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Add a setting where CTDB will monitor and warn for low memory conditions.
CTDB_MONITOR_FREE_MEMORY_WARN BZ 59747 (This used to be ctdb commit 83446b2e7e28e3ed6627c1950053018b8799984a)
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@ -112,14 +112,19 @@ CTDB_RECOVERY_LOCK="/some/place/on/shared/storage"
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# defaults to tcp
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# CTDB_TRANSPORT="tcp"
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# When set, this variable makes ctdb monitor the amount of free memory
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# in the system (the second number in the buffers/cache output from free -m).
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# If the amount of free memory drops below this treshold the node will become
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# unhealthy and ctdb and all managed services will be shutdown.
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# These setting allow monitoring for low/out-out of memory conditions.
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#
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# If set, once available memory drops below CTDB_MONITOR_FREE_MEMORY_WARN
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# ctdb will start logging messages that memory is low, but will not
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# take any further action.
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#
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# If the amount of free memory drops below CTDB_MONITOR_FREE_MEMORY
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# ctdb will fail all service over to a different node and finally shutdown.
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# Once this occurs, the administrator needs to find the reason for the OOM
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# situation, rectify it and restart ctdb with "service ctdb start"
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# The unit is MByte
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# CTDB_MONITOR_FREE_MEMORY=100
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# CTDB_MONITOR_FREE_MEMORY_WARN=100
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# CTDB_MONITOR_FREE_MEMORY=10
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# When set to yes, the CTDB node will start in DISABLED mode and not host
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# any public ip addresses. The administrator needs to explicitely enable
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@ -44,6 +44,14 @@ case "$1" in
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fi
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}
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# warn when we get low on memory
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[ -z "$CTDB_MONITOR_FREE_MEMORY_WARN" ] || {
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FREE_MEM=`free -m | grep "buffers/cache" | while read A B C D ;do /bin/echo -n $D ; done`
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[ `expr "$FREE_MEM" "<" "$CTDB_MONITOR_FREE_MEMORY_WARN"` != "0" ] && {
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echo "Running low on memory. Free:$FREE_MEM while CTDB treshold is $CTDB_MONITOR_FREE_MEMORY_WARN"
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}
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}
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# monitor that we are not running out of memory
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[ -z "$CTDB_MONITOR_FREE_MEMORY" ] || {
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FREE_MEM=`free -m | grep "buffers/cache" | while read A B C D ;do /bin/echo -n $D ; done`
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