集群

Redis Cluster搭建部署详解 :  https://suyu.net/post/103.html;

Nginx+keepalived  高可用集群 : https://www.cnblogs.com/wenxuehai/p/15013654.html; 

  keepalived 介绍: https://zhuanlan.zhihu.com/p/43971218

netty搭建websocket : https://www.jianshu.com/p/56216d1052d7 ;    https://www.cnblogs.com/vettel0329/p/12221268.html