集群，负载均衡

集群构架图

https://blog.csdn.net/a821478424/article/details/50958721

nginx的负载均衡

https://blog.csdn.net/qq_35119422/article/details/81505732

集群架构及常见集群特性

https://blog.csdn.net/u011277123/article/details/78358781