客户端修改：
1、进入/usr/lib64/nagios/plugins目录下并更改脚本权限
cd /usr/lib64/nagios/plugins vim check_memory
#!/usr/bin/perl -w # $Id: check_memory 2 2002-02-28 06:42:51Z egalstad $ # Original script stolen from: # check_memory Copyright (C) 2000 Dan Larsson # hacked by # Justin Ellison # # 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_memory v1.0 - Nagios Plugin\n\n"; print "usage:\n"; print " check_memory - -w -c \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 \n"; print "check_memory 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; } } elsif ( $uname =~ /AIX/ ) { my @meminfo = `/usr/bin/vmstat -v`; 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; } } } $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; }
chmod 755 check_memory
2、修改nrpe配置文件
vim /etc/nagios/nrpe.cfg ###添加以下内容 command[check_free_mem]=/usr/lib64/nagios/plugins/check_memory -f -w 10 -c 5
3、重启nrpe服务
/etc/init.d/nrep restart
服务端的配置
1、修改主机配置文件
cd /etc/nagios/conf.d/
添加以下内容
vim vsftp_222.cfg
define service{
use generic-service
host_name vsftp_222
service_description check_memory
check_command check_nrpe!check_memory
register 1
}2、检查配置文件正确性并重载配置文件
nagios -v /etc/nagios/nagios.cfg /etc/init.d/nagios restart
3、配置完毕，过一会监控内存使用情况就出来了！
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