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nagios: adding check_swaping.sh

This commit is contained in:
Chl 2021-08-23 01:18:31 +02:00
parent 2e7e98e812
commit fc4d38b8cd
2 changed files with 170 additions and 0 deletions

169
nagios/check_swaping.sh Executable file
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@ -0,0 +1,169 @@
#!/bin/sh
# Little custom script to :
# - check if the system has a heavy swap activity
# - record swapin activity as perfdata
#
# For pnp4nagios' sake, create a file usually named 'check_nrpe_swaping.cfg'
# (depends on your configuration) with the following content :
# DATATYPE = COUNTER,COUNTER
# Default values
THRESHOLD_WARNING="1000"
THRESHOLD_CRITICAL="2000"
VMSTAT_PREVIOUS_DATA_FILE="/tmp/.monitoring_vmstat.txt"
# Output
OUTPUT_EXIT_STATUS=0
OUTPUT_DETAIL_WARNING=""
OUTPUT_DETAIL_CRITICAL=""
OUTPUT_PERFDATA=""
PROGPATH=$( echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,' )
REVISION="0.1"
# Stop at the first non-catched error
set -e
# Include check_range()
. $PROGPATH/utils.sh
# If you don't have the previous file, just comment the line and uncomment the following
# (it's only possible because we don't use the range checking function in this script)
#STATE_OK=0
#STATE_WARNING=1
#STATE_CRITICAL=2
#STATE_UNKNOWN=3
#STATE_DEPENDENT=4
#
# Help function
#
usage() {
cat <<EOF
Usage :
$0 [-w warning_threshold] [-c critical_threshold] [-f vmstat_previous_data_file ]
Note 1 : the script will measure the number of seconds passed since its last call and will
divide the measures accordingly, so write the thresholds using pages/s in mind.
The script will measure against pswpin and pswpout added together.
Note 2 : the thresholds use the kernel page size as unit. Use 'getconf PAGESIZE' to get it if needed.
Default values:
warning_threshold : $THRESHOLD_WARNING
critical_threshold : $THRESHOLD_CRITICAL
vmstat_previous_data_file : $VMSTAT_PREVIOUS_DATA_FILE
EOF
}
#
# Copy fresh vmstat data into the file passed as an argument
#
update_vmstat_previous_data_file() {
# Harden default files permissions to avoid some data leaks
umask "0077" || true
echo "# This file was written by $0 for monitoring swap activity." >"$1"
echo "# It can be deleted if the need arise, it will be easily recreated without too much lost." >>"$1"
echo "" >>"$1"
cat /proc/vmstat >> "$1"
}
#
# Check if arg is an integer
# (copied from jilles @ http://stackoverflow.com/questions/806906/how-do-i-test-if-a-variable-is-a-number-in-bash )
#
is_int() {
case "$1" in
''|*[!0-9]*) return 1;;
*) return 0;;
esac
}
#
# Parameters management
#
while getopts hw:c:f: f; do
case "$f" in
'h')
usage
exit
;;
'w')
THRESHOLD_WARNING="$OPTARG"
;;
'c')
THRESHOLD_CRITICAL="$OPTARG"
;;
'f')
VMSTAT_PREVIOUS_DATA_FILE="$OPTARG"
;;
\?)
usage
exit 1
;;
esac
done
shift $( expr $OPTIND - 1 )
# Little checks
if ! is_int "$THRESHOLD_WARNING" || ! is_int "$THRESHOLD_CRITICAL"; then
echo "UNKNOWN invalid parameter : one of the threshold is not an integer."
exit $STATE_UNKNOWN
fi
# Check if the previous data file exists
if [ ! -w "$VMSTAT_PREVIOUS_DATA_FILE" ]; then
update_vmstat_previous_data_file "$VMSTAT_PREVIOUS_DATA_FILE"
# We wait a little bit to gather some data even on the first run
# (or we could return an UNKNOWN ?)
sleep 2
fi
# Read previous data
PREVIOUS_PSWPIN="$( grep '^pswpin' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
PREVIOUS_PSWPOUT="$( grep '^pswpout' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
PREVIOUS_PSWPTOTAL=$(( $PREVIOUS_PSWPIN + $PREVIOUS_PSWPOUT ))
# Get time elapsed since last call
PREVIOUS_DATA_AGE=$(( $( date +%s ) - $( stat --printf="%Y" "$VMSTAT_PREVIOUS_DATA_FILE" ) ))
if [ "$PREVIOUS_DATA_AGE" -le "0" ]; then
echo "UNKNOWN: $PREVIOUS_DATA_AGE second(s) elapsed since last call."
exit $STATE_UNKNOWN
fi
# Update and read current data
update_vmstat_previous_data_file "$VMSTAT_PREVIOUS_DATA_FILE"
CURRENT_PSWPIN="$( grep '^pswpin' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
CURRENT_PSWPOUT="$( grep '^pswpout' "$VMSTAT_PREVIOUS_DATA_FILE" | cut -d " " -f 2 )"
CURRENT_PSWPTOTAL=$(( $CURRENT_PSWPIN + $CURRENT_PSWPOUT ))
# Calculate the swaping rate
PSWP_RATE=$(( ( $CURRENT_PSWPTOTAL - $PREVIOUS_PSWPTOTAL ) / $PREVIOUS_DATA_AGE ))
# Generate perfdata
OUTPUT_PERFDATA="$( printf " pswpin=%d pswpout=%d" "$CURRENT_PSWPIN" "$CURRENT_PSWPOUT" )"
# Comparison
# note: remember that numbers can be reseted to zero from time to time (64bits counter ?)
if [ $PSWP_RATE -gt $THRESHOLD_CRITICAL ]; then
echo "CRITICAL swaping rate at $PSWP_RATE (limit at $THRESHOLD_CRITICAL) |$OUTPUT_PERFDATA"
exit $STATE_CRITICAL
elif [ $PSWP_RATE -gt $THRESHOLD_WARNING ]; then
echo "WARNING swaping rate at $PSWP_RATE (limit at $THRESHOLD_WARNING) |$OUTPUT_PERFDATA"
exit $STATE_WARNING
fi
echo "OK swaping rate at $PSWP_RATE |$OUTPUT_PERFDATA"
exit $STATE_OK

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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 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
command[check_load]=/usr/lib/nagios/plugins/check_load -w 1,1,1 -c 3,2,2 command[check_load]=/usr/lib/nagios/plugins/check_load -w 1,1,1 -c 3,2,2
command[check_network_volume]=/usr/local/share/scripts-admin/nagios/check_network_volume.sh command[check_network_volume]=/usr/local/share/scripts-admin/nagios/check_network_volume.sh
command[check_swaping]=/usr/local/share/scripts-admin/nagios/check_swaping.sh
# Petite commande temporaire pour étudier souci neighbour table overflow # Petite commande temporaire pour étudier souci neighbour table overflow
command[check_network-neighbour-table]=/usr/local/share/scripts-admin/nagios/check_network-neighbour-table.sh command[check_network-neighbour-table]=/usr/local/share/scripts-admin/nagios/check_network-neighbour-table.sh