/[sysadmin-cookbook]/recepies/lxc/lxc-watchdog.sh

This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!

Diff of /recepies/lxc/lxc-watchdog.sh

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-revision 188 by dpavlin,
Tue Mar 16 22:00:20 2010 UTC
+revision 227 by dpavlin,
Tue Sep  7 16:02:12 2010 UTC
 Line 16
  #
  # 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
-Line 33 
 lxc_exists() {
+Line 37 
 lxc_exists() {
  lxc_rootfs() {
-         grep lxc.rootfs "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'
+         grep '^ *lxc\.rootfs *=' "/var/lib/lxc/$1/config" | cut -d= -f2 | sed 's/^ *//'
  }
  lxc_status() {
-         lxc-ls -1 | sort -u | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do
+         ( find /var/lib/lxc/ -name "config" | cut -d/ -f5 | sort -u | xargs -i lxc-info -n {} | sed "s/'//g" | while read name is status ; do
-                 on_boot="       "
+                 boot="-"
-                 test -s /var/lib/lxc/$name/on_boot && on_boot="on_boot"
+                 hostname=`cat $(lxc_rootfs $name)/etc/hostname`
-                 echo "$name $status $on_boot $(lxc_rootfs $name)"
+                 ip=`grep address $(lxc_rootfs $name)/etc/network/interfaces | sed 's/.*address //'`
-         done
+                 test -s /var/lib/lxc/$name/on_boot && boot="boot"
+                 echo "$name $status $boot $(lxc_rootfs $name) $ip $hostname"
+         done ) | column -t
  }
-Line 53 
 cleanup_init_scripts() {
+Line 59 
 cleanup_init_scripts() {
                  $rootfs/etc/rc?.d/*umountfs \
                  $rootfs/etc/rc?.d/*umountroot \
                  $rootfs/etc/rc?.d/*hwclock* \
+                 $rootfs/etc/rc?.d/*udev* \
 >/dev/null | xargs -i rm -v {}
+         echo $1 > $rootfs/etc/hostname
  }
-Line 64 
 setup_inittab() {
+Line 73 
 setup_inittab() {
          # let container respond to kill -SIGPWR
          inittab=$rootfs/etc/inittab
-         if ! grep "$add" ${inittab} >/dev/null ; then
+         if test -e $inittab && ! grep "$add" ${inittab} >/dev/null ; then
                  grep -v "$remove" ${inittab} > ${inittab}.new
                  echo $add >> ${inittab}.new
                  mv ${inittab}.new ${inittab}
-Line 73 
 setup_inittab() {
+Line 82 
 setup_inittab() {
  }
+ lxc_log() {
+         echo `date +%Y-%m-%dT%H:%M:%S` $*
+ }
  lxc_kill() {
          name=$1
          sig=$2
-Line 82 
 lxc_kill() {
+Line 96 
 lxc_kill() {
                  lxc-info -n $name
                  exit 1
          fi
-         echo "$name kill $sig $init_pid"
+         lxc_log "$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
-Line 105 
 lxc_start() {
+Line 127 
 lxc_start() {
          fi
  }
- lxc_log() {
-         echo `date +%Y-%m-%dT%H:%M:%S` $*
- }
  lxc_watchdog() {
  name=$1
  rootfs=$(lxc_rootfs $1)
-Line 152 
 while true; do
+Line 170 
 while true; do
          inotifywait -qqt 300 ${vps_utmp}
  done
- lxc_log "$name exited"
+ lxc_log "$name watchdog exited"
  }
+ usage() {
+         echo "Usage: $0 {start|stop|restart|status|boot|disable} [name name ... ]" >&2
+         exit 3
+ }
  command_on_lxc() {
  command=$1
  shift
-Line 168 
 case "$command" in
+Line 191 
 case "$command" in
  start)
          lxc_exists $1
          cleanup_init_scripts $1
-         setup_inittab $1 ::power      "p0::powerfail:/sbin/init 0"
+         setup_inittab $1 ":respawn:/sbin/getty.*tty1"   "c1:12345:respawn:/sbin/getty 38400 tty1 linux"
-         setup_inittab $1 ::ctrlaltdel "p6::ctrlaltdel:/sbin/init 6"
+         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 ) &
-Line 191 
 disable)
+Line 215 
 disable)
          echo -n > /var/lib/lxc/$1/on_boot
          ;;
  *)
-         echo "Usage: $0 {start|stop|restart|status}" >&2
+         usage
-         exit 3
          ;;
  esac
-Line 200 
 esac
+Line 223 
 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`
-                 command_on_lxc $command $name
+                 if [ "$command" != "start" -o "$command" = "start" -a -s $path ] ; then
+                         command_on_lxc $command $name
+                 else
+                         echo "# skip $command $name"
+                 fi
          done
  else
-         shift
          while [ ! -z "$1" ] ; do
                  command_on_lxc $command $1
                  shift

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