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check_iowait.sh avg over interval

This commit is contained in:
Cyberes 2023-04-21 23:54:18 -06:00
parent 7c73fbd4c2
commit 50e85bcd2c
1 changed files with 18 additions and 6 deletions
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24
check_iowait.sh
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@ -7,19 +7,25 @@ if ! command -v iostat &>/dev/null; then
exit 1 exit 1
fi fi
#!/bin/bash
# Nagios plugin to check iowait on Linux
# Define usage function # Define usage function
function usage { function usage {
echo "Usage: $0 [-w <warning threshold>] [-c <critical threshold>]" echo "Usage: $0 [-w <warning threshold>] [-c <critical threshold>] [-a <average seconds>]"
echo " -w: Warning threshold for iowait percentage (default: 50)" echo " -w: Warning threshold for iowait percentage (default: 50)"
echo " -c: Critical threshold for iowait percentage (default: 75)" echo " -c: Critical threshold for iowait percentage (default: 75)"
echo " -a: Number of seconds to average iowait (default: 5)"
exit 3 exit 3
} }
# Parse command line arguments # Parse command line arguments
while getopts "w:c:" opt; do while getopts "w:c:a:" opt; do
case $opt in case $opt in
w) WARNING_THRESHOLD=$OPTARG ;; w) WARNING_THRESHOLD=$OPTARG ;;
c) CRITICAL_THRESHOLD=$OPTARG ;; c) CRITICAL_THRESHOLD=$OPTARG ;;
a) AVERAGE_SECONDS=$OPTARG ;;
\?) \?)
echo "Invalid option: -$OPTARG" >&2 echo "Invalid option: -$OPTARG" >&2
usage usage
@ -34,18 +40,24 @@ done
# Set default warning and critical thresholds if not provided # Set default warning and critical thresholds if not provided
WARNING_THRESHOLD=${WARNING_THRESHOLD:-50} WARNING_THRESHOLD=${WARNING_THRESHOLD:-50}
CRITICAL_THRESHOLD=${CRITICAL_THRESHOLD:-75} CRITICAL_THRESHOLD=${CRITICAL_THRESHOLD:-75}
AVERAGE_SECONDS=${AVERAGE_SECONDS:-5}
IOWAIT=$(iostat -c | awk '/^ /{print $4}') # Get current iowait percentage and number of processes
IOWAIT=$(iostat -c $AVERAGE_SECONDS 2 | awk '/^ /{print $4}' | tail -n 1)
PROCESSES=$(ps -A --no-headers | wc -l)
# Check if iowait percentage is above critical threshold
if (($(echo "$IOWAIT > $CRITICAL_THRESHOLD" | bc -l))); then if (($(echo "$IOWAIT > $CRITICAL_THRESHOLD" | bc -l))); then
echo "CRITICAL - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100" echo "CRITICAL - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100 processes=$PROCESSES"
exit 2 exit 2
fi fi
# Check if iowait percentage is above warning threshold
if (($(echo "$IOWAIT > $WARNING_THRESHOLD" | bc -l))); then if (($(echo "$IOWAIT > $WARNING_THRESHOLD" | bc -l))); then
echo "WARNING - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100" echo "WARNING - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100 processes=$PROCESSES"
exit 1 exit 1
fi fi
echo "OK - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100" # If iowait percentage is below warning threshold, exit with OK status
echo "OK - iowait percentage is $IOWAIT% | iowait=$IOWAIT%;$WARNING_THRESHOLD;$CRITICAL_THRESHOLD;0;100 processes=$PROCESSES"
exit 0 exit 0