做个简单的测试，一个Nginx, 通过FastCGI协议和另外两台服务器上的基于CppCMS开发的web server通信。配置方法很简单：

首先，必须在nginx.conf文件开头，server 配置之前添加下面的upstream信息：

upstream backend {

    server 192.168.1.55:8080;

    server 192.168.1.58:8080;

}

然后在某个server配置里面，包含了fastcgi的配置文件：

    include ./conf.d/fastcgi.test;

在这个fastcgi.test中，沿用CppCMS需要的fastcgi大多数配置, 除了将fastcgi_pass后面的IP:port 改成前面设置的backend.

location ~ ^/my_site_path.*$ {

    fastcgi_pass backend;

    fastcgi_split_path_info ^(/my_site)(.*)$;

    fastcgi_param SCRIPT_FILENAME  $fastcgi_script_name;

    fastcgi_param PATH_INFO        $fastcgi_path_info;

    fastcgi_param  SCRIPT_NAME     /my_site;

    fastcgi_param  QUERY_STRING    $query_string;

    fastcgi_param  REQUEST_METHOD  $request_method;

    fastcgi_param  CONTENT_TYPE    $content_type;

    fastcgi_param  CONTENT_LENGTH  $content_length;

    fastcgi_param  REQUEST_URI     $request_uri;

    fastcgi_param  DOCUMENT_URI    $document_uri;

    fastcgi_param  DOCUMENT_ROOT   $document_root;

    fastcgi_param  SERVER_PROTOCOL $server_protocol;

    fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;

    fastcgi_param  SERVER_SOFTWARE    nginx;

    fastcgi_param  REMOTE_ADDR        $remote_addr;

    fastcgi_param  REMOTE_PORT        $remote_port;

    fastcgi_param  SERVER_ADDR        $server_addr;

    fastcgi_param  SERVER_PORT        $server_port;

    fastcgi_param  SERVER_NAME        $server_name;

}

现在测试一下，关闭一台web server，网页依然能够正常浏览。