diff options
Diffstat (limited to 'usr-lib-nagios-plugins')
| -rwxr-xr-x | usr-lib-nagios-plugins/check_mem.pl | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/usr-lib-nagios-plugins/check_mem.pl b/usr-lib-nagios-plugins/check_mem.pl new file mode 100755 index 0000000..5f70757 --- /dev/null +++ b/usr-lib-nagios-plugins/check_mem.pl @@ -0,0 +1,363 @@ +#!/usr/bin/perl -w + +# Heavily based on the script from: +# check_mem.pl Copyright (C) 2000 Dan Larsson <dl@tyfon.net> +# heavily modified by +# Justin Ellison <justin@techadvise.com> +# +# The MIT License (MIT) +# Copyright (c) 2011 justin@techadvise.com + +# Permission is hereby granted, free of charge, to any person obtaining a copy of this +# software and associated documentation files (the "Software"), to deal in the Software +# without restriction, including without limitation the rights to use, copy, modify, +# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to +# permit persons to whom the Software is furnished to do so, subject to the following conditions: + +# The above copyright notice and this permission notice shall be included in all copies +# or substantial portions of the Software. + +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, +# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR +# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE +# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT +# OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +# OTHER DEALINGS IN THE SOFTWARE. + +# Tell Perl what we need to use +use strict; +use Getopt::Std; + +#TODO - Convert to Nagios::Plugin +#TODO - Use an alarm + +# Predefined exit codes for Nagios +use vars qw($opt_c $opt_f $opt_u $opt_w $opt_C $opt_v %exit_codes); +%exit_codes = ('UNKNOWN' , 3, + 'OK' , 0, + 'WARNING' , 1, + 'CRITICAL', 2, + ); + +# Get our variables, do our checking: +init(); + +# Get the numbers: +my ($free_memory_kb,$used_memory_kb,$caches_kb) = get_memory_info(); +print "$free_memory_kb Free\n$used_memory_kb Used\n$caches_kb Cache\n" if ($opt_v); + +if ($opt_C) { #Do we count caches as free? + $used_memory_kb -= $caches_kb; + $free_memory_kb += $caches_kb; +} + +# Round to the nearest KB +$free_memory_kb = sprintf('%d',$free_memory_kb); +$used_memory_kb = sprintf('%d',$used_memory_kb); +$caches_kb = sprintf('%d',$caches_kb); + +# Tell Nagios what we came up with +tell_nagios($used_memory_kb,$free_memory_kb,$caches_kb); + + +sub tell_nagios { + my ($used,$free,$caches) = @_; + + # Calculate Total Memory + my $total = $free + $used; + print "$total Total\n" if ($opt_v); + + my $perf_warn; + my $perf_crit; + if ( $opt_u ) { + $perf_warn = int(${total} * $opt_w / 100); + $perf_crit = int(${total} * $opt_c / 100); + } else { + $perf_warn = int(${total} * ( 100 - $opt_w ) / 100); + $perf_crit = int(${total} * ( 100 - $opt_c ) / 100); + } + + my $perfdata = "|TOTAL=${total}KB;;;; USED=${used}KB;${perf_warn};${perf_crit};; FREE=${free}KB;;;; CACHES=${caches}KB;;;;"; + + if ($opt_f) { + my $percent = sprintf "%.1f", ($free / $total * 100); + if ($percent <= $opt_c) { + finish("CRITICAL - $percent% ($free kB) free!$perfdata",$exit_codes{'CRITICAL'}); + } + elsif ($percent <= $opt_w) { + finish("WARNING - $percent% ($free kB) free!$perfdata",$exit_codes{'WARNING'}); + } + else { + finish("OK - $percent% ($free kB) free.$perfdata",$exit_codes{'OK'}); + } + } + elsif ($opt_u) { + my $percent = sprintf "%.1f", ($used / $total * 100); + if ($percent >= $opt_c) { + finish("CRITICAL - $percent% ($used kB) used!$perfdata",$exit_codes{'CRITICAL'}); + } + elsif ($percent >= $opt_w) { + finish("WARNING - $percent% ($used kB) used!$perfdata",$exit_codes{'WARNING'}); + } + else { + finish("OK - $percent% ($used kB) used.$perfdata",$exit_codes{'OK'}); + } + } +} + +# Show usage +sub usage() { + print "\ncheck_mem.pl v1.0 - Nagios Plugin\n\n"; + print "usage:\n"; + print " check_mem.pl -<f|u> -w <warnlevel> -c <critlevel>\n\n"; + print "options:\n"; + print " -f Check FREE memory\n"; + print " -u Check USED memory\n"; + print " -C Count OS caches as FREE memory\n"; + print " -w PERCENT Percent free/used when to warn\n"; + print " -c PERCENT Percent free/used when critical\n"; + print "\nCopyright (C) 2000 Dan Larsson <dl\@tyfon.net>\n"; + print "check_mem.pl comes with absolutely NO WARRANTY either implied or explicit\n"; + print "This program is licensed under the terms of the\n"; + print "MIT License (check source code for details)\n"; + exit $exit_codes{'UNKNOWN'}; +} + +sub get_memory_info { + my $used_memory_kb = 0; + my $free_memory_kb = 0; + my $total_memory_kb = 0; + my $caches_kb = 0; + + my $uname; + if ( -e '/usr/bin/uname') { + $uname = `/usr/bin/uname -a`; + } + elsif ( -e '/bin/uname') { + $uname = `/bin/uname -a`; + } + else { + die "Unable to find uname in /usr/bin or /bin!\n"; + } + print "uname returns $uname" if ($opt_v); + if ( $uname =~ /Linux/ ) { + my @meminfo = `/bin/cat /proc/meminfo`; + foreach (@meminfo) { + chomp; + if (/^Mem(Total|Free):\s+(\d+) kB/) { + my $counter_name = $1; + if ($counter_name eq 'Free') { + $free_memory_kb = $2; + } + elsif ($counter_name eq 'Total') { + $total_memory_kb = $2; + } + } + elsif (/^(Buffers|Cached|SReclaimable):\s+(\d+) kB/) { + $caches_kb += $2; + } + } + $used_memory_kb = $total_memory_kb - $free_memory_kb; + } + elsif ( $uname =~ /HP-UX/ ) { + # HP-UX, thanks to Christoph Fürstaller + my @meminfo = `/usr/bin/sudo /usr/local/bin/kmeminfo`; + foreach (@meminfo) { + chomp; + if (/^Physical memory\s\s+=\s+(\d+)\s+(\d+.\d)g/) { + $total_memory_kb = ($2 * 1024 * 1024); + } + elsif (/^Free memory\s\s+=\s+(\d+)\s+(\d+.\d)g/) { + $free_memory_kb = ($2 * 1024 * 1024); + } + } + $used_memory_kb = $total_memory_kb - $free_memory_kb; + } + elsif ( $uname =~ /FreeBSD/ ) { + # The FreeBSD case. 2013-03-19 www.claudiokuenzler.com + # free mem = Inactive*Page Size + Cache*Page Size + Free*Page Size + my $pagesize = `sysctl vm.stats.vm.v_page_size`; + $pagesize =~ s/[^0-9]//g; + my $mem_inactive = 0; + my $mem_cache = 0; + my $mem_free = 0; + my $mem_total = 0; + my $free_memory = 0; + my @meminfo = `/sbin/sysctl vm.stats.vm`; + foreach (@meminfo) { + chomp; + if (/^vm.stats.vm.v_inactive_count:\s+(\d+)/) { + $mem_inactive = ($1 * $pagesize); + } + elsif (/^vm.stats.vm.v_cache_count:\s+(\d+)/) { + $mem_cache = ($1 * $pagesize); + } + elsif (/^vm.stats.vm.v_free_count:\s+(\d+)/) { + $mem_free = ($1 * $pagesize); + } + elsif (/^vm.stats.vm.v_page_count:\s+(\d+)/) { + $mem_total = ($1 * $pagesize); + } + } + $free_memory = $mem_inactive + $mem_cache + $mem_free; + $free_memory_kb = ( $free_memory / 1024); + $total_memory_kb = ( $mem_total / 1024); + $used_memory_kb = $total_memory_kb - $free_memory_kb; + $caches_kb = ($mem_cache / 1024); + } + elsif ( $uname =~ /joyent/ ) { + # The SmartOS case. 2014-01-10 www.claudiokuenzler.com + # free mem = pagesfree * pagesize + my $pagesize = `pagesize`; + my $phys_pages = `kstat -p unix:0:system_pages:pagestotal | awk '{print \$NF}'`; + my $free_pages = `kstat -p unix:0:system_pages:pagesfree | awk '{print \$NF}'`; + my $arc_size = `kstat -p zfs:0:arcstats:size | awk '{print \$NF}'`; + my $arc_size_kb = $arc_size / 1024; + + print "Pagesize is $pagesize" if ($opt_v); + print "Total pages is $phys_pages" if ($opt_v); + print "Free pages is $free_pages" if ($opt_v); + print "Arc size is $arc_size" if ($opt_v); + + $caches_kb += $arc_size_kb; + + $total_memory_kb = $phys_pages * $pagesize / 1024; + $free_memory_kb = $free_pages * $pagesize / 1024; + $used_memory_kb = $total_memory_kb - $free_memory_kb; + } + elsif ( $uname =~ /SunOS/ ) { + eval "use Sun::Solaris::Kstat"; + if ($@) { #Kstat not available + if ($opt_C) { + print "You can't report on Solaris caches without Sun::Solaris::Kstat available!\n"; + exit $exit_codes{UNKNOWN}; + } + my @vmstat = `/usr/bin/vmstat 1 2`; + my $line; + foreach (@vmstat) { + chomp; + $line = $_; + } + $free_memory_kb = (split(/ /,$line))[5] / 1024; + my @prtconf = `/usr/sbin/prtconf`; + foreach (@prtconf) { + if (/^Memory size: (\d+) Megabytes/) { + $total_memory_kb = $1 * 1024; + } + } + $used_memory_kb = $total_memory_kb - $free_memory_kb; + + } + else { # We have kstat + my $kstat = Sun::Solaris::Kstat->new(); + my $phys_pages = ${kstat}->{unix}->{0}->{system_pages}->{physmem}; + my $free_pages = ${kstat}->{unix}->{0}->{system_pages}->{freemem}; + # We probably should account for UFS caching here, but it's unclear + # to me how to determine UFS's cache size. There's inode_cache, + # and maybe the physmem variable in the system_pages module?? + # In the real world, it looks to be so small as not to really matter, + # so we don't grab it. If someone can give me code that does this, + # I'd be glad to put it in. + my $arc_size = (exists ${kstat}->{zfs} && ${kstat}->{zfs}->{0}->{arcstats}->{size}) ? + ${kstat}->{zfs}->{0}->{arcstats}->{size} / 1024 + : 0; + $caches_kb += $arc_size; + my $pagesize = `pagesize`; + + $total_memory_kb = $phys_pages * $pagesize / 1024; + $free_memory_kb = $free_pages * $pagesize / 1024; + $used_memory_kb = $total_memory_kb - $free_memory_kb; + } + } + elsif ( $uname =~ /Darwin/ ) { + $total_memory_kb = (split(/ /,`/usr/sbin/sysctl hw.memsize`))[1]/1024; + my $pagesize = (split(/ /,`/usr/sbin/sysctl hw.pagesize`))[1]; + $caches_kb = 0; + my @vm_stat = `/usr/bin/vm_stat`; + foreach (@vm_stat) { + chomp; + if (/^(Pages free):\s+(\d+)\.$/) { + $free_memory_kb = $2*$pagesize/1024; + } + # 'caching' concept works different on MACH + # this should be a reasonable approximation + elsif (/^Pages (inactive|purgable):\s+(\d+).$/) { + $caches_kb += $2*$pagesize/1024; + } + } + $used_memory_kb = $total_memory_kb - $free_memory_kb; + } + elsif ( $uname =~ /AIX/ ) { + my @meminfo = `/usr/bin/vmstat -vh`; + foreach (@meminfo) { + chomp; + if (/^\s*([0-9.]+)\s+(.*)/) { + my $counter_name = $2; + if ($counter_name eq 'memory pages') { + $total_memory_kb = $1*4; + } + if ($counter_name eq 'free pages') { + $free_memory_kb = $1*4; + } + if ($counter_name eq 'file pages') { + $caches_kb = $1*4; + } + if ($counter_name eq 'Number of 4k page frames loaned') { + $free_memory_kb += $1*4; + } + } + } + $used_memory_kb = $total_memory_kb - $free_memory_kb; + } + else { + if ($opt_C) { + print "You can't report on $uname caches!\n"; + exit $exit_codes{UNKNOWN}; + } + my $command_line = `vmstat | tail -1 | awk '{print \$4,\$5}'`; + chomp $command_line; + my @memlist = split(/ /, $command_line); + + # Define the calculating scalars + $used_memory_kb = $memlist[0]/1024; + $free_memory_kb = $memlist[1]/1024; + $total_memory_kb = $used_memory_kb + $free_memory_kb; + } + return ($free_memory_kb,$used_memory_kb,$caches_kb); +} + +sub init { + # Get the options + if ($#ARGV le 0) { + &usage; + } + else { + getopts('c:fuCvw:'); + } + + # Shortcircuit the switches + if (!$opt_w or $opt_w == 0 or !$opt_c or $opt_c == 0) { + print "*** You must define WARN and CRITICAL levels!\n"; + &usage; + } + elsif (!$opt_f and !$opt_u) { + print "*** You must select to monitor either USED or FREE memory!\n"; + &usage; + } + + # Check if levels are sane + if ($opt_w <= $opt_c and $opt_f) { + print "*** WARN level must not be less than CRITICAL when checking FREE memory!\n"; + &usage; + } + elsif ($opt_w >= $opt_c and $opt_u) { + print "*** WARN level must not be greater than CRITICAL when checking USED memory!\n"; + &usage; + } +} + +sub finish { + my ($msg,$state) = @_; + print "$msg\n"; + exit $state; +} |