http {
    ...
    ...

    lua_shared_dict statics_dict    1M; # 初始化变量
    lua_package_path "/etc/nginx/ng大带宽服务器x_reqstatus_lua/?.lua";  #路径

    server {
        listen 80;
        server_name  justforfun.com;

        # 在需要监控的 server_name 添加此句
        log_by_lua_file "/etc/nginx/ngx_reqstatus_lua/hook.lua";
        location /{
            ...
            ...
        }
    }
    # 监控服务
    server {
        listen 127.0.0.1:6080;
        location /{
            access_by_lua_file "/etc/nginx/ngx_reqstatus_lua/status.lua";
        }
    }
}

有 sample 嘛

首先你要安装好 nginx lua [参考]( http://zheng-ji.info/blog/2015/10/29/gei-tengine-jia-shang-lua-tuo-zhan/)
之后按照上述配置 nginx.conf 就好了