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1. Spring Cloud 把各个组件相互配合起来，整合成一套成熟的微服务架构体系其中，
2. 由Eureka做服务注册与发现，很好的把各个服务链接起来
3. Ribbon+Feign提供了微服务的调用和负载均衡解决方案
4. Hystrix负责监控微服务之间的调用情况，以及降级和熔断保护
5. Hystrix dashboard监控Hystrix的熔断情况以及监控信息以图形化界面展示
6. Spring Cloud Config 提供了统一的配置中心服务
7. 所有外来的请求由Zuul统一进行路由和转发，起到了API网关的作用
8. Sleuth与Zipkin把我们微服务的追踪数据记录下来并展示方便我们进行后续分析

​ 在云计算中，应用程序并不总是知道其他服务的确切位置。服务注册中心(如Netflix Eureka)或sidecar解决方案(如HashiCorp)可以提供帮助。Spring Cloud为流行的注册中心(如Eureka、、Zookeeper甚至Kubernetes的内置系统)提供了DiscoveryClient实现。还有一个Spring云负载均衡器，可以帮助您在服务实例之间小心地分配负载。

​ In the cloud, applications can’t always know the exact location of other services. A service registry, such as Netflix Eureka, or a sidecar solution, such as HashiCorp Consul, can help. Spring Cloud provides DiscoveryClient implementations for popular registries such as Eureka, Consul, Zookeeper, and even Kubernetes' built-in system. There’s also a Spring Cloud Load Balancer to help you distribute the load carefully among your service instances.

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​ 有这么多的客户端和服务器，在云架构中包含一个API网关通常是有帮助的。网关可以负责保护和路由消息、隐藏服务、调整负载和许多其他有用的事情。Spring Cloud Gateway为您提供了对API层的精确控制，集成了Spring云服务发现和客户端负载平衡解决方案，从而简化了配置和维护。

​ With so many clients and servers in play, it’s often helpful to include an API gateway in your cloud architecture. A gateway can take care of securing and routing messages, hiding services, throttling load, and many other useful things. Spring Cloud Gateway gives you precise control of your API layer, integrating Spring Cloud service discovery and client-side load-balancing solutions to simplify configuration and maintenance.

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​ 在云计算中，配置不能简单地嵌入到应用程序中。配置必须足够灵活，以处理多个应用程序、环境和服务实例，并在不停机的情况下处理动态更改。Spring Cloud Config旨在减轻这些负担，并提供与版本控制系统(如Git)的集成，以帮助您保持配置的安全性。

​ In the cloud, configuration can’t simply be embedded inside the application. The configuration has to be flexible enough to cope with multiple applications, environments, and service instances, as well as deal with dynamic changes without downtime. Spring Cloud Config is designed to ease these burdens and offers integration with version control systems like Git to help you keep your configuration safe.

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​ Resilience4J, Sentinel, or Hystrix

​ 分布式系统可能不可靠。请求可能会遇到超时或完全失败。一个断路器可以帮助缓解这些问题，Spring Cloud断路器为您提供了三种流行的选择:Resilience4J、Sentinel或Hystrix。

​ Distributed systems can be unreliable. Requests might encounter timeouts or fail completely. A circuit breaker can help mitigate these issues, and Spring Cloud Circuit Breaker gives you the choice of three popular options: Resilience4J, Sentinel, or Hystrix.

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​ 调试分布式应用程序可能很复杂，需要很长时间。对于任何给定的故障，您可能需要将来自几个独立服务的信息跟踪拼凑在一起。Spring Cloud Sleuth可以以一种可预测和可重复的方式来检测您的应用程序。当与Zipkin一起使用时，您可以将注意力集中在任何可能出现的延迟问题上。

​ Debugging distributed applications can be complex and take a long time. For any given failure, you might need to piece together traces of information from several independent services. Spring Cloud Sleuth can instrument your applications in a predictable and repeatable way. And when used in conjunction with Zipkin, you can zero in on any latency problems you might have.

​ 在云计算中，拥有一个可靠的、值得信赖的、稳定的api，您可以获得额外的分数——但是实现它可能是一段旅程。基于契约的测试是高绩效团队经常使用的一种技术，以保持在正轨上。它有助于形式化api的内容，并围绕这些内容构建测试，以确保代码处于检查状态。

​ Spring Cloud Contract使用Groovy、Java或Kotlin编写的契约，为REST和基于消息的api提供基于契约的测试支持。

​ In the cloud, you get extra points for having reliable, trustworthy, stable APIs—but getting there can be a journey. Contract-based testing is one technique that high-performing teams often use to stay on track. It helps by formalizing the content of APIs and building tests around them to ensure code remains in check.

​ Spring Cloud Contract provides contract-based testing support for REST and messaging-based APIs with contracts written in Groovy, Java, or Kotlin.

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