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 update_config_from_tdb() {
  16         # Pull optional ctdb configuration data out of config.tdb
  17         PUBLICADDRESSESKEY='public-addresses:node#'`ctdb -t 1 xpnn|sed -e "s/.*://"`
  18         rm -f $CTDB_VARDIR/state/public_addresses
  19         ctdb pfetch config.tdb $PUBLICADDRESSESKEY $CTDB_VARDIR/state/public_addresses 2>/dev/null
  20         [ "$?" = "0" ] && [ `stat --format="%s" /etc/ctdb/state/public_addresses` != "0" ] && [ ! -z "$CTDB_PUBLIC_ADDRESSES" ] && {
  21                 diff $CTDB_VARDIR/state/public_addresses $CTDB_PUBLIC_ADDRESSES >/dev/null 2>/dev/null
  22                 [ $? = "0" ] || {
  23                         echo CTDB public address configuration had been updated.
  24                         echo Extracting new configuration from database.
  25                         diff $CTDB_VARDIR/state/public_addresses $CTDB_PUBLIC_ADDRESSES
  26                         cp $CTDB_VARDIR/state/public_addresses $CTDB_PUBLIC_ADDRESSES
  27                         echo Restarting CTDB
  28                         service ctdb restart &
  29                 }
  30         }
  31 }
  32
  33 case "$1" in
  34      init)
  35         # make sure we have a blank state directory for the scripts to work with
  36         /bin/rm -rf $CTDB_VARDIR/state
  37         /bin/mkdir -p $CTDB_VARDIR/state || {
  38             ret=$?
  39             echo "/bin/mkdir -p $CTDB_VARDIR/state - failed - $ret"
  40             exit $ret
  41         }
  42         ;;
  43
  44      setup)
  45         # set any tunables from the config file
  46         set | grep ^CTDB_SET_ | cut -d_ -f3- |
  47         while read v; do
  48             varname=`echo $v | cut -d= -f1`
  49             value=`echo $v | cut -d= -f2`
  50             ctdb setvar $varname $value || exit 1
  51             echo "Set $varname to $value"
  52         done || exit 1
  53         ;;
  54
  55     startup)
  56         update_config_from_tdb &
  57         ;;
  58     monitor)
  59         # We should never enter swap, so SwapTotal == SwapFree.
  60         [ "$CTDB_CHECK_SWAP_IS_NOT_USED" = "yes" ] && {
  61             if [ -n "`grep '^Swap\(Total\|Free\)' /proc/meminfo | uniq -s 10 -u`" ]; then
  62                 echo We are swapping:
  63                 cat /proc/meminfo
  64                 ps auxfww
  65             fi
  66         }
  67
  68         # warn when we get low on memory
  69         [ -z "$CTDB_MONITOR_FREE_MEMORY_WARN" ] || {
  70                 FREE_MEM=`free -m | grep "buffers/cache" | while read A B C D ;do /bin/echo -n $D ; done`
  71                 [ `expr "$FREE_MEM" "<" "$CTDB_MONITOR_FREE_MEMORY_WARN"` != "0" ] && {
  72                         echo "Running low on memory. Free:$FREE_MEM while CTDB treshold is $CTDB_MONITOR_FREE_MEMORY_WARN"
  73                 }
  74         }
  75
  76         # monitor that we are not running out of memory
  77         [ -z "$CTDB_MONITOR_FREE_MEMORY" ] || {
  78                 FREE_MEM=`free -m | grep "buffers/cache" | while read A B C D ;do /bin/echo -n $D ; done`
  79                 [ `expr "$FREE_MEM" "<" "$CTDB_MONITOR_FREE_MEMORY"` != "0" ] && {
  80                         echo "OOM. Free:$FREE_MEM while CTDB treshold is $CTDB_MONITOR_FREE_MEMORY"
  81                         cat /proc/meminfo
  82                         ps auxfww
  83                         echo m > /proc/sysrq-trigger
  84                         ctdb disable
  85                         sleep 3
  86                         ctdb shutdown
  87                 }
  88         }
  89         ;;
  90
  91     *)
  92         ctdb_standard_event_handler "$@"
  93         ;;
  94 esac
  95
  96 # all OK
  97 exit 0