Nginx+keepalived 高可用双机热备（主从模式/双主模式）
https://blog.csdn.net/u012599988/article/details/82152224?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.no_search_link&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.no_search_link
群集架构篇——nginx反向代理+keepalived双机热备+tomcat服务器池+后端数据库
https://blog.51cto.com/u_13871362/2321590
keepalived配置虚拟ip（vip）实现双机热备以及自动切换主备
https://blog.csdn.net/dap769815768/article/details/87010773