ctdb/config/events.d/00.ctdb

   1 #!/bin/sh
   2 ############################
   3 # main event script for ctdb
   4 #
   5 # This script is called with one of the following sets of arguments
   6 #     startup    : called when ctdb starts
   7 #     shutdown   : called when ctdb shuts down
   8 #     takeip     : called when an IP address is taken over
   9 #     releaseip  : called when an IP address is released
  10 #     recovered  : called when ctdb has finished a recovery event
  11
  12 . $CTDB_BASE/functions
  13 loadconfig
  14
  15 case "$1" in
  16      init)
  17         # make sure we have a blank state directory for the scripts to work with
  18         /bin/rm -rf $CTDB_BASE/state
  19         /bin/mkdir -p $CTDB_BASE/state || {
  20             ret=$?
  21             echo "/bin/mkdir -p $CTDB_BASE/state - failed - $ret"
  22             exit $ret
  23         }
  24         ;;
  25
  26      setup)
  27         # set any tunables from the config file
  28         set | grep ^CTDB_SET_ | cut -d_ -f3- |
  29         while read v; do
  30             varname=`echo $v | cut -d= -f1`
  31             value=`echo $v | cut -d= -f2`
  32             ctdb setvar $varname $value || exit 1
  33             echo "Set $varname to $value"
  34         done || exit 1
  35         ;;
  36
  37     monitor)
  38         # We should never enter swap, so SwapTotal == SwapFree.
  39         [ "$CTDB_CHECK_SWAP_IS_NOT_USED" = "yes" ] && {
  40             if [ -n "`grep '^Swap\(Total\|Free\)' /proc/meminfo | uniq -s 10 -u`" ]; then
  41                 echo We are swapping:
  42                 cat /proc/meminfo
  43                 ps auxfww
  44             fi
  45         }
  46
  47         # monitor that we are not running out of memory
  48         [ -z "$CTDB_MONITOR_FREE_MEMORY" ] || {
  49                 FREE_MEM=`free -m | grep "buffers/cache" | while read A B C D ;do /bin/echo -n $D ; done`
  50                 [ `expr "$FREE_MEM" "<" "$CTDB_MONITOR_FREE_MEMORY"` != "0" ] && {
  51                         echo "OOM. Free:$FREE_MEM while CTDB treshold is $CTDB_MONITOR_FREE_MEMORY"
  52                         cat /proc/meminfo
  53                         ps auxfww
  54                         echo m > /proc/sysrq-trigger
  55                         ctdb disable
  56                         sleep 3
  57                         ctdb shutdown
  58                 }
  59         }
  60         ;;
  61
  62     *)
  63         ctdb_standard_event_handler "$@"
  64         ;;
  65 esac
  66
  67 # all OK
  68 exit 0