TMP: add a ctdb snapshot of current ctdb master (git://git.samba.org/ctdb.git) to...

[obnox/samba/samba-obnox.git] / ctdb / config / events.d / 00.ctdb

diff --git a/ctdb/config/events.d/00.ctdb b/ctdb/config/events.d/00.ctdb
new file mode 100755 (executable)
index 0000000..2a48afb
--- /dev/null
+++ b/ctdb/config/events.d/00.ctdb
@@ -0,0 +1,111 @@
+#!/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
+
+. $CTDB_BASE/functions
+loadconfig
+
+ctdb_setup_service_state_dir "ctdb"
+
+#
+update_config_from_tdb() {
+
+    # Pull optional ctdb configuration data out of config.tdb
+    _key="public_addresses:node#$(ctdb -t 1 xpnn|sed -e 's/.*://')"
+    _t="$service_state_dir/public_addresses"
+    rm -f "$_t"
+
+    if ctdb pfetch config.tdb "$_key" "$_t" 2>/dev/null && \
+       [ -s "$_t" -a -n "$CTDB_PUBLIC_ADDRESSES"] && \
+       ! cmp -s "$_t" "$CTDB_PUBLIC_ADDRESSES" ; then
+
+       echo "CTDB public address configuration has changed."
+       echo "Extracting new configuration from database."
+       diff "$_t" "$CTDB_PUBLIC_ADDRESSES"
+       cp "$_t" "$CTDB_PUBLIC_ADDRESSES"
+       echo "Restarting CTDB"
+       service ctdb restart &
+    fi
+}
+
+ctdb_check_args "$@"
+
+case "$1" in 
+     init)
+        # make sure we have a blank state directory for the scripts to work with
+       rm -rf $CTDB_VARDIR/state
+       # Look at the pattern - this should not be -rf!!!
+       rm -f $ctdb_managed_dir/*
+       mkdir -p $CTDB_VARDIR/state || {
+           ret=$?
+           echo "mkdir -p $CTDB_VARDIR/state - failed - $ret"
+           exit $ret
+       }
+       ;;
+
+     setup)
+       # 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
+       ;;
+
+    startup)
+       update_config_from_tdb &
+       ;;
+    monitor)
+       # Inherit the debug level from ctdbd on each monitor run.  If
+       # there's a more urgent need then override CTDB_CURRENT_DEBUGLEVEL
+       # using a file in $CTDB_BASE/rc.local.d/.
+        ctdb_set_current_debuglevel create
+
+       # We should never enter swap, so SwapTotal == SwapFree.
+       [ "$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
+       }
+
+       # warn when we get low on memory
+       [ -z "$CTDB_MONITOR_FREE_MEMORY_WARN" ] || {
+               FREE_MEM=`free -m | grep "buffers/cache" | while read A B C D ;do echo -n $D ; done`
+               [ `expr "$FREE_MEM" "<" "$CTDB_MONITOR_FREE_MEMORY_WARN"` != "0" ] && {
+                       echo "Running low on memory. Free:$FREE_MEM while CTDB treshold is $CTDB_MONITOR_FREE_MEMORY_WARN"
+               }
+       }
+
+       # monitor that we are not running out of memory
+       [ -z "$CTDB_MONITOR_FREE_MEMORY" ] || {
+               FREE_MEM=`free -m | grep "buffers/cache" | while read A B C D ;do 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