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

   1 #!/bin/bash -x
   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 || apt-get install inotify-tools
   7
   8 name=llin
   9
  10 #lxc-info -n $name | grep RUNNING && exit
  11
  12 rootfs=`grep lxc.rootfs /var/lib/lxc/$name/config | cut -d= -f2`
  13 echo "$name rootfs $rootfs"
  14
  15 # fix lxc-stop which remounts ro
  16 mount /mnt/llin -o remount,rw
  17
  18 lxc-start -d -n $name -o /tmp/${name}.log
  19
  20 while true; do
  21         # time of 5 minutes on it JUST IN CASE...
  22         vps_utmp=${rootfs}/var/run/utmp
  23         inotifywait -qqt 300 ${vps_utmp}
  24         if [ $(wc -l < /cgroup/${name}/tasks) -eq 1 ]; then
  25
  26                 runlevel="$(runlevel ${vps_utmp})"
  27                 echo "# $name runlevel $runlevel"
  28
  29                 case $runlevel in
  30                 N*)
  31                         # nothing for new boot state
  32                 ;;
  33                 ??0)
  34                         echo "$name halt"
  35                         lxc-stop -n "${name}"
  36                         break
  37                 ;;
  38                 ??6)
  39                         echo "$name reboot";
  40                         lxc-stop -n ${name}
  41                         lxc-wait -n ${name} -s STOPPED
  42                         mount /mnt/llin -o remount,rw
  43                         lxc-start -d -n ${name} -o /tmp/${name}.log
  44                 ;;
  45                 *)
  46                         # make sure vps is still running
  47                         state="$(lxc-info -n "${name}" | sed -e 's/.* is //')"
  48                         [ "$state" = "RUNNING" ] || break
  49                 ;;
  50                 esac
  51         fi
  52 done
  53