Nagios 监控使用--插件使用(二)

10） 安装配置NDOUtils

NDOUtils是一个插件，让您的数据存储Nagios （当前状态信息，历史状态，历史的通知等）在MySQL数据库。

准备软件包

• GCC-C++
• MySQL
• MySQL-Devel
• MySQL-Server

使用yum安装所需组件

  yum -y install mysql mysql-devel mysql-server gcc-c++

  /etc/init.d/mysqld start

  chkconfig --add mysqld

  make sure it's running

  ps -ef | grep mysql

  安装ndoutils

  cd /usr/local/nagios-share

  wget  

  tar zxfv ndoutils-1.4b7.tar.gz

  cd  ndoutils-1.4b7

  ./configure

  make

  创建NDO 数据库

  mysql -u root –p root123

  mysql>create  database  nagios;

  Query OK, 1 row affected (0.00 sec)

  mysql>show databases;

  +----------+

  | Database |

  +----------+

  | database |

  | mysql    |

  | nagios   |

  | test     |

  +----------+

  4 rows in set (0.01 sec)

  mysql -u root -p nagios <  db/mysql.sql

  mysql -u root -p nagios <  db/mysql-mods-1.4b7.sql

  mysql> GRANT SELECT , INSERT , UPDATE , DELETE ON `nagios`.* TO mysql>'nagios'@'localhost';

  mysql>FLUSH PRIVILEGES;

  复制ndomod 和ndo2db

  ndomod-2x.o = NDOMOD module for Nagios 2.x ndomod-3x.o = NDOMOD module for Nagios 3.x (unstable)

  cp /src/ndomod-3x.o /usr/local/nagios/bin/ndomod.o

  ndo2db-2x.o = NDO2DB daemon for Nagios 2.x ndo2db-3x.o = NDO2DB daemon for Nagios 3.x (unstable)

  cp  src/ndo2db-3x /usr/local/nagios/bin/ndo2db

  配置ndo2db.cfg

  cp /config/ndo2db.cfg /usr/local/nagios/etc/nagios/

  修改 ndo2db.cfg 文件

  # SOCKET TYPE

  # This option determines what type of socket the daemon will create

  # an accept connections from.

  # Value:

  #   unix = Unix domain socket (default)

  #   tcp  = TCP socket

  socket_type=unix

  #socket_type=tcp

  . . .

  # SOCKET NAME

  # This option determines the name and path of the UNIX domain 

  # socket that the daemon will create and accept connections from.

  # This option is only valid if the socket type specified above

  # is "unix".

  #socket_name=/usr/local/nagios/var/ndo.sock

  socket_name=/var/run/nagios/ndo.sock

  . . .

  # DATABASE USERNAME/PASSWORD

  # This is the username/password that will be used to authenticate to the DB.

  # The user needs at least SELECT, INSERT, UPDATE, and DELETE privileges on

  # the database.

  #db_user=ndouser

  #db_pass=ndopassword

  db_user=nagios

  db_pass=nagios

 

  mkdir /var/run/nagios

  chmod -R nagios:nagios /var/run/nagios

  配置ndomod.cfg

  cp  /config/ndomod.cfg   /usr/local/nagios/etc/nagios/

  在/usr/local/nagios/etc/nagios.cfg中增加一行

  broker_module=/usr/local/nagios/bin/ndomod.o config_file=/usr/local/nagios/etc/ndomod.cfg 确认有以下参数

         event_broker_options=-1

  编辑 ndomod.cfg 设置

  output=/var/run/nagios/ndo.sock

  和ndo2db.cfg中的 socket_name 参数设置一样

  [1192222122] ndomod: Error writing to data sink!  Some output may get lost...

  启动 NDO2DB 进程

  /usr/local/nagios/bin/ndo2db –c /usr/local/nagios/etc/nagios/ndo2db.cfg

  [root@localhost nagios]# ps -ef | grep ndo2db

  nagios   26516     1  0 19:36 ?        00:00:00 ndo2db -c /etc/nagios/ndo2db.cfg

  root     26536 26460  0 19:40 pts/0    00:00:00 grep ndo

  [root@localhost nagios]#

  重启 Nagios

  /etc/init.d/nagios restart

  查看是否正常

  tail /var/log/messages

  Jun 19 12:38:16 Centos5 nagios: LOG VERSION: 2.0

  Jun 19 12:38:16 Centos5 nagios: ndomod: NDOMOD 1.4b7 (10-31-2007) Copyright (c) 2005-2007 Ethan Galstad ([e-mail])

  Jun 19 12:38:16 Centos5 ndo2db: Successfully connected to MySQL database

  Jun 19 12:38:16 Centos5 nagios: ndomod: Successfully connected to data sink.  0 queued items to flush.

  Jun 19 12:38:16 Centos5 nagios: Event broker module '/usr/local/nagios/bin/ndomod.o' initialized successfully.

  Jun 19 12:38:16 Centos5 nagios: Finished daemonizing... (New PID=22322)

  Jun 19 13:38:16 Centos5 nagios: Auto-save of retention data completed successfully.

 

 

11）NRPE配置

NRPE是nagios的一个扩展，它被用于被监控的服务器上，向nagios监控平台提供该服务器的一些本地的情况。例如，cpu负载、内存使用、硬盘使用等等。NRPE可以称为nagios的for linux 客户端。

 

监控平台上的安装：

先安装 openssl-devel

 yum install openssl-devel

Installing for dependencies: e2fsprogs-devel krb5-devel

再安装 NRPE:

   tar zxvf nrpe-2.12.tar.gz

cd nrpe-2.12

./configure

make all

make install-plugin

在 objects/commands.cfg 中定义 check_nrpe 使用的命令：

  # 'check_nrpe' command definition

define command{

        command_name    check_nrpe

        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$

        }

被监控主机的安装：
同样需要安装 openssl-devel
创建 nagios 用户和组
groupadd nagios
useradd -g nagios -d /usr/local/nagios -s /sbin/nologin nagios

 

  先安装 nagios-plugin: tar zxvf nagios-plugins-1.4.12.tar.gz

cd nagios-plugins-1.4.12

./configure --prefix=/usr/local/nagios

make

make install

再安装 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

  chown -R nagios:nagios /usr/local/nagios

配置 NRPE:
vi /usr/local/nagios/etc/nrpe.cfg
allowed_hosts=127.0.0.1,            $Nagios监控平台的地址或域名

启动 NRPE 守护进程：
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
可以将此命令加入 /etc/rc.local ，以便开机自动启动。

检查 NRPE 是否正常：
在被监控主机上
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1
在监控平台上
/usr/local/nagios/libexec/check_nrpe -H $目标主机地址
都应该可以输出 NRPE 的版本： NRPE v2.12

在被监控端的 nrpe.cfg 文件中，可以看到这样的配置：
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
这是用来检查 CPU 负载的。

这样，就可以在监控平台上定义如下服务来监控被监控端的 CPU 负载了：

  define service{

host_name remotehost

service_description check_load

...

check_command check_nrpe!check_load }

 

 

 

 

引用文档：