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首先Nginx需添加perl-fastcgi支持，请参考：https://www.haiyun.me/archives/nginx-perl-fastcgi.html
安装Nagios：

#https://www.haiyun.me
useradd nagios
groupadd nagcmd
usermod -G nagcmd nagios
usermod -G nagcmd www
cd /usr/local/src/
wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.4.1.tar.gz
tar zxvf nagios-3.4.1.tar.gz 
cd nagios
./configure --with-command-group=nagcmd --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios 
make all
make install
make install-init
make install-config
make install-commandmode
cd ../
wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.15.tar.gz
tar zxvf nagios-plugins-1.4.15.tar.gz
cd nagios-plugins
./configure --with-nagios-user=nagios --with-nagios-group=nagios --prefix=/usr/local/nagios
make
make install
ln -s  /usr/local/nagios/share/  /home/wwwroot/nagios.www.haiyun.me
/etc/init.d/nagios start

Nginx配置：

server
    {
        listen       80;
        server_name nagios.www.haiyun.me;
        root  /home/wwwroot/nagios.www.haiyun.me;
                index index.php;
 
                auth_basic "Login";
                auth_basic_user_file /home/wwwroot/nagios.www.haiyun.me/passwd;
                location ~ .*\.cgi?$
                {
                root /usr/local/nagios/sbin;
                rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;
                fastcgi_pass  unix:/tmp/perl-fastcgi.sock;
                fastcgi_index index.cgi;
                fastcgi_param   SCRIPT_FILENAME  $document_root$fastcgi_script_name;  
                include         fastcgi_params;  
                }
                location ~ .*\.(php|php5)?$
                        {
                                fastcgi_pass  unix:/tmp/php-cgi.sock;
                                fastcgi_index index.php;
                                include fcgi.conf;
                        }
                access_log none;
}

配置Nginx验证：

perl -e 'print crypt($ARGV[0], "pwdsalt")' passwd;echo
#生成passwd加密字符，将结果以user:passwd的方式填入/home/wwwroot/nagios.www.haiyun.me/passwd