icinga2-checks/check_iowait.sh

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#!/bin/bash
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# Nagios plugin to check iowait on Linux
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if ! command -v iostat &>/dev/null; then
echo "iostat not found! Please install sysstat:"
echo "sudo apt install sysstat"
exit 1
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fi
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#!/bin/bash
# Nagios plugin to check iowait on Linux
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# Define usage function
function usage {
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echo "Usage: $0 [-w <warning threshold>] [-c <critical threshold>] [-a <average seconds>]"
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echo " -w: Warning threshold for iowait percentage (default: 50)"
echo " -c: Critical threshold for iowait percentage (default: 75)"
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echo " -a: Number of seconds to average iowait (default: 5)"
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exit 3
}
# Parse command line arguments
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while getopts "w:c:a:" opt; do
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case $opt in
w) WARNING_THRESHOLD=$OPTARG ;;
c) CRITICAL_THRESHOLD=$OPTARG ;;
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a) AVERAGE_SECONDS=$OPTARG ;;
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\?)
echo "Invalid option: -$OPTARG" >&2
usage
;;
:)
echo "Option -$OPTARG requires an argument." >&2
usage
;;
esac
done
# Set default warning and critical thresholds if not provided
WARNING_THRESHOLD=${WARNING_THRESHOLD:-50}
CRITICAL_THRESHOLD=${CRITICAL_THRESHOLD:-75}
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AVERAGE_SECONDS=${AVERAGE_SECONDS:-5}
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# Get current iowait percentage and number of processes
IOWAIT=$(iostat -c $AVERAGE_SECONDS 2 | awk '/^ /{print $4}' | tail -n 1)
PROCESSES=$(ps -A --no-headers | wc -l)
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# Check if iowait percentage is above critical threshold
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if (($(echo "$IOWAIT > $CRITICAL_THRESHOLD" | bc -l))); then
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echo "CRITICAL - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100"
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exit 2
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fi
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# Check if iowait percentage is above warning threshold
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if (($(echo "$IOWAIT > $WARNING_THRESHOLD" | bc -l))); then
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echo "WARNING - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100"
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exit 1
fi
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# If iowait percentage is below warning threshold, exit with OK status
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echo "OK - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100"
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exit 0