Nginx负载均衡简易方法

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http配置内部，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。