Nagios搭建与配置

Nagios 搭建与配置

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实验环境 centos6.5 两台

实验步骤

一.安装Nagios的依赖关系:

yum -y install httpd gcc glibc glibc-common gd gd-devel php php-MySQL mysql mysql-devel mysql-server xinetd

二.安装配置Nagios(监控本机)

  1. 添加nagios运行所需要的用户和组:

    useradd nagios 

  2. 把apache加入到nagios组 

    usermod -a -G nagios apache

  3. 上传nagios包,加压后编译安装nagios:

    tar -zxf nagios-4.0.3.tar.gz 

    cd nagios-4.0.3

    ./configure --with-command-group=nagios  --enable-event-broker 

    make all                                           (编译全部)

    make install                                       (安装)

    make install-init                                (生成启动脚本文件)

    make install-commandmode                         (设置组的执行权限)

    make install-config                             (生成配置文件)

    make install-webconf                             (安装nagios的web文件到httpd的conf.d目录下)  

  4. 为email指定您想用来接收nagios警告信息的邮件地址,默认是本机的nagios用户: 

    vim /usr/local/nagios/etc/objects/contacts.cfg 

  5. 修改配置 email        nagios@localhost       这个是默认设置

  6. 创建一个登录nagios web程序的用户,这个用户帐号在以后通过web登录nagios认证时所用:htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

  7. 以上过程配置结束以后需要启动httpd:

    /etc/init.d/httpd start

  8. 编译、安装nagios-plugins(插件)

    tar -zxf nagios-plugins-1.5.tar.gz 

    cd nagios-plugins-1.5

    ./configure --with-nagios-user=nagios --with-nagios-group=nagios

    make

    make install

  9. 检查其主配置文件的语法是否正确:

    /usr/local/nagios/bin/nagios -v   /usr/local/nagios/etc/nagios.cfg

  10. 如果上面的语法检查没有问题,接下来就可以正式启动nagios服务了: service nagios start

    关闭selinux:setenforce 0

    关闭防火墙:service iptables stop

    修改本地监控配置文件:vim /usr/local/nagios/etc/objects/localhost.cfg

  11. 通过web界面查看nagios:

    http://your_nagios_IP/nagios

    这时候已将可以监控Linux本机。浏览器测试:‘IP地址’/nagios

三.基于NRPE(桥梁)监控远程Linux主机

  1. 配置-监控端

1).安装NRPE

tar -xf nrpe-2.12.tar.gz

cd nrpe-2.12

./configure --with-nrpe-user=nagios \

     --with-nrpe-group=nagios \

     --with-nagios-user=nagios \

     --with-nagios-group=nagios \

     --enable-command-args \

     --enable-ssl

make all

make install-plugin                (设置插件权限)

2).添加策略

vim /usr/local/nagios/etc/objects/commands.cfg  

添加:define command{

        command_name    check_nrpe

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

        }

3).定义监控对象,复制一个模板 cp localhost.cfg linux.cfg

编辑模块文件:

vim linux.cfg           (:%s /localhost/linux/g[修改localhost为linux])

     host_name  linux

    address  被监控端的IP

将这五行注释掉            

define hostgroup{

       hostgroup_name  linux-servers ; The name of the hostgroup

      alias           Linux Servers ; Long name of the group

       members         linux     ; Comma separated list of hosts that belong to this group

       }

修改 check_command  为 check_nrpe_procs(中间的部分不用动只修改最后的部分)

4).添加模块

vim /usr/local/nagios/etc/objects/commands.cfg

添加:

define command{

        command_name    check_nrpe_disk

        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c "check_disk"

        }

define command{

        command_name    check_nrpe_users

        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c "check_users"

        }

define command{

        command_name    check_nrpe_procs

        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c "check_procs"

        }

define command{

        command_name    check_nrpe_load

        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c "check_load"

        }

define command{

        command_name    check_nrpe_swap

        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c "check_swap"

        }

vim vim /usr/local/nagios/etc/nagios.cfg 添加一条

cfg_file=/usr/local/nagios/etc/objects/linux.cfg

cd objects/

5).给权限:

chown nagios.nagios linux.cfg   chmod 664 linux.cfg

6).启动服务:

service nagios restart

2.安装配置-被监控端

1)先添加nagios用户

useradd -s /sbin/nologin nagios

2)NRPE依赖于nagios-plugins,因此,需要先安装nagios-plugins

tar -zxf nagios-plugins-1.5.tar.gz

cd nagios-plugins-1.5

./configure --with-nagios-user=nagios --with-nagios-group=nagios

make all

make install 

3)安装NRPE

tar -xf nrpe-2.12.tar.gz

cd nrpe-2.12.tar.gz

./configure --with-nrpe-user=nagios \

     --with-nrpe-group=nagios \

     --with-nagios-user=nagios \

     --with-nagios-group=nagios \

     --enable-command-args \

     --enable-ssl

make all

make install-plugin

make install-daemon

make install-daemon-config

make install-xinetd            (生成临时服务)

4).修改文件:

vim /etc/xinetd.d/nrpe   

only-from=127.0.0.1  10.1.1.2(这个是监控端nagios的IP)(nrpe允许以上IP的机器通过nrpe查询服务)

vim /etc/services  

文件最后添加一条:nrpe 5666/tcp  nrpe

5).启动守护进程

service xinetd start       

6).配置NRPE

vim /usr/local/nagios/etc/nrpe.cfg

log_facility=daemon

pid_file=/var/run/nrpe.pid

server_address=被监控端的IP

server_port=5666

nrpe_user=nagios

nrpe_group=nagios

allowed_hosts=监控端的IP

command_timeout=60

connection_timeout=300

debug=0

command[check_disk]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p / (记得修改!)

command[check_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200(记得修改!)

添加一条:command[check_swap]=/usr/local/nagios/libexec/check_disk -w 40% -c 20%

7).启动NRPE

/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg –d(临时启动)

或者将如下内容定义为vim /etc/init.d/nrped脚本:

!/bin/bash

chkconfig: 2345 88 12

description: NRPE DAEMON

NRPE=/usr/local/nagios/bin/nrpe

NRPECONF=/usr/local/nagios/etc/nrpe.cfg

case "$1" in

start)

echo -n "Starting NRPE daemon..."

$NRPE -c $NRPECONF -d

echo " done."

;;

stop)

echo -n "Stopping NRPE daemon..."

pkill -u nagios nrpe

echo " done."

;;

restart)

$0 stop

sleep 2

$0 start

;;

*)

echo "Usage: $0 start|stop|restart"

;;

esac

exit 0

chmod -R 777 /etc/init.d/nrped

8).启动服务

/etc/init.d/nrped start

service xinetd restart


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