nagios实践

nagios安装环境介绍
Nagios-Server	10.0.0.21	Apache、Php、Nagios、nagios-plugins、nrpe
Nagios-Client 	10.0.0.22	nagios-plugins、nrpe

##nagios监控端部署
#1.在10.0.0.21上搭建lamp环境
yum -y install httpd php lrzsz openssl-devel gcc gcc-c++

#整合Apache和PHP
vim /etc/httpd/conf/httpd.conf
DirectoryIndex index.php index.html index.html.var
AddType application/x-httpd-php .php


#2.在10.0.0.21安装nagios-server服务端
安装所需包组件
nagios-4.3.1.tar.gz
nagios-plugins-1.5.tar.gz
nrpe-2.12.tar.gz


#创建nagios用户组和用户
groupadd nagios
useradd -g nagios nagios

#编译安装nagios
wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.3.1.tar.gz
tar -zxvf nagios-4.3.1.tar.gz
cd nagios-4.3.1
./configure --prefix=/usr/local/nagios
make all
make install
make install-init
make install-commandmode	
make install-webconf
make install-config

#生成Nagios网页认证文件并创建用户
htpasswd  -c  /usr/local/nagios/etc/htpasswd.users   nagiosadmin

#添加nagios到开机自启
chkconfig --add nagios
chkconfig --level 35 nagios on
chkconfig --list nagios

#检查配置文件
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
或
/etc/init.d/nagios configtest

#启动httpd和nagios
/etc/init.d/httpd restart
/etc/init.d/nagios restart

#查看进程
ps -ef|grep nagios
ps -ef|grep httpd

#3.在10.0.0.21上安装nagios-plugins
wget https://nagios-plugins.org/download/nagios-plugins-2.1.4.tar.gz
tar -zxvf nagios-plugins-2.1.4.tar.gz
cd nagios-plugins-2.1.4
./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios
make
make install
#注意：如果要监控mysql 需要添加 --with-mysql


#4.在10.0.0.21上安装nrpe
yum -y install gcc gcc-c++ openssl-devel xinetd
wget http://prdownloads.sourceforge.net/sourceforge/nagios/nrpe-2.15.tar.gz
tar -zxvf nrpe-2.15.tar.gz
cd nrpe-2.15
./configure --prefix=/usr/local/nagios
make all
make install-plugin
make install-daemon
make install-daemon-config
make install-xinetd

配置NRPE
vim /usr/local/nagios/etc/nrpe.cfg
allowed_hosts=127.0.0.1,10.0.0.21

vim /etc/xinetd.d/nrpe
only_from       = 127.0.0.1 10.0.0.21

#配置/etc/services
vim +429 /etc/services
nrpe            5666/tcp
nrpe            5666/udp


#启动NRPE
/etc/init.d/xinetd restart

#启动httpd和nagios
/etc/init.d/httpd restart
/etc/init.d/nagios restart

#测试nrpe效果
/usr/local/nagios/libexec/check_nrpe -H 10.0.0.21 -c check_load


#5.浏览器访问
http://10.0.0.21/nagios/



##nagios被监控端部署(10.0.0.22)
#监控另一台linux服务器
(1)添加nagios用户
useradd -s /sbin/nologin nagios
mkdir /usr/local/nagios
chown -R nagios.nagios /usr/local/nagios

(2)安装nagios-plugins
wget https://nagios-plugins.org/download/nagios-plugins-2.1.4.tar.gz
tar -zxvf nagios-plugins-2.1.4.tar.gz
cd nagios-plugins-2.1.4
./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios
make
make install

(3)安装NRPE
yum -y install gcc gcc-c++ openssl-devel xinetd
wget http://prdownloads.sourceforge.net/sourceforge/nagios/nrpe-2.15.tar.gz
tar -zxvf nrpe-2.15.tar.gz
cd nrpe-2.15
./configure --prefix=/usr/local/nagios
make all
make install-plugin
make install-daemon
make install-daemon-config
make install-xinetd

配置NRPE
vim /usr/local/nagios/etc/nrpe.cfg
allowed_hosts=10.0.0.21

vim /etc/xinetd.d/nrpe
only_from       = 10.0.0.21

#配置/etc/services
vim +429 /etc/services
nrpe            5666/tcp
nrpe            5666/udp

#启动NRPE
/etc/init.d/xinetd restart



##在Nagios监控端10.0.0.21上添加一台被监控的主机
(1)新增一个配置文件linux.cfg
vim /usr/local/nagios/etc/nagios.cfg
增加
cfg_file=/usr/local/nagios/etc/objects/linux.cfg


(2)编辑新加主机的配置文件
vim /usr/local/nagios/etc/objects/linux.cfg

define host{
        use                     linux-server
        host_name               c6s02
        alias                   c6s02
        address                 10.0.0.22
        }

#修改属主属组
chown -R nagios.nagios /usr/local/nagios/etc/objects/linux.cfg	
		
(3)检查语法并重启
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
或者
/etc/init.d/nagios configtest
/etc/init.d/nagios restart