作用：实现服务治理（服务注册与发现）
简介：Spring Cloud Eureka是Spring Cloud Netflix项目下的服务治理模块。
组成：Eureka Server（注册中心）
Eureka Client （服务注册）
Eureka服务端用作服务注册中心，支持集群的部署。 Eureka客户端是一个java客户端，用来处理服务注册与发现。
在应用启动时，Eureka客户端向服务端注册自己的服务信息，同时将服务端的服务信息缓存到本地。客户端会和服务端周期性的进行心跳交互，以更新服务租约和服务信息。
GitHub Netflix/eureka
https://github.com/Netflix/eureka
云端服务发现，一个基于 REST 的服务，用于定位服务，以实现云端中间层服务发现和故障转移。
Eureka is a REST (Representational State Transfer) based service that is primarily used in the AWS cloud for locating services for the purpose of load balancing and failover of middle-tier servers.
At Netflix, Eureka is used for the following purposes apart from playing a critical part in mid-tier load balancing.
For aiding Netflix Asgard - an open source service which makes cloud deployments easier, in
Fast rollback of versions in case of problems avoiding the re-launch of 100's of instances which could take a long time.
In rolling pushes, for avoiding propagation of a new version to all instances in case of problems.
For our cassandra deployments to take instances out of traffic for maintenance.
For our memcached caching services to identify the list of nodes in the ring.
For carrying other additional application specific metadata about services for various other reasons.
来源：博客园
作者：钟楼怪人-aLei
链接：https://www.cnblogs.com/yezixun666/p/11484478.html