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|
#!/bin/sh
# ########################################################################
# This program is part of $PROJECT_NAME$
# License: GPL License (see COPYING)
# Authors:
# Baron Schwartz, Roman Vynar
# ########################################################################
# ########################################################################
# Redirect STDERR to STDOUT; Nagios doesn't handle STDERR.
# ########################################################################
exec 2>&1
# ########################################################################
# Set up constants, etc.
# ########################################################################
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
STATE_DEPENDENT=4
# ########################################################################
# Run the program.
# ########################################################################
main() {
# Get options
for o; do
case "${o}" in
-w) shift; OPT_WARN="${1}"; shift; ;;
-d) shift; ;; # left for backward-compatibility
-c) shift; OPT_CRIT="${1}"; shift; ;;
--version) grep -A2 '^=head1 VERSION' "$0" | tail -n1; exit 0 ;;
--help) perl -00 -ne 'm/^ Usage:/ && print' "$0"; exit 0 ;;
-*) echo "Unknown option ${o}. Try --help."; exit 1; ;;
esac
done
OPT_WARN=${OPT_WARN:-90}
OPT_CRIT=${OPT_CRIT:-95}
if is_not_sourced; then
if [ -n "$1" ]; then
echo "WARN spurious command-line options: $@"
exit 1
fi
fi
NOTE="UNK cannot find memory statistics"
TEMP=$(mktemp -t "${0##*/}.XXXXXX") || exit $?
trap "rm -f '${TEMP}' >/dev/null 2>&1" EXIT
if [ -e /proc/meminfo ] && cat /proc/meminfo > "${TEMP}" ; then
USD_PCT=$(get_used_memory_linux "${TEMP}")
elif which sysctl > /dev/null && sysctl -a > "${TEMP}" ; then
USD_PCT=$(get_used_memory_bsd "${TEMP}")
else
echo $NOTE
exit
fi
NOTE="Memory ${USD_PCT}% used"
if [ "${USD_PCT:-0}" -ge "${OPT_CRIT}" ]; then
NOTE="CRIT $NOTE. $(get_largest_process)"
elif [ "${USD_PCT:-0}" -ge "${OPT_WARN}" ]; then
NOTE="WARN $NOTE. $(get_largest_process)"
else
NOTE="OK $NOTE"
fi
# Build the common perf data output for graph trending
PERFDATA="memory_used=${USD_PCT:-0};${OPT_WARN};${OPT_CRIT};0;100"
echo "$NOTE | $PERFDATA"
}
# ########################################################################
# Find the largest process
# ########################################################################
get_largest_process () {
ALL_PROCS=$(ps axo pid,%mem,ucomm | sort -k2 -nr)
BIGGEST=$(echo $ALL_PROCS | head -n 1)
BIG_PID=$(echo $BIGGEST | cut -d' ' -f1)
BIG_MEM=$(echo $BIGGEST | cut -d' ' -f2)
BIG_COMMAND=$(echo $BIGGEST | cut -d' ' -f3)
echo "Largest process: ${BIG_COMMAND} (${BIG_PID}) = ${BIG_MEM}%"
}
# ########################################################################
# Get the used memory from /proc/meminfo
# Consider MemAvailable if available in the file (starting procps-ng 3.3.10).
# See https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773
# ########################################################################
get_used_memory_linux() {
awk '/^MemTotal:/ {total = $2;}
/^MemFree:/ {free = $2;}
/^MemAvailable:/ {avail = $2;}
/^Buffers:/ {buffers = $2;}
/^Cached:/ {cached = $2;
if (avail == "") avail = free + buffers + cached;
printf "%d\n", (total - avail) / total * 100;}' "$1"
}
# ########################################################################
# Get the used memory from sysctl for BSD systems
# ########################################################################
get_used_memory_bsd() {
awk '/vm.stats.vm.v_cache_count:/ {cache = $2}
/vm.stats.vm.v_inactive_count:/ {inactive = $2}
/vm.stats.vm.v_free_count:/ {free = $2}
/vm.stats.vm.v_page_count:/ {
total = $2;
used = total - inactive - cache - free;
printf "%d\n", used / total * 100}' "$1"
}
# ########################################################################
# Determine whether this program is being executed directly, or sourced/included
# from another file.
# ########################################################################
is_not_sourced() {
[ "${0##*/}" = "pmp-check-unix-memory" ] || [ "${0##*/}" = "bash" -a "$_" = "$0" ]
}
# ########################################################################
# Execute the program if it was not included from another file.
# This makes it possible to include without executing, and thus test.
# ########################################################################
if is_not_sourced; then
OUTPUT=$(main "$@")
EXITSTATUS=$STATE_UNKNOWN
case "${OUTPUT}" in
UNK*) EXITSTATUS=$STATE_UNKNOWN; ;;
OK*) EXITSTATUS=$STATE_OK; ;;
WARN*) EXITSTATUS=$STATE_WARNING; ;;
CRIT*) EXITSTATUS=$STATE_CRITICAL; ;;
esac
echo "${OUTPUT}"
exit $EXITSTATUS
fi
# ############################################################################
# Documentation
# ############################################################################
: <<'DOCUMENTATION'
=pod
=head1 NAME
pmp-check-unix-memory - Alert on low memory.
=head1 SYNOPSIS
Usage: pmp-check-unix-memory [OPTIONS]
Options:
-c CRIT Critical threshold; default 95%.
-w WARN Warning threshold; default 90%.
--help Print help and exit.
--version Print version and exit.
Options must be given as --option value, not --option=value or -Ovalue.
Use perldoc to read embedded documentation with more details.
=head1 DESCRIPTION
This Nagios plugin examines C</proc/meminfo> (Linux) or the output of C<sysctl> (BSD)
to check whether the system is running out of memory and finds the largest
process in memory from C<ps> output.
The plugin is tested on GNU/Linux and FreeBSD.
=head1 PRIVILEGES
This plugin does not access MySQL.
This plugin executes the following UNIX commands that may need special privileges:
=over
=item *
cat /proc/meminfo (Linux), sysctl (BSD)
=item *
ps
=back
=head1 COPYRIGHT, LICENSE, AND WARRANTY
This program is copyright 2012-$CURRENT_YEAR$ Baron Schwartz, 2012-$CURRENT_YEAR$ Percona Inc.
Feedback and improvements are welcome.
THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, version 2. You should have received a copy of the GNU General
Public License along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
=head1 VERSION
$PROJECT_NAME$ pmp-check-unix-memory $VERSION$
=cut
DOCUMENTATION
|
