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