NRPE监控插件基础
NRPE总共由两部分组成:
(1).check_nrpe插件,运行在监控主机上。
(2).NRPE daemon,运行在远程的linux主机上(通常就是被监控机)
整个的监控过程如下:
当Nagios需要监控某个远程linux主机的服务或者资源情况时：
1).nagios会运行check_nrpe插件,我们要在nagios配置文件中告诉它要检查什么.
2).check_nrpe插件会通过SSL连接到远程的NRPEdaemon.
3).NRPE daemon会运行相应的nagios插件来执行检查本地资源或服务.
4).NRPE daemon将检查的结果返回给check_nrpe插件,插件将其递交给nagios做处理.
注意:NRPE daemon需要nagios插件安装在远程被监控linux主机上,否则,daemon不能做任何的监控.
Nagios被监控端安装
Step1
安装nagios-plugin
useradd -s /sbin/nologin nagios
mkdir /usr/local/nagios
chown -R nagios.nagios /usr/local/nagios
tar -zxvf nagios-plugins-1.4.13.tar.gz
cd nagios-plugins-1.4.13
./configure --prefix=/usr/local/nagios
make && make install
这一步完成后会在/usr/local/nagios/下生成两个目录libexec和share
Step2
改变主目录权限
chown -R nagios.nagios /usr/local/nagios
Step3
安装客户端的nrpe
tar -zxvf nrpe-2.12.tar.gz
cd nrpe-2.12
./configure
make all
make install-plugin
make install-daemon
make install-daemon-config
Step4
配置nrpe信息
vi/usr/local/nagios/etc/nrpe.cfg
将allowed_hosts=127.0.0.1
修改成你的nagios服务器的ip
Step5
启动nrpe
/usr/local/nagios/bin/nrpe -c/usr/local/nagios/etc/nrpe.cfg -d
验证nrpe
netstat -an|grep 5666 察看是否在5666端口上监听
测试连通性
/usr/local/nagios/libexec/check_nrpe -Hlocalhost
察看是否能返回nrpv版本号，返回则正常！
Step6
vi /usr/local/nagios/etc/nrpe.cfg
可以看到里面监控对象
# The following examples use hardcoded command arguments...
command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 -p/dev/hda1
command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -sZ
command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200
我们为了监控swap
在nrpe.cfg中添加
command[check_swap]=/usr/local/nagios/libexec/check_swap -w 20% -c 10%
注意：添加监控新项目所用的命令都在客户端的nrpe.cfg中添加
添加之后再次启动nrpe
先杀掉后台进程，然后kill-9 进程号
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg –d
安装服务端nrpe
setp1
tar -zxvf nagios-nrpe_2.8.1.orig.tar.gz
cd nagios-nrpe_2.8.1
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make all
make install-plugin
然后我们测试下连通性
/usr/local/nagios/libexec/check_nrpe -H 被监控端ip
如果返回nrpe版本号，那么正常！
如果返回拒绝连接！那么telnet ip 5666看是否正常
step2
配置nrpe添加支持：
由于nrpe外构组件，所以必须在nagios服务器端得commands.cfg中定义 [root@localhost etc]# vi /usr/local/nagios/etc/objects/commands.cfg
最下面添加
#check nrpe
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H$HOSTADDRESS$ -c $ARG1$
}
step3
配置要监控的linux主机和服务，这里我们集中到了一起 以甜豆为例
[root@localhost etc]# vi /usr/local/nagios/etc/nagios.cfg
中间添加
cfg_file=/usr/local/nagios/etc/objects/servers/td.cfg
配置文件的名字可以自己定义
=================================================
新建td.cfg
[root@localhost etc]# vi /usr/local/nagios/etc/objects/servers/td.cfg
添加
define host{
use linux-server,hosts-pnp
host_name td-h2
alias td
address x.x.x.x
hostgroups td
max_check_attempts 10
}
define host{
use linux-server,hosts-pnp
host_name td-76
alias td
address x.x.x.x
hostgroups td
max_check_attempts 10
}
define host{
use linux-server,hosts-pnp
host_name td-77
alias td
address x.x.x.x
hostgroups td
max_check_attempts 10
}
define host{
use linux-server,hosts-pnp
host_name td-78
alias td
address x.x.x.x
hostgroups td
max_check_attempts 10
}
--沿着上面格式，依次定义主机
--定义主机组
define hostgroup{
hostgroup_name td
alias td
members td-h2,td-76,td-77,td-78
}
--定义服务
define service{
use local-service,services-pnp ; Name of service template to use
host_name td-h2,td-76,td-77,td-78
service_description check_tps
check_command nrpe!check_tps
}
define service{
use local-service,services-pnp ; Name of service template to use
host_name td-h2,td-76,td-77,td-78
service_description check_qps
check_command nrpe!check_qps
}
define service{
use local-service,services-pnp ; Name of service template to use
host_name td-h2,td-76,td-77,td-78
service_description check_connect
check_command nrpe!check_connect
}
配置完毕 检测配置文件是否正确
/usr/local/nagios/bin/nagios-v /usr/local/nagios/etc/nagios.cfg
正确的话，重新启动nagios
监控mysql服务安装插件check_mysql_health 插件，在被监控端
1)、在要监控mysql主机上面建立监控用户，用作mysql监控服务使用。赋权能使用即可,注意安全性
grant select,update,insert,delete on test.* to'my_perfor'@'localhost' identified by 'my_perfor';
2)、在nagios监控服务器上安装check_mysql_health插件.
tar -zxvf check_mysql_health-2.1.7.tar.gz
cd check_mysql_health-2.1.7
./configure --prefix=/usr/local/nagios--with-nagios-user=nagios --with-nagios-group=nagios --with-perl=/usr/bin/perl
make && make install
安装 perl-DBD-MySQL包，同时yum工具会把需要的包都安装上包含perl-DBI
yum install -y perl-DBD-MySQL
安装完毕 可以验证一下查看一下索引情况
./check_mysql_health--socket=/usr/local/mysql/tmp/mysql.sock --port 3306 --username my_perfor --passwordmy_perfor --warning 180 --critical 220 --mode threads-connected
check_mysql_health依赖于软件包 注意64位和32位服务器的区别
yum install -y perl-DBD-MySQL perl-DBI # check_mysql_health使用需要这二个发安装包 如下在65位服务器上 安装 mysql版本5.0.8
yum 安装很方便，会安装上依赖的包
没有安装软件包运行 check_mysql_health时报以下错误
缺少 perl-dbd-mysql包,报如下错误
CRITICAL - cannot connect to information_schema.install_driver(mysql) failed: Can't locate DBD/mysql.pm in @INC (@INC contains:. /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl/usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi/usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl/usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8) at (eval13) line 3.
Perhaps the DBD::mysql perl module hasn't been fully installed,
or perhaps the capitalisation of 'mysql' isn't right.
Available drivers: DBM, ExampleP, File, Gofer, Proxy, Sponge.
at ./check_mysql_health line 1862
在32位服务器上可能会出现如下问题
在运行./check_mysql_health出现以下错误提示,
[root@file]# ./check_mysql_health
-bash: ./check_mysql_health: yes: badinterpreter: No such file or directory
解决方法
因为check_mysql_health是用perl写的，将check_mysql_health的第一行由原来的#！ yes -w修改为#!/usr/bin/perl，这样就OK了