consul是一个可以提供服务发现，健康检查，多数据中心，Key/Value存储等功能的分布式服务框架，用于实现分布式系统的服务发现与配置。与其他分布式服务注册与发现的方案，使用起来也较为简单。Consul用Golang实现，因此具有天然可移植性(支持Linux、Windows和Mac OS X)；安装包仅包含一个可执行文件，方便部署。
官网：https://github.com/Netflix/eureka/wiki
Eureka是Netflix开发的服务发现框架，本身是一个基于REST的服务。SpringCloud将它集成在其子项目spring-cloud-netflix中，以实现SpringCloud的服务注册和发现功能。
Eureka包含两个组件：Eureka Server和Eureka Client。
所谓服务注册中心就是在整个的微服务架构中单独提出一个服务，这个服务不完成系统的任何的业务功能，仅仅用来完成对整个微服务系统的服务注册和服务发现，以及对服务健康状态的监控和管理功能。
Spring Cloud provides tools for developers to quickly build some of the common patterns in distributed systems (e.g. configuration management, service discovery, circuit breakers, intelligent routing, micro-proxy, control bus). Coordination of distributed systems leads to boiler plate patterns, and using Spring Cloud developers can quickly stand up services and applications that implement those patterns. ——-[摘自官网]
In short, the microservice architectural style is an approach to developing a single application as a suite of small services(一系列微小服务), each running in its own process(运行在自己的进程里) and communicating with lightweight mechanisms, often an HTTP resource API. These services are built around business capabilities(围绕自己的业务开发) and independently deployable(独立部署) by fully automated deployment machinery. There is a bare minimum of centralized management of these services(基于分布式管理), which may be written in different programming languages and use different data storage technologies. —–[摘自官网]