Eureka

Eureka简介

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.