nginx搭建nagios监控环境

一.安装nagios这里不做说明
1.nagios map显示出不来，要装GD 和GD-DEV* 然后再重新编译nagios，要么就一开始就装好。

二.nginx部分
1.安装
2.配置部分，nginx不能执行外部程序，所以我们要用fastcgi协议来调用外部程序。
Nginx并不提供支持对外部程序的直接调用或者解析（所以缺少像apache里的mod_php这样的模块），所有的外部程序（包括PHP）必须通过fastcgi接口来调用，在Linux下接口是socket （文件socket或者Internet socket）。所以为了调用CGI程序，我们需要一个fastcgi的wrapper，这个wrapper绑定在某个固定socket上（比如端口或者文件socket），当nginx将CGI请求发送给这个socket的时候，wrapper接纳请求并fork一个新的线程，这个线程调用外部的程序或者解释器处理脚本并读取返回值，而wrapper再将返回的数据（网页或者图片等）通过fastcgi将数据通过那个固定的socket传递给nginx
目前有网上流行的两种fastcgi管理器，perl-cgi和spwan-cgi,用spwan-cgi启动php部分
例：spwan-cgi -a 127.0.0.1 -p 9000 -f /usr/local/php-cgi -C 20
这里我们也可以用-s 参数来启用sock通信，例：unix:/var/run/nginx.sock
命令用法可以用--help来查看，然后再nginx.conf写入

复制代码代码如下:

	location ~ \.php$ {

	          root           /usr/local/nagios/share/;

	          fastcgi_pass    127.0.0.1:9000;

	          # fastcgi_pass unix:/var/run/nagios.sock;

	          fastcgi_index  index.php;

	          fastcgi_param  SCRIPT_FILENAME /usr/local/nagios/share/$fastcgi_script_name;

	          include        fastcgi_params;

	        }

把所有php结尾的访问交给php来处理。
下面是perl-cgi的内容，它也是根据fastcgi协议写的

复制代码代码如下:

	#!/usr/bin/perl

	use FCGI;

	#perl -MCPAN -e 'install FCGI'

	use Socket;

	#this keeps the program alive or something after exec'ing perl scripts

	END() { } BEGIN() { }

	*CORE::GLOBAL::exit = sub { die "fakeexit\nrc=".shift()."\n"; }; eval q{exit}; if ($@) { exit unless $@ =~ /^fakeexit/; } ;

	&main;

	sub main {

	    #$socket = FCGI::OpenSocket( ":3461", 10 ); #use IP sockets

	    $socket = FCGI::OpenSocket( "/var/run/nagios.sock", 10 ); #use UNIX sockets - user running this script must have w access to the 'nginx' folder!!

	    $request = FCGI::Request( \*STDIN, \*STDOUT, \*STDERR, \%ENV, $socket );

	    if ($request) {request_loop()};

	               FCGI::CloseSocket( $socket );

	}

	sub request_loop {

	                while( $request->Accept() >= 0 ) {

	                   #processing any STDIN input from WebServer (for CGI-GET actions)

	                   $env = $request->GetEnvironment();

	                   $stdin_passthrough ='';

	                   $req_len = 0 + $ENV{CONTENT_LENGTH};

	                   if ($ENV{REQUEST_METHOD} eq 'GET'){

	                                $stdin_passthrough .= $ENV{'QUERY_STRING'};

	                        }

	                        #running the cgi app

	                        if ( (-x $ENV{SCRIPT_FILENAME}) && #can I execute this?

	                                 (-s $ENV{SCRIPT_FILENAME}) && #Is this file empty?

	                                 (-r $ENV{SCRIPT_FILENAME})     #can I read this file?

	                        ){

	                                #http://perldoc.perl.org/perlipc.html#Safe-Pipe-Opens

	                open $cgi_app, '-|', $ENV{SCRIPT_FILENAME}, $stdin_passthrough or print("Content-type: text/plain\r\n\r\n"); print "Error: CGI app returned no output - Executing $ENV{SCRIPT_FILENAME} failed !\n";

	                                if ($cgi_app) {print <$cgi_app>; close $cgi_app;}

	                        }

	                        else {

	                                print("Content-type: text/plain\r\n\r\n");

	                                print "Error: No such CGI app - $req_len - $ENV{CONTENT_LENGTH} - $ENV{REQUEST_METHOD} - $ENV{SCRIPT_FILENAME} may not exist or is not executable by this process.\n";

	                        }

	                }

	}

用一个脚本启动

复制代码代码如下:

	#!/bin/bash

	## start_nginx_cgi.sh: start nginx cgi mode

	## ljzhou, 2007.08.20

	PERL="/usr/bin/perl"

	NGINX_CGI_FILE="/usr/local/nagios/bin/perl-cgi.pl"

	#bg_num=`jobs -l |grep "NGINX_CGI_FILE"`

	#PID=`ps aux|grep "perl-cgi"|cut -c10-14|xargs kill -9`

	PID=`ps aux|grep 'perl-cgi'|cut -c10-14|sed -n "1P"`

	echo $PID

	sockfiles="/var/run/nagios.sock"

	kill -9 $PID

	$PERL $NGINX_CGI_FILE &

	sleep 3

	`chown nobody.nobody $sockfiles`

然后再加如下配置到nginx

复制代码代码如下:

	location ~ \.cgi$ {

	     rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;

	     fastcgi_pass unix:/var/run/nagios.sock;

	     fastcgi_index index.cgi;

	     fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin$fastcgi_script_name;

	     fastcgi_param HTTP_ACCEPT_LANGUAGE en_US;

	     include fastcgi_params;

	  }

	     location ~ \.pl$ {

	     fastcgi_pass  unix:/var/run/nagios.sock;

	     fastcgi_index index.pl;

	     fastcgi_param SCRIPT_FILENAME  /usr/local/nagios/sbin$fastcgi_script_name;

	     include       fastcgi_params;

	  }

(责任编辑：IT)

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