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--- blog:plugin_to_check_free_server_memory_with_nagios [2011-08-08 19:43] – brb
+++ blog:plugin_to_check_free_server_memory_with_nagios [2011-08-08 19:47] (current) – brb
@@ Line 3: / Line 3: @@
 Great plugin,
-<code perl>
+[[:blogfiles:check_mem.pl]]
-#!/usr/bin/perl -w
-# $Id: check_mem.pl 2 2002-02-28 06:42:51Z egalstad $
-# Original script stolen from:
-# check_mem.pl Copyright (C) 2000 Dan Larsson <dl@tyfon.net>
-# hacked by
-# Justin Ellison <justin@techadvise.com>
-#
-# 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; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty
-# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# you should have received a copy of the GNU General Public License
-# along with this program (or with Nagios);  if not, write to the
-# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA 02111-1307, USA
-# 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 $opt_v %exit_codes);
-%exit_codes   = ('UNKNOWN' ,-1,
-        		 'OK'      , 0,
-                 'WARNING' , 1,
-                 'CRITICAL', 2,
-                 );
-# Get our variables, do our checking:
-init();
-# Get the numbers:
-my ($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 $perfdata = "|TOTAL=${total}KB;;;; USED=${used}KB;;;; FREE=${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 "GNU General Public 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):\s+(\d+) kB/) {
-                $caches_kb += $2;
-            }
-        }
-        $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 - $free_memory_kb;
-        }
-    }
-    else {
-        if ($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;
-}
-</code>
 Ref: http://www.sysadminsjourney.com/content/2009/06/04/new-and-improved-checkmempl-nagios-plugin?nocache=1