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#! /bin/sh |
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### BEGIN INIT INFO |
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# Provides: lxc-watchdog |
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# Required-Start: $remote_fs $named $network $time |
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# Required-Stop: $remote_fs $named $network |
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# Required-Start: |
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# Required-Stop: |
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# Default-Start: 2 3 4 5 |
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# Default-Stop: 0 1 6 |
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# Short-Description: Manage Linux Containers startup/shutdown |
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# Description: Uses clever inotify hack to monitor container's |
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# halt/reboot events watching /var/run/utmp |
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### END INIT INFO |
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|
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# Author: Dobrica Pavlinusic <dpavlin@rot13.org> |
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# |
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# based on Tony Risinger post to lxc-users mailing list |
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# http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html |
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# |
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# Install with: |
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# ln -sf /srv/sysadmin-cookbook/recepies/lxc/lxc-watchdog.sh /etc/init.d/lxc-watchdog |
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# update-rc.d lxc-watchdog defaults |
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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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lxc_hostname() { |
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inside=`cat $(lxc_rootfs $1)/etc/hostname` |
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config=`grep lxc.utsname /var/lib/lxc/$name/config | cut -d= -f2` |
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echo "$config [$inside]"; |
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} |
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|
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lxc_ip() { |
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( grep lxc.network.ipv4 /var/lib/lxc/$name/config | grep -v '^#' | cut -d= -f2 || \ |
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grep address $(lxc_rootfs $name)/etc/network/interfaces | grep -v '^#' | sed 's/.*address //' ) | \ |
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head -1 | \ |
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sed -e 's/ *//g' -e 's/\/.*$//' |
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} |
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|
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lxc_status() { |
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( find /var/lib/lxc/ -name "config" | cut -d/ -f5 | sort -u | while read name ; do |
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status=`lxc-info -n $name 2>/dev/null | grep state: | cut -d: -f2` # 0.7.5 |
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test -z "$status" && status=`lxc-info -n $name | sed -e 's/^.* is //'` # 0.7.2 |
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boot="-" |
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test -s /var/lib/lxc/$name/on_boot && boot="boot" |
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echo "$name $status $boot $(lxc_rootfs $name) $(lxc_ip $name) $(lxc_hostname $name)" |
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done ) | column -t |
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} |
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|
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|
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cleanup_init_scripts() { |
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rootfs=$(lxc_rootfs $1) |
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|
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ls \ |
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$rootfs/etc/rc?.d/*checkroot* \ |
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$rootfs/etc/rc?.d/*umountfs \ |
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$rootfs/etc/rc?.d/*umountroot \ |
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$rootfs/etc/rc?.d/*hwclock* \ |
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$rootfs/etc/rc?.d/*udev* \ |
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$rootfs/etc/rc?.d/*checkfs* \ |
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2>/dev/null | xargs -i rm -v {} |
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|
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echo $1 > $rootfs/etc/hostname |
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grep $1 $rootfs/etc/hosts || echo "$(lxc_ip $1) $1" >> $rootfs/etc/hosts |
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} |
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|
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|
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setup_inittab() { |
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rootfs=$(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 test -e $inittab && ! grep "$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_log() { |
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echo `date +%Y-%m-%dT%H:%M:%S` $* |
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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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ver=`lxc-version | cut -d: -f2 | sed 's/\.//g'` |
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opts='' |
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test $ver -ge 075 && opts='--' |
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|
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init_pid=`lxc-ps $opts -C init -o pid | grep "^$name" | cut -d" " -f2-` |
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if [ -z "$init_pid" ] ; then |
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lxc-info -n $name |
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exit 1 |
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fi |
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lxc_log "$name kill $sig $init_pid" |
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/bin/kill $sig $init_pid |
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} |
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|
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lxc_stop() { |
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lxc_log "$name stop" |
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lxc_kill $name -SIGPWR |
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lxc-wait -n $name -s STOPPED |
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lxc_log "$name stoped" |
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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=$1 |
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rootfs=$(lxc_rootfs $1) |
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|
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if [ ! -e $rootfs ] ; then |
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echo "ERROR $name rootfs $rootfs not found" |
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return |
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fi |
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|
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if ! lxc-info -n $name | grep RUNNING ; then |
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lxc_log "$name start" |
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dev=`df -P $rootfs | tail -1 | cut -d" " -f1` |
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mount $dev -o remount,rw # fix debian upgrade which remounts dir ro |
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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 $name |
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test -f /var/lib/lxc/${name}/on_boot || 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 $1) |
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run=$rootfs/var/run |
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test -L $run && run=$rootfs/`readlink $run` # recent Debian have symlink to /run |
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cd $run || echo "can't cd watchdog into $run" |
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|
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while true; do |
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tasks=`wc -l < /cgroup/${name}/tasks` |
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stop_on=1 # init |
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sulogins=`lxc-ps --name $name | grep sulogin | wc -l` |
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if [ "$sulogins" -gt 0 ] ; then |
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stop_on=`expr $stop_on + $sulogins` |
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fi |
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|
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test -z "$tasks" && exit 1 |
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if [ "$tasks" -eq $stop_on ]; then |
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|
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runlevel="$(runlevel utmp)" |
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lxc_log "$name runlevel $runlevel" |
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|
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case $runlevel in |
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N*) |
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# nothing for new boot state |
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;; |
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??0|unknown) |
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lxc_log "$name halt" |
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lxc-stop -n "${name}" |
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lxc-wait -n ${name} -s STOPPED |
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break |
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;; |
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??6) |
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lxc_log "$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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[ "$state" = "RUNNING" ] || break |
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;; |
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esac |
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else |
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lxc_log "$name $tasks tasks $sulogins console" |
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fi |
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|
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# time of 5 minutes on it JUST IN CASE... |
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inotifywait -qqt 300 utmp |
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done |
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|
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lxc_log "$name watchdog exited" |
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|
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} |
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|
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|
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usage() { |
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echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2 |
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exit 3 |
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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 ":respawn:/sbin/getty.*tty1" "c1:12345:respawn:/sbin/getty 38400 tty1 linux" |
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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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# give container 5 seconds to start more than one process |
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( sleep 5 ; 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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boot) |
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echo $1 > /var/lib/lxc/$1/on_boot |
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;; |
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disable) |
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echo -n > /var/lib/lxc/$1/on_boot |
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;; |
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*) |
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usage |
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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=$1 |
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test -z "$command" && usage |
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test "$command" = "status" && lxc_status && exit |
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shift |
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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 $path | cut -d/ -f5` |
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if [ "$command" != "start" -o "$command" = "start" -a -s $path ] ; then |
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command_on_lxc $command $name |
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else |
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echo "# skip $command $name" |
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fi |
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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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