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README
Apache-2.0

spring-cloud 全家桶示例

  • 一、Rest微服务构建案例工程模块

  • 1.微服务提供者module( case-provider-dept-8001 )

  • 2.微服务消费者module( case-consumer-dept-80 )

  • 二、Eureka服务注册与发现

  1. Eureka是Netflix的一个子模块,也是核心模块之一。Eureka是一个基于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。服务注册与发现对于微服务架构来说是非常重要的,有了服务发现与注册,只需要使用服务的标识符,就可以访问到服务,而不需要修改服务调用的配置文件了。功能类似于dubbo的注册中心,比如Zookeeper。

  2. Eureka遵守AP原则;CAP原则又称CAP定理,指的是在一个分布式系统中,Consistency(一致性)、 Availability(可用性)、Partition tolerance(分区容错性),三者不可兼得

  3. Eureka包含两个组件:Eureka Server和Eureka Client

  • Eureka Server提供服务注册服务 各个节点启动后,会在EurekaServer中进行注册,这样EurekaServer中的服务注册表中将会存储所有可用服务节点的信息,服务节点的信息可以在界面中直观的看到

  • EurekaClient是一个Java客户端,用于简化Eureka Server的交互,客户端同时也具备一个内置的、使用轮询(round-robin)负载算法的负载均衡器。在应用启动后,将会向Eureka Server发送心跳(默认周期为30秒)。如果Eureka Server在多个心跳周期内没有接收到某个节点的心跳,EurekaServer将会从服务注册表中把这个服务节点移除(默认90秒)

  1. 功能类似dubbo的zookeeper

Eureka 满足AP原则;Zookeeper 满足CP原则

img

  • 三、Ribbon负载均衡

客户端的负载均衡

  • 四、Feign负载均衡

声明式Web服务客户端,面向接口编程;自带ribbon负载算法

  • 五、Hystrix断路器

1、服务熔断:熔断机制是应对雪崩效应的一种微服务链路保护机制。 当扇出链路的某个微服务不可用或者响应时间太长时,会进行服务的降级,进而熔断该节点微服务的调用,快速返回"错误"的响应信息。当检测到该节点微服务调用响应正常后恢复调用链路。在SpringCloud框架里熔断机制通过Hystrix实现。Hystrix会监控微服务间调用的状况,当失败的调用到一定阈值,缺省是5秒内20次调用失败就会启动熔断机制。熔断机制的注解是@HystrixCommand

2、服务降级:整体资源快不够了,忍痛将某些服务先关掉,待渡过难关,再开启回来。 服务的降级是在客户端完成实现的,和服务端没有关系

3、服务监控hystrixDashboard

  • 六、Zuul路由网关

路由、过滤

  • 七、SpringCloud Config

服务端和客户端

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参照尚硅谷springcloud视频课程和脑图搭建项目,脑图(asserts) 展开 收起
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