Ansible roles by Evolix
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#!/bin/ksh
################################################################################
# Sample Nagios plugin to monitor free memory on the local machine #
# Author: Daniele Mazzocchio (http://www.kernel-panic.it/) #
################################################################################
VERSION="Version 1.0"
AUTHOR="(c) 2007-2009 Daniele Mazzocchio (danix@kernel-panic.it)"
PROGNAME=`/usr/bin/basename $0`
# Constants
BYTES_IN_MB=$(( 1024 * 1024 ))
KB_IN_MB=1024
# Exit codes
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
# Helper functions #############################################################
function print_revision {
# Print the revision number
echo "$PROGNAME - $VERSION"
}
function print_usage {
# Print a short usage statement
echo "Usage: $PROGNAME [-v] -w <limit> -c <limit>"
}
function print_help {
# Print detailed help information
print_revision
echo "$AUTHOR\n\nCheck free memory on local machine\n"
print_usage
/bin/cat <<__EOT
Options:
-h
Print detailed help screen
-V
Print version information
-w INTEGER
Exit with WARNING status if less than INTEGER MB of memory are free
-w PERCENT%
Exit with WARNING status if less than PERCENT of memory is free
-c INTEGER
Exit with CRITICAL status if less than INTEGER MB of memory are free
-c PERCENT%
Exit with CRITICAL status if less than PERCENT of memory is free
-v
Verbose output
__EOT
}
# Main #########################################################################
# Total memory size (in MB)
tot_mem=$(( `/sbin/sysctl -n hw.physmem` / BYTES_IN_MB))
# Free memory size (in MB)
free_mem=$(/usr/bin/vmstat | /usr/bin/tail -1 | /usr/bin/awk '{ print $4 }' | tr -d 'M')
# Free memory size (in percentage)
free_mem_perc=$(( free_mem * 100 / tot_mem ))
# Verbosity level
verbosity=0
# Warning threshold
thresh_warn=
# Critical threshold
thresh_crit=
# Parse command line options
while [ "$1" ]; do
case "$1" in
-h | --help)
print_help
exit $STATE_OK
;;
-V | --version)
print_revision
exit $STATE_OK
;;
-v | --verbose)
: $(( verbosity++ ))
shift
;;
-w | --warning | -c | --critical)
if [[ -z "$2" || "$2" = -* ]]; then
# Threshold not provided
echo "$PROGNAME: Option '$1' requires an argument"
print_usage
exit $STATE_UNKNOWN
elif [[ "$2" = +([0-9]) ]]; then
# Threshold is a number (MB)
thresh=$2
elif [[ "$2" = +([0-9])% ]]; then
# Threshold is a percentage
thresh=$(( tot_mem * ${2%\%} / 100 ))
else
# Threshold is neither a number nor a percentage
echo "$PROGNAME: Threshold must be integer or percentage"
print_usage
exit $STATE_UNKNOWN
fi
[[ "$1" = *-w* ]] && thresh_warn=$thresh || thresh_crit=$thresh
shift 2
;;
-?)
print_usage
exit $STATE_OK
;;
*)
echo "$PROGNAME: Invalid option '$1'"
print_usage
exit $STATE_UNKNOWN
;;
esac
done
if [[ -z "$thresh_warn" || -z "$thresh_crit" ]]; then
# One or both thresholds were not specified
echo "$PROGNAME: Threshold not set"
print_usage
exit $STATE_UNKNOWN
elif [[ "$thresh_crit" -gt "$thresh_warn" ]]; then
# The warning threshold must be greater than the critical threshold
echo "$PROGNAME: Warning free space should be more than critical free space"
print_usage
exit $STATE_UNKNOWN
fi
if [[ "$verbosity" -ge 2 ]]; then
# Print debugging information
/bin/cat <<__EOT
Debugging information:
Warning threshold: $thresh_warn MB
Critical threshold: $thresh_crit MB
Verbosity level: $verbosity
Total memory: $tot_mem MB
Free memory: $free_mem MB ($free_mem_perc%)
__EOT
fi
if [[ "$free_mem" -lt "$thresh_crit" ]]; then
# Free memory is less than the critical threshold
echo "MEMORY CRITICAL - $free_mem_perc% free ($free_mem MB out of $tot_mem MB)"
exit $STATE_CRITICAL
elif [[ "$free_mem" -lt "$thresh_warn" ]]; then
# Free memory is less than the warning threshold
echo "MEMORY WARNING - $free_mem_perc% free ($free_mem MB out of $tot_mem MB)"
exit $STATE_WARNING
else
# There's enough free memory!
echo "MEMORY OK - $free_mem_perc% free ($free_mem MB out of $tot_mem MB)"
exit $STATE_OK
fi