samba-mirror/ctdb/config/events.d/00.ctdb

#!/bin/sh
############################
# main event script for ctdb
#
# This script is called with one of the following sets of arguments
#     startup    : called when ctdb starts
#     shutdown   : called when ctdb shuts down
#     takeip     : called when an IP address is taken over
#     releaseip  : called when an IP address is released
#     recovered  : called when ctdb has finished a recovery event

. $CTDB_BASE/functions
loadconfig

case "$1" in 
     init)
        # make sure we have a blank state directory for the scripts to work with
	/bin/rm -rf $CTDB_BASE/state
	/bin/mkdir -p $CTDB_BASE/state

	# set any tunables from the config file
	set | grep ^CTDB_SET_ | cut -d_ -f3- | 
	while read v; do
	    varname=`echo $v | cut -d= -f1`
	    value=`echo $v | cut -d= -f2`
	    ctdb setvar $varname $value || exit 1
	    echo "Set $varname to $value"
	done || exit 1
	;;

    monitor)
	# We should never enter swap, so SwapTotal == SwapFree.
	[ "$CTDB_CHECK_SWAP_IS_NOT_USED" = "yes" ] && {
	    if [ -n "`grep '^Swap\(Total\|Free\)' /proc/meminfo | uniq -s 10 -u`" ]; then
		echo We are swapping:
		cat /proc/meminfo
		ps auxfww
	    fi
	}

	# monitor that we are not running out of memory
	[ -z "$CTDB_MONITOR_FREE_MEMORY" ] || {
		FREE_MEM=`free -m | grep "buffers/cache" | while read A B C D ;do /bin/echo -n $D ; done`
		[ `expr "$FREE_MEM" "<" "$CTDB_MONITOR_FREE_MEMORY"` != "0" ] && {
			echo "OOM. Free:$FREE_MEM while CTDB treshold is $CTDB_MONITOR_FREE_MEMORY"
			cat /proc/meminfo
			ps auxfww
			echo m > /proc/sysrq-trigger
			ctdb disable
			sleep 3
			ctdb shutdown
		}
	}
	;;

    *)
	ctdb_standard_event_handler "$@"
	;;
esac

# all OK
exit 0