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Nagios依赖PHP环境和perl环境，由于Nginx不支持Perl的CGI，需先来搭建Perl环境，Nagios原理介绍略。
文章原出处：https://blog.linuxeye.com/312.html
1、下载最新稳定源码包和Perl脚本
mkdir nagios-cacti
cd nagios-cacti
wget http://www.cpan.org/modules/by-module/FCGI/FCGI-0.74.tar.gz
wget http://www.cpan.org/authors/id/B/BO/BOBTFISH/FCGI-ProcManager-0.24.tar.gz
wget http://blog.linuxeye.com/wp-content/uploads/2013/04/perl-fcgi.pl
wget http://jaist.dl.sourceforge.net/project/nagios/nagios-3.x/nagios-3.5.0/nagios-3.5.0.tar.gz
wget http://nchc.dl.sourceforge.net/project/nagiosplug/nagiosplug/1.4.16/nagios-plugins-1.4.16.tar.gz
wget http://nchc.dl.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.14/nrpe-2.14.tar.gz
2、Nginx对Perl的CGI支持
Nginx支持Perl的CGI方法有好几种，基本原理都是通过Perl的FCGI模块实现，下面的方法就是其中一种：
安装FCGI模块
tar xzf FCGI-0.74.tar.gz
cd FCGI-0.74
perl Makefile.PL
make && make install
cd ../
安装FCGI-ProcManager模块
tar xzf FCGI-ProcManager-0.24.tar.gz
cd FCGI-ProcManager-0.24
perl Makefile.PL
make && make install
cd ../
Perl脚本
cp perl-fcgi.pl /usr/local/nginx
chmod +x /usr/local/nginx/perl-fcgi.pl
/usr/local/nginx/perl-fcgi.pl > /usr/local/nginx/logs/perl-fcgi.log 2>&1 & #启动Perl
chmod 777 /usr/local/nginx/logs/perl-fcgi.sock #Nginx Log中提示Permision Denied方法
cd ../
3、Nagios安装(服务端)
useradd -s /sbin/nologin nagios
groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd www
tar xzf nagios-3.5.0.tar.gz
cd nagios
yum -y install gd-devel
./configure --prefix=/usr/local/nagios --with-command-group=nagcmd
make all
make install #用于安装主要的程序、CGI及HTML文件
make install-init #用于生成init启动脚本
make install-config #用于安装示例配置文件
make install-commandmode #用于设置相应的目录权限
chkconfig --add nagios
chkconfig nagios on
cd ../
Nagios主程序只是提供一个运行框架，其具体监控是靠运行在其下的插件完成的，Nagios插件必须安装
tar xzf nagios-plugins-1.4.16.tar.gz
cd nagios-plugins-1.4.16
./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios
make && make install
cd ../
由于Nagios只能监测自己所在的主机的一些本地情况,例如，cpu负载、内存使用、硬盘使用等等。如果想要监测被监控的服务器上的这些本地情况，就要
用到NRPE。NRPE(Nagios Remote Plugin
Executor)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。NRPE可以称为
Nagios的Linux客户端。
tar xzf nrpe-2.14.tar.gz
cd nrpe-2.14
./configure
make && make install
cp sample-config/nrpe.cfg /usr/local/nagios/etc/
chown nagios.nagios /usr/local/nagios/etc/nrpe.cfg
cd ../
4、Nginx配置（服务端）
ln -s /usr/local/nagios/share /data/admin/nagios
以http://www.linuxeye.com/nagios，需要建立软链接，服务nginx.conf配置文件如下：
################http://www.linuxeye.com/nagios#########################
server {
listen 80;
server_name _;
access_log /dev/null;
root /data/admin;
index index.php;
location ~ .*\.(php|php5)?$ {
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fastcgi.conf;
}
location ~ .*\.(htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma)$ {
expires 30d;
}
location ~ .*\.(js|css)?$ {
expires 1h;
}
location /status {
stub_status on;
}
location ~ .*\.(cgi|pl)?$ {
auth_basic "Nagios Access";
auth_basic_user_file /usr/local/nagios/etc/htpasswd.users;
gzip off;
root /usr/local/nagios/sbin;
rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;
fastcgi_pass unix:/usr/local/nginx/logs/perl-fcgi.sock;
fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin$fastcgi_script_name;
fastcgi_index index.cgi;
fastcgi_param REMOTE_USER $remote_user;
fastcgi_param HTTP_ACCEPT_LANGUAGE en_US;
include fastcgi_params;
fastcgi_read_timeout 60;
}
}
以http://nagios.linuxeye.com服务nginx.conf配置文件如下：
################http://nagios.linuxeye.com##############################
server {
listen 80;
server_name nagios.linuxeye.com;
access_log logs/nagios_access.log combined;
auth_basic "Nagios Access";
auth_basic_user_file /usr/local/nagios/etc/htpasswd.users;
location / {
root /usr/local/nagios/share;
index index.html index.htm index.php;
}
location ~ .*\.(php|php5)?$ {
root /usr/local/nagios/share;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fastcgi.conf;
}
location /nagios {
alias /usr/local/nagios/share;
}
location /cgi-bin/images {
alias /usr/local/nagios/share/images;
}
location /cgi-bin/stylesheets {
alias /usr/local/nagios/share/stylesheets;
}
location /cgi-bin {
alias /usr/local/nagios/sbin;
}
location ~ .*\.(cgi|pl)?$ {
gzip off;
root /usr/local/nagios/sbin;
rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;
fastcgi_pass unix:/usr/local/nginx/logs/nginx-fcgi.sock;
fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin$fastcgi_script_name;
fastcgi_index index.cgi;
fastcgi_param REMOTE_USER $remote_user;
fastcgi_param HTTP_ACCEPT_LANGUAGE en_US