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监控服务器:RHEL4(192.168.1.211)+nagios-3.2.0+ nagios-plugins-1.4.14+ nrpe-2.12

被监控端RHEL4 (192.168.1.212)+ nagios-plugins-1.4.14+ nrpe_2.12

内容简介

本文档介绍nagios监控linux服务器, 因为监控都是依靠插件去完成的，而监控linux主要使用NRPE插件,本文首先简单介绍一下NRPE监控基础,及监控过程,然后一步步的配置一个实例实现监控linux服务器

1.NRPE监控插件基础

NRPE总共由两部分组成:

check_nrpe插件,运行在监控主机上。

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:(如下图)

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NRPE daemon.

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. 别外因为它们间的通信是加密的SSL,所以在编译安装时都要加上选项, ./configure --enable-ssl --with-ssl-lib=/lib/,否则也会出错.

2.配置监控端

1.安装nagios
./configure --prefix=/opt/nagios --with-command-group=nagcmd --with-gd-lib=/usr/lib --with-gd-inc=/usr/include
make all
make install
make install-init
make install-config
make install-commandmode
(make install-webconf #可以自动配置httpd.conf)
cp sample-config/httpd.conf /opt/apache/conf/extra/nagios.conf

/opt/apache/bin/htpasswd -c /opt/nagios/etc/htpasswd.users nagiosadmin
(nagiosadmin 要与 /opt/nagios/etc/objects/contacts.cfg 里的 contact_name 相同)

groupadd nagios

useradd -g nagios nagios

passwd nagios

2.安装nagios-plugins
cd nagios-plugins-1.4.12
./configure --prefix=/opt/nagios --with-nagios-user=nagios --with-nagios-group=nagios --enable-redhat-pthread-workaround
make
make install

3.安装NRPE
cd nagios-nrpe_2.12
./configure #默认自动添加了openssl
./configure --prefix=/opt/nagios --enable-ssl --with-ssl-lib=/lib/(当然前提要有openssl)
make all
make install-plugin

make install-daemon

make install-daemon-config

4.commands.cfg定义外部构件nrpe
vi /opt/nagios/etc/objects/commands.cfg
#添加
#check nrpe
define command{
        command_name check_nrpe
        command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
        }

.配置要监控的linux主机
vi /opt/nagios/etc/nagios.cfg
#中间添加
cfg_file=/opt/nagios/etc/objects/mylinux.cfg

6.新建mylinux.cfg 设置监控内容
vi /usr/local/nagios/etc/objects/mylinux.cfg
define host{
           use             linux-server
          host_name     mylinux
          alias            mylinux
          # 客户端IP
          address        192.168.1.212
        }
define service{
        use                      generic-service
        host_name             mylinux
        service_description     check-swap
        check_command        check_nrpe!check_swap
               }
define service{
        use                      generic-service
        host_name             mylinux
        service_description     check-load
       check_command         check_nrpe!check_load
               }
define service{
        use                      generic-service
        host_name             mylinux
       service_description     check-disk
       check_command        check_nrpe!check_hda1 }
define service{
        use                      generic-service
        host_name             mylinux
       service_description     check-users
       check_command        check_nrpe!check_users
               }
define service{
        use                    generic-service
        host_name           mylinux
        service_description otal_procs
        check_command     check_nrpe!check_total_procs
}

6.其它设置
chkconfig --add nagios #配置机器启动时自动启动Nagios
chkconfig nagios on
/opt/nagios/bin/nagios -v /opt/nagios/etc/nagios.cfg #检查Nagios配置文件
vi /etc/selinux/config #关闭SELinux
SELINUX=disabled
service iptables stop #关闭SELinux,或打开80,5666端口
service nagios start

3.配置被监控端
1.安装nagios-plugin
useradd nagios
tar -zxvf nagios-plugins-1.4.12.tar.gz
cd nagios-plugins-1.4.12
./configure --prefix=/opt/nagios-plugins/ --with-nagios-user=nagios --with-nagios-group=nagios --enable-redhat-pthread-workaround
make
make install

2.改变主目录权限
chown –R nagios:nagios /opt/nagios-plugins
[root@client nagios]# ll
drwxr-xr-x 2 nagios nagios 4096 Jun 1 00:07 libexec
drwxr-xr-x 3 nagios nagios 4096 Jun 1 00:07 share

3.安装客户端的nrpe
tar -zxvf nrpe_2.12.tar.gz
cd nrpe_2.12
./configure --prefix=/opt/nagios-plugins --enable-ssl --with-ssl-lib=/usr/lib/(当然前提要有openssl)
make all
make install-plugin
make install-daemon
make install-daemon-config

4.配置nrpe信息
vi /opt/nagios-plugins/etc/nrpe.cfg
allowed_hosts=127.0.0.1,192.168.1.211

5.启动nrpe
/opt/nagios-plugins/bin/nrpe -c /opt/nagios-plugins/etc/nrpe.cfg –d
#或
vi /etc/rc.d/rc.local
/opt/nagios-plugins/bin/nrpe -c /opt/nagios-plugins/etc/nrpe.cfg –d

6.验证nrpe
netstat -an | grep 5666
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN
/opt/nagios-plugins/libexec/check_nrpe -H 127.0.0.1
NRPE v2.8.12
#服务端测试
/opt/nagios-plugins/libexec/check_nrpe -H l92.168.1.212 -p 5666 -c check_load
NRPE v2.8.12

7.配置监控对像(关键)
由监控原理可知被监控端做监控然后传给监控服务器绘总,设置监控详细参数主要是设置被监控端的nrpe.cfg文件
可以看到里面监控对象
vi /opt/nagios-plugins/etc/nrpe.cfg
command[check_users]=/opt/nagios-plugins/libexec/check_users -w 5 -c 10
command[check_load]=/opt/nagios-plugins/libexec/check_load -w 15,10,5 -c 30,25,20
command[check_hda1]=/opt/nagios/libexec-plugins/check_disk -w 20 -c 10 -p /dev/hda1
command[check_zombie_procs]=/opt/nagios-plugins/libexec/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/opt/nagios-plugins/libexec/check_procs -w 150 -c 200
command[check_swap]=/opt/nagios-plugins/libexec/check_swap -w 20% -c 10%

这一步是关键,如果nagios服务器想要监控客户机swap分区,但客户机nrpe.cfg文件没有swap监控对像,这时监控服务器就是报错(NRPE command ‘check_swap’no defined).如下图:其实平时自己写脚本,也是主要配这个地方

到此,就可以监控linux客户机的Disk,swap,users,memory了.

监控端进程启动方式:
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg

被监控端进程启动方式:
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d

文章出自:http://blog.sina.com.cn/s/blog_5ce87d560100g8vm.html

http://blog.chinaunix.net/space.php?uid=7530389&do=blog&id=2050036

ITPub博客

Nagios监控软件安装(转)

1.NRPE监控插件基础

2.配置监控端

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