
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# nothing for new boot state |
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;; |
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??0) |
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echo "$name halt" |
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lxc-stop -n "${name}" |
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lxc-wait -n ${name} -s STOPPED |
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break |
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;; |
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??6) |
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echo "$name reboot"; |
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lxc-stop -n ${name} |
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lxc-wait -n ${name} -s STOPPED |
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lxc-start -d -n ${name} -o /tmp/${name}.log |
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;; |
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*) |
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# make sure vps is still running |
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state="$(lxc-info -n "${name}" | sed -e 's/.* is //')" |
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[ "$state" = "RUNNING" ] || break |
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;; |
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esac |
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else |
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echo "# $name $tasks tasks" |
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fi |
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|
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# time of 5 minutes on it JUST IN CASE... |
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inotifywait -qqt 300 ${vps_utmp} |
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done |
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|
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echo "${name} exited" |
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|
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} |
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|
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|
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command_on_lxc() { |
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command=$1 |
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shift |
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|
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echo "# $command $1" |
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|
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case "$command" in |
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|
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start) |
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lxc_exists $1 |
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cleanup_init_scripts $1 |
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setup_inittab $1 ::power "p0::powerfail:/sbin/init 0" |
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setup_inittab $1 ::ctrlaltdel "p6::ctrlaltdel:/sbin/init 6" |
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lxc_start $1 |
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( nohup $0 watchdog $1 >> /tmp/$1.log 2>/dev/null ) & |
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;; |
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stop|halt) |
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lxc_exists $1 |
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lxc_stop $1 |
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;; |
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reload|force-reload|restart|reboot) |
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lxc_kill $1 -SIGINT |
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;; |
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watchdog) |
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lxc_watchdog $1 |
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;; |
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*) |
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echo "Usage: $0 {start|stop|restart|status}" >&2 |
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exit 3 |
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;; |
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|
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esac |
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|
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} |
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|
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command=$1 |
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shift |
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|
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test "$command" = "status" && lxc_status && exit |
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|
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if [ -z "$1" ] ; then |
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ls /var/lib/lxc/*/on_boot | while read path ; do |
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name=`echo $path | cut -d/ -f5` |
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command_on_lxc $command $name |
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done |
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else |
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while [ ! -z "$1" ] ; do |
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command_on_lxc $command $1 |
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shift |
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done |
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fi |
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