nagios/check_swaping: adding check on oom_kill + change of unit
In order to standardize units, we use bytes instead of page/pagesize.
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@ -11,11 +11,13 @@
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# Default values
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THRESHOLD_WARNING="50"
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THRESHOLD_CRITICAL="200"
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PAGESIZE=4096
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THRESHOLD_WARNING="200000"
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THRESHOLD_CRITICAL="1000000"
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THRESHOLD_OOMKILL="0"
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DISABLE_OOMKILL=""
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VMSTAT_PREVIOUS_DATA_FILE="/tmp/.monitoring_vmstat.txt"
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# Output
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OUTPUT_EXIT_STATUS=0
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OUTPUT_DETAIL_WARNING=""
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@ -28,6 +30,9 @@ REVISION="0.1"
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# Stop at the first non-catched error
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set -e
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# Set/guess current page size
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which getconf >/dev/null 2>&1 && PAGESIZE="$( getconf PAGESIZE )"
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# Include check_range()
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. $PROGPATH/utils.sh
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# If you don't have the previous file, just comment the line and uncomment the following
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@ -45,17 +50,18 @@ set -e
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usage() {
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cat <<EOF
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Usage :
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$0 [-w warning_threshold] [-c critical_threshold] [-f vmstat_previous_data_file ]
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$0 [-w warning_threshold] [-c critical_threshold] [-f vmstat_previous_data_file ] [ -k oom_kill_threshold ] [ -K ]
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Note 1 : the script will measure the number of seconds passed since its last call and will
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divide the measures accordingly, so write the thresholds using pages/s in mind.
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divide the measures accordingly, so write the thresholds using bytes/second in mind.
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The script will measure against pswpin and pswpout added together.
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Note 2 : the thresholds use the kernel page size as unit. Use 'getconf PAGESIZE' to get it if needed.
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Note 2 : if 'oom_kill' is not available in /proc/vmstat, you can disable the check with '-K'.
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Default values:
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warning_threshold : $THRESHOLD_WARNING
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critical_threshold : $THRESHOLD_CRITICAL
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oom_kill_threshold : $THRESHOLD_OOMKILL
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vmstat_previous_data_file : $VMSTAT_PREVIOUS_DATA_FILE
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EOF
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}
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@ -89,7 +95,7 @@ is_int() {
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#
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# Parameters management
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#
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while getopts hw:c:f: f; do
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while getopts hw:c:f:k:K f; do
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case "$f" in
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'h')
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usage
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@ -108,6 +114,14 @@ while getopts hw:c:f: f; do
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VMSTAT_PREVIOUS_DATA_FILE="$OPTARG"
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;;
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'k')
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THRESHOLD_OOMKILL="$OPTARG"
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;;
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'K')
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DISABLE_OOMKILL="1"
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;;
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\?)
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usage
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exit 1
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@ -117,10 +131,14 @@ done
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shift $( expr $OPTIND - 1 )
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# Little checks
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if ! is_int "$THRESHOLD_WARNING" || ! is_int "$THRESHOLD_CRITICAL"; then
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if ! is_int "$THRESHOLD_WARNING" || ! is_int "$THRESHOLD_CRITICAL" || ! is_int "$THRESHOLD_OOMKILL" ; then
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echo "UNKNOWN invalid parameter : one of the threshold is not an integer."
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exit $STATE_UNKNOWN
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fi
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if [ -z "$DISABLE_OOMKILL" ] && ! grep '^oom_kill ' /proc/vmstat >/dev/null 2>&1; then
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echo "UNKNOWN threshold set for oom_kill but the counter not available in /proc/vmstat."
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exit $STATE_UNKNOWN
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fi
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# Check if the previous data file exists
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if [ ! -w "$VMSTAT_PREVIOUS_DATA_FILE" ]; then
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@ -132,8 +150,8 @@ if [ ! -w "$VMSTAT_PREVIOUS_DATA_FILE" ]; then
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fi
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# Read previous data
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PREVIOUS_PSWPIN="$( grep '^pswpin' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
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PREVIOUS_PSWPOUT="$( grep '^pswpout' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
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PREVIOUS_PSWPIN="$(( $( grep '^pswpin' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 ) * $PAGESIZE ))"
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PREVIOUS_PSWPOUT="$(( $( grep '^pswpout' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 ) * $PAGESIZE ))"
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PREVIOUS_PSWPTOTAL=$(( $PREVIOUS_PSWPIN + $PREVIOUS_PSWPOUT ))
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# Get time elapsed since last call
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@ -145,21 +163,28 @@ fi
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# Update and read current data
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update_vmstat_previous_data_file "$VMSTAT_PREVIOUS_DATA_FILE"
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CURRENT_PSWPIN="$( grep '^pswpin' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
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CURRENT_PSWPOUT="$( grep '^pswpout' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
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CURRENT_OOMKILL="$( grep '^oom_kill' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
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CURRENT_PSWPIN="$(( $( grep '^pswpin' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 ) * $PAGESIZE ))"
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CURRENT_PSWPOUT="$(( $( grep '^pswpout' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 ) * $PAGESIZE ))"
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CURRENT_PSWPTOTAL=$(( $CURRENT_PSWPIN + $CURRENT_PSWPOUT ))
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# Calculate the swaping rate
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PSWP_RATE=$(( ( $CURRENT_PSWPTOTAL - $PREVIOUS_PSWPTOTAL ) / $PREVIOUS_DATA_AGE ))
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# Generate perfdata
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OUTPUT_PERFDATA="$( printf " pswpin=%d pswpout=%d" "$CURRENT_PSWPIN" "$CURRENT_PSWPOUT" )"
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if [ -n "$CURRENT_OOMKILL" ]; then
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OUTPUT_PERFDATA="$( printf " oomkill=%d" "$CURRENT_OOMKILL" )"
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fi
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OUTPUT_PERFDATA="$( printf "$OUTPUT_PERFDATA pswpin=%d pswpout=%d" "$CURRENT_PSWPIN" "$CURRENT_PSWPOUT" )"
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# Comparison
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# note: remember that numbers can be reseted to zero from time to time (64bits counter ?)
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if [ $PSWP_RATE -gt $THRESHOLD_CRITICAL ]; then
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echo "CRITICAL swaping rate at $PSWP_RATE (limit at $THRESHOLD_CRITICAL) |$OUTPUT_PERFDATA"
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exit $STATE_CRITICAL
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elif [ -z "$DISABLE_OOMKILL" ] && [ $CURRENT_OOMKILL -gt $THRESHOLD_OOMKILL ]; then
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echo "CRITICAL $CURRENT_OOMKILL OOM kill(s) (limit at $THRESHOLD_OOMKILL) |$OUTPUT_PERFDATA"
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exit $STATE_CRITICAL
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elif [ $PSWP_RATE -gt $THRESHOLD_WARNING ]; then
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echo "WARNING swaping rate at $PSWP_RATE (limit at $THRESHOLD_WARNING) |$OUTPUT_PERFDATA"
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exit $STATE_WARNING
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