nagios: adding check_swaping.sh
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nagios/check_swaping.sh
Executable file
169
nagios/check_swaping.sh
Executable file
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#!/bin/sh
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# Little custom script to :
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# - check if the system has a heavy swap activity
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# - record swapin activity as perfdata
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#
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# For pnp4nagios' sake, create a file usually named 'check_nrpe_swaping.cfg'
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# (depends on your configuration) with the following content :
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# DATATYPE = COUNTER,COUNTER
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# Default values
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THRESHOLD_WARNING="1000"
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THRESHOLD_CRITICAL="2000"
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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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OUTPUT_DETAIL_CRITICAL=""
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OUTPUT_PERFDATA=""
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PROGPATH=$( echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,' )
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REVISION="0.1"
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# Stop at the first non-catched error
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set -e
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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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# (it's only possible because we don't use the range checking function in this script)
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#STATE_OK=0
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#STATE_WARNING=1
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#STATE_CRITICAL=2
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#STATE_UNKNOWN=3
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#STATE_DEPENDENT=4
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#
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# Help function
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#
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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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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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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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Default values:
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warning_threshold : $THRESHOLD_WARNING
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critical_threshold : $THRESHOLD_CRITICAL
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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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#
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# Copy fresh vmstat data into the file passed as an argument
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#
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update_vmstat_previous_data_file() {
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# Harden default files permissions to avoid some data leaks
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umask "0077" || true
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echo "# This file was written by $0 for monitoring swap activity." >"$1"
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echo "# It can be deleted if the need arise, it will be easily recreated without too much lost." >>"$1"
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echo "" >>"$1"
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cat /proc/vmstat >> "$1"
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}
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#
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# Check if arg is an integer
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# (copied from jilles @ http://stackoverflow.com/questions/806906/how-do-i-test-if-a-variable-is-a-number-in-bash )
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#
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is_int() {
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case "$1" in
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''|*[!0-9]*) return 1;;
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*) return 0;;
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esac
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}
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#
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# Parameters management
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#
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while getopts hw:c:f: f; do
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case "$f" in
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'h')
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usage
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exit
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;;
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'w')
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THRESHOLD_WARNING="$OPTARG"
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;;
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'c')
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THRESHOLD_CRITICAL="$OPTARG"
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;;
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'f')
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VMSTAT_PREVIOUS_DATA_FILE="$OPTARG"
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;;
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\?)
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usage
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exit 1
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;;
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esac
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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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echo "UNKNOWN invalid parameter : one of the threshold is not an integer."
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exit $STATE_UNKNOWN
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fi
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# Check if the previous data file exists
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if [ ! -w "$VMSTAT_PREVIOUS_DATA_FILE" ]; then
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update_vmstat_previous_data_file "$VMSTAT_PREVIOUS_DATA_FILE"
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# We wait a little bit to gather some data even on the first run
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# (or we could return an UNKNOWN ?)
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sleep 2
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fi
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# Read previous data
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PREVIOUS_PSWPIN="$( grep '^pswpin' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
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PREVIOUS_PSWPOUT="$( grep '^pswpout' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
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PREVIOUS_PSWPTOTAL=$(( $PREVIOUS_PSWPIN + $PREVIOUS_PSWPOUT ))
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# Get time elapsed since last call
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PREVIOUS_DATA_AGE=$(( $( date +%s ) - $( stat --printf="%Y" "$VMSTAT_PREVIOUS_DATA_FILE" ) ))
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if [ "$PREVIOUS_DATA_AGE" -le "0" ]; then
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echo "UNKNOWN: $PREVIOUS_DATA_AGE second(s) elapsed since last call."
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exit $STATE_UNKNOWN
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fi
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# Update and read current data
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update_vmstat_previous_data_file "$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_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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# 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 [ $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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fi
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echo "OK swaping rate at $PSWP_RATE |$OUTPUT_PERFDATA"
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exit $STATE_OK
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@ -2,6 +2,7 @@
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command[check_disks]=/usr/lib/nagios/plugins/check_disk -f -w 10% -c 5% -W 50% -K 5% -l -X tmpfs -X devpts -X usbfs -X nsfs -X overlay
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command[check_load]=/usr/lib/nagios/plugins/check_load -w 1,1,1 -c 3,2,2
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command[check_network_volume]=/usr/local/share/scripts-admin/nagios/check_network_volume.sh
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command[check_swaping]=/usr/local/share/scripts-admin/nagios/check_swaping.sh
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# Petite commande temporaire pour étudier souci neighbour table overflow
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command[check_network-neighbour-table]=/usr/local/share/scripts-admin/nagios/check_network-neighbour-table.sh
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