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event scripts: add logging for low memory conditions

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We should never enter swap; if we do, show the memory state of the machine and the process list.  This will help us diagnose what caused the condition before it's too late and the box starts OOM-killing processes.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

(This used to be ctdb commit 627a6d67a0e9e61f8713e62695b3518c51909230)
This commit is contained in:
Rusty Russell 2010-02-09 12:46:35 +10:30
parent 2406733ed2
commit 34b8b98078
1 changed files with 10 additions and 0 deletions
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10
ctdb/config/events.d/00.ctdb
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@ -29,11 +29,21 @@ case "$1" in
;;
monitor)
# We should never enter swap, so SwapTotal == SwapFree.
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