利用perl脚本检测redis(nagios插件)附安装操作说明

作者：阿辉
http://farmerluo.googlecode.com/files/check_redis.pl

介绍下怎么安装：
脚本用到了perl的Redis库，需要先安装这个：
# perl -MCPAN -e shell
# install Redis

wget http://farmerluo.googlecode.com/files/check_redis.pl

cp check_redis.pl /etc/nagios/command/

chown cacti.nagios check_redis.pl

在nagios内加入这个插件：

vi /etc/nagios/objects/command.cfg

# \'check_redis\' command definition
define command{
command_name check_redis
command_line /etc/nagios/command/check_redis.pl -h $HOSTADDRESS$ $ARG1$
}

加入一个服务：
vi /etc/nagios/objects/linuxhost.cfg

define service{
use                            generic-service       ; Name of service template to use
host_name                      memcached.ha2,memcached.web2
service_description          redis
check_command                check_redis
notifications_enabled          1
}

检查下nagios配置是否正解：
nagios -v  /etc/nagios/nagios.cfg

Nagios Core 3.2.1
Copyright (c) 2009-2010 Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 03-09-2010
License: GPL

Website: http://www.nagios.org
Reading configuration data...
Read main config file okay...
Processing object config file \'/etc/nagios/objects/commands.cfg\'...
Processing object config file \'/etc/nagios/objects/contacts.cfg\'...
Processing object config file \'/etc/nagios/objects/timeperiods.cfg\'...
Processing object config file \'/etc/nagios/objects/templates.cfg\'...
Processing object config file \'/etc/nagios/objects/linuxhosts.cfg\'...
Processing object config file \'/etc/nagios/objects/windows.cfg\'...
Read object config files okay...

Running pre-flight check on configuration data...

Checking services...
Checked 32 services.
Checking hosts...
Checked 14 hosts.
Checking host groups...
Checked 4 host groups.
Checking service groups...
Checked 0 service groups.
Checking contacts...
Checked 3 contacts.
Checking contact groups...
Checked 2 contact groups.
Checking service escalations...
Checked 0 service escalations.
Checking service dependencies...
Checked 0 service dependencies.
Checking host escalations...
Checked 0 host escalations.
Checking host dependencies...
Checked 0 host dependencies.
Checking commands...
Checked 29 commands.
Checking time periods...
Checked 5 time periods.
Checking for circular paths between hosts...
Checking for circular host and service dependencies...
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...

Total Warnings: 0
Total Errors: 0

Things look okay - No serious problems were detected during the pre-flight check

没问题，我们重新载入配置。

service nagios reload

再介绍一下用perl写nagios插件需要注意的地方：

1. 总是要生成一些输出内容；
2. 加上引用\'use utils\'并引用些通用模块来输出($TIMEOUT %ERRORS &print_revision &支持等)；
3. 总是知道一些Perl插件的标准习惯，如：
      1. 退出时总是exit带着$ERRORS{CRITICAL}、$ERRORS{OK}等；
      2. 使用getopt函数来处理命令行；
      3. 程序处理超时问题；
      4. 当没有命令参数时要给出可调用print_usage；
      5. 使用标准的命令行选项开关(象-H \'host\'、-V \'version\'等)。

check_redisl.pl代码：

#!/usr/bin/perl

# nagios: -epn

################################################################################
# check_redis - Nagios Plugin for Redis checks.
#
# @author farmer.luo at gmail.com
# @date 2010-05-12
# @license GPL v2
#
# check_nagios.pl -h <redis host> -p <redis port> -w <warning time> -c <critica time>
#
# Run the script need:
#
# perl -MCPAN -e shell
# install Redis
#
################################################################################

use strict;
use warnings;
use Redis;
use File::Basename;
use utils qw($TIMEOUT %ERRORS &print_revision &support);
use Time::Local;
use vars qw($opt_h); # Redis 主机
use vars qw($opt_p); # Redis 端口
use vars qw($opt_w); # 超过这个时间发出警告
use vars qw($opt_c); # 超过这个时间发出严重警告
use Getopt::Std;

$opt_h = ;
$opt_p = 6379;
$opt_w = 5;
$opt_c = 10;
my $r = ;

getopt(\'hpwcd\');

if ( $opt_h eq ) {
help();
exit(1);
}

my $start = time();

redis_connect();

# print $@;
if ( $@ ) {
print UNKNOWN - cann\'t connect to redis server: . $opt_h . .;
exit $ERRORS{UNKNOWN};
}

if ( redis_set() ) {
print WARNING - redis server: . $opt_h . ,set key error.;
exit $ERRORS{WARNING};
}

if ( redis_get() ) {
print WARNING - redis server: . $opt_h . ,get key error.;
exit $ERRORS{WARNING};
}

if ( redis_del() ) {
print WARNING - redis server: . $opt_h . ,del key error.;
exit $ERRORS{WARNING};
}

#sleep(3);
my $stop = time();

my $run = $stop - $start;

if ( $run > $opt_c ) {

print CRITICAL - redis server( . $opt_h . ) run for . $run . seconds!;
exit $ERRORS{CRITICAL};

} elsif ( $run > $opt_w ) {

print WARNING - redis server( . $opt_h . ) run for . $run . seconds!;
exit $ERRORS{WARNING};

} else {

redis_info();
redis_quit();
exit $ERRORS{OK};

}

sub help{

die Usage:n , basename( $0 ) , -h hostname -p port -w warning time -c critical time -d down timen

}

sub redis_connect{

my $redis_hp = $opt_h . : . $opt_p;

eval{ $r = Redis->new( server => $redis_hp ); };

}

sub redis_set{

$r->set( redis_nagios_key => \'test\' ) || return 1;

return 0;
}

sub redis_get{

my $value = $r->get( \'redis_nagios_key\' ) || return 1;

return 0;
}

sub redis_del{

$r->del( \'redis_nagios_key\' ) || return 1;

return 0;
}

sub redis_info{

my $info_hash = $r->info;

print OK - redis server( . $opt_h . ) info:;

while ( my ($key, $value) = each(%$info_hash) ) {
print $key => $value, ;
}

}

sub redis_quit{

$r->quit();

}

Tags： nagios perl redis