参考资料：
Haproxy+keepalived 高可用负载: http://www.tuicool.com/articles/qY7Rz23
keepalived原理（主从配置+haproxy）及配置文件详解: http://blog.csdn.net/tantexian/article/details/50056229
haproxy+keepalived实现原理: http://blog.sina.com.cn/s/blog_5438aa780102w9ii.html
keepalived原理使用和配置: http://blog.chinaunix.net/uid-26575352-id-3529109.html
Haproxy+Keepalived主主高可用: http://fighter.blog.51cto.com/1318618/1254815/
Keepalived 工作原理及简要安装: http://www.open-open.com/lib/view/open1453698551808.html
Keepalived实现HAproxy高可用详解: http://www.linuxidc.com/Linux/2014-04/99460.htm
keepalived工作原理和配置说明: http://outofmemory.cn/wiki/keepalived-configuration
haproxy+keepalived实现高可用负载均衡: http://www.cnblogs.com/daixiang/p/5575477.html
Thrift+Haproxy负载均衡: http://blog.csdn.net/dengzhilong_cpp/article/details/51729918
轻量级分布式 RPC 框架 : http://blog.chinaunix.net/uid-261569-id-5690070.html
rpc框架之HA/负载均衡构架设计: http://www.cnblogs.com/yjmyzz/p/rpc-load-balance-design.html
Thrift做rpc服务器怎么进行负载均衡: https://www.oschina.net/question/249492_173951
浅显易懂的RPC平台框架（上篇）: http://www.tuicool.com/articles/QJrQJn
Grpc的一个简单的负载均衡类库: http://blog.csdn.net/starfd/article/details/52083363
(十一) Nepxion-Thunder分布式RPC集成框架 - 负载均衡和同步中心: http://nepxion.iteye.com/blog/2260172
LesenRPC基于netty/protobuffer的高性能RPC框架: http://www.it165.net/admin/html/201403/2584.html
Thrift做rpc服务器怎么进行负载均衡: https://zhidao.baidu.com/question/1959027318176532900.html