nagios安装简介
nagios本身并没有监控的功能，所有的监控是由插件完成的，插件将监控的结果返回给nagios，nagios分析这些结果以web的方式展现给我们，同时提供相应的报警功能(这个报警的功能也是由插件完成的)。
nagios core 完成核心功能比如调用插件执行任务
nagios plugins 完成具体的某个任务比如检查远程主机是否存活
apache,php 前端页面展示和cgi脚本执行
nrpe 远程插件执行，监控远程linux主机需要安装
系统及环境
centos==7.3.1611 (Core)
nagios==4.3.2
nagios-plugins==2.2.1
nrpe==2.12
apr==1.4.5
apr-util==1.3.12
pcre==8.33
httpd==2.4.28
php==5.6.25
用户创建
/usr/sbin/groupadd nagios
/usr/sbin/groupadd nagcmd
/usr/sbin/groupadd apache
/usr/sbin/useradd nagios -g nagios -s /sbin/nologin
/usr/sbin/useradd apache -g apache -s /sbin/nologin
/usr/sbin/usermod -a -G nagcmd nagios
/usr/sbin/usermod -a -G nagcmd apache
安装系统依赖
yum remove -y apr-util-devel apr apr-util-mysql \
apr-docs apr-devel apr-util \
apr-util-docs
yum install gcc glibc glibc-common gcc-c++ \
gd gd-devel openssl openssl-devel \
unzip bzip2 libxml2 libxml2-devel
编译安装apache,php
#安装apr
wget http://archive.apache.org/dist/apr/apr-1.4.5.tar.gz
tar -xf apr-1.4.5.tar.gz
cd apr-1.4.5
./configure --prefix=/usr/local/apr
make && make install
#安装apr-util
wget http://archive.apache.org/dist/apr/apr-util-1.3.12.tar.gz
tar -xf apr-util-1.3.12.tar.gz
cd apr-util-1.3.12
./configure --prefix=/usr/local/apr-util \
--with-apr=/usr/local/apr/bin/apr-1-config
make && make install
#安装pcre
wget http://jaist.dl.sourceforge.net/project/pcre/pcre/8.33/pcre-8.33.tar.gz
tar -xf pcre-8.33.tar.gz
cd pcre-8.33
./configure --prefix=/usr/local/pcre
make && make install
#安装httpd
wget http://mirror.bit.edu.cn/apache//httpd/httpd-2.4.28.tar.gz
tar -xf httpd-2.4.28.tar.gz
cd httpd-2.4.28
./configure --prefix=/usr/local/apache2 \
--with-apr=/usr/local/apr \
--with-apr-util=/usr/local/apr-util \
--with-pcre=/usr/local/pcre
make && make install
#安装php
wget http://cn2.php.net/distributions/php-5.6.25.tar.gz
tar -xf php-5.6.25.tar.gz
cd php-5.6.25
./configure --prefix=/usr/local/php \
--with-apxs2=/usr/local/apache2/bin/apxs
make && make install
编译安装nagios
#安装nagios core
tar -xf nagios-4.3.2.tar.gz
cd nagios-4.3.2
./configure --with-command-group=nagcmd
make all
make install
make install-init
make install-config
make install-commandmode
#添加apache nagios配置
cp sample-config/httpd.conf /usr/local/apache2/conf/extra/httpd-nagios.conf
#添加web界面管理用户
/usr/local/apache2/bin/htpasswd -bc /usr/local/nagios/etc/htpasswd.users nagiosadmin admin
#设置开机自启动
chkconfig --add nagios
chkconfig nagios on
###################################
#安装nagios-plugin
tar -xf nagios-plugins-2.2.1.tar.gz
cd nagios-plugins-2.2.1
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make && make install
###################################
#安装nrpe
tar -xvf nrpe-2.12.tar.gz
cd nrpe-2.12
./configure
make all
make install-plugin
配置apache和nagios
#!/bin/bash
conf=/usr/local/apache2/conf/httpd.conf
#1开启apache cgi模块,解决点击页面下载cgi情况
sed -i "s+^#LoadModule cgid_module+LoadModule cgid_module+g" $conf
#2.开启apache php模块,解决403禁止访问问题
sed -i "s/DirectoryIndex index.html/& index.php/g" $conf
sed -i "/application\/x-gzip/aAddType application\/x-httpd-php .php" $conf
#3.添加apache nagios配置文件
echo "Include conf/extra/httpd-nagios.conf" >> $conf
#4.设置apache 运行用户和组为apache"
sed -i "s/^User.*$/User apache/g" $conf
sed -i "s/^Group.*$/Group apache/g" $conf
启动nagios apache
service nagios start
/usr/local/apache2/bin/apachectl start
至此nagios的基本安装已经完成，登录浏览器访问ip/nagios即可。