一、参考Tengine(http://tengine.taobao.org/document_cn/http_dyups_cn.html)
This module can be used to update your upstream-list without reloadding Nginx.
TODO:
It can not work with common `nginx_upstream_check_module`.
The module is not compiled into Tengine by default. It can be enabled with ‘--with-http_dyups_module‘
configuration parameter, and enabled lua support with ‘--with-http_dyups_lua_api‘.
But it can not be compiled as a ‘.so‘.
006_nginx动态upstream-ngx_http_dyups_module模块
原文：http://www.cnblogs.com/itcomputer/p/7375193.html