git.rot13.org Git - sysadmin-cookbook/blob - recepies/lxc/lxc-watchdog.sh

   1 #!/bin/bash
   2
   3 # based on Tony Risinger code from lxc-users
   4 # http://www.mail-archive.com/lxc-users@lists.sourceforge.net/msg00074.html
   5
   6 which inotifywait >/dev/null || apt-get install inotify-tools
   7
   8 name=$1
   9
  10 if [ ! -e /var/lib/lxc/$name/config ] ; then
  11         echo "Usage: $0 name"
  12         ls /var/lib/lxc/*/config | cut -d/ -f5
  13         exit 1
  14 fi
  15
  16 rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config | cut -d= -f2`
  17 echo "$name rootfs $rootfs"
  18
  19
  20 # cleanup init scripts which don't work in containers
  21 ls \
  22         $rootfs/etc/rc?.d/*umountfs \
  23         $rootfs/etc/rc?.d/*umountroot \
  24         $rootfs/etc/rc?.d/*hwclock* \
  25 2>/dev/null | xargs -i rm -v {}
  26
  27
  28 # let container respond to kill -SIGPWR
  29 inittab=$rootfs/etc/inittab
  30 powerfail="pw::powerfail:/sbin/init 0"
  31 if ! grep "$powerfail" ${inittab} >/dev/null ; then
  32         grep -v ::power ${inittab} > ${inittab}.new
  33         echo $powerfail >> ${inittab}.new
  34         mv ${inittab}.new ${inittab}
  35         echo "$initab modified"
  36 fi
  37
  38
  39 if [ "$2" == "stop" ] ; then
  40         echo "$name stop"
  41         kill -SIGPWR `head -1 /cgroup/$name/tasks`
  42         lxc-wait -n $name -s STOPPED
  43         exit
  44 fi
  45
  46
  47 if ! lxc-info -n $name | grep RUNNING ; then
  48         echo "$name start"
  49         lxc-start -n $name -o /tmp/${name}.log -d
  50         lxc-wait  -n $name -s RUNNING
  51         lxc-info  -n $name
  52 fi
  53
  54 while true; do
  55         # time of 5 minutes on it JUST IN CASE...
  56         vps_utmp=${rootfs}/var/run/utmp
  57         inotifywait -qqt 300 ${vps_utmp}
  58         if [ $(wc -l < /cgroup/${name}/tasks) -eq 1 ]; then
  59
  60                 runlevel="$(runlevel ${vps_utmp})"
  61                 echo "# $name runlevel $runlevel"
  62
  63                 case $runlevel in
  64                 N*)
  65                         # nothing for new boot state
  66                 ;;
  67                 ??0)
  68                         echo "$name halt"
  69                         lxc-stop -n "${name}"
  70                         break
  71                 ;;
  72                 ??6)
  73                         echo "$name reboot";
  74                         lxc-stop -n ${name}
  75                         lxc-wait -n ${name} -s STOPPED
  76                         mount /mnt/llin -o remount,rw
  77                         lxc-start -d -n ${name} -o /tmp/${name}.log
  78                 ;;
  79                 *)
  80                         # make sure vps is still running
  81                         state="$(lxc-info -n "${name}" | sed -e 's/.* is //')"
  82                         [ "$state" = "RUNNING" ] || break
  83                 ;;
  84                 esac
  85         fi
  86 done
  87