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Add lesson 6
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‎spring-cloud/lesson-6/README.md

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# Spring Cloud 负载均衡
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## Netflix Ribbon
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### 引入Maven 依赖
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```xml
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-ribbon</artifactId>
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</dependency>
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```
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### 激活 Ribbon 客户端
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```java
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package com.segumentfault.springcloudlesson6;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.netflix.ribbon.RibbonClient;
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import org.springframework.cloud.netflix.ribbon.RibbonClients;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.web.client.RestTemplate;
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@SpringBootApplication
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// 多个 Ribbon 定义
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@RibbonClients({
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@RibbonClient(name = "spring-cloud-service-provider")
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})
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public class SpringCloudLesson6Application {
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public static void main(String[] args) {
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SpringApplication.run(SpringCloudLesson6Application.class, args);
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}
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//声明 RestTemplate
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@Bean
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public RestTemplate restTemplate(){
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return new RestTemplate();
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}
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}
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```
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### 配置 Ribbon 客户端
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application.properties
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```properties
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### 配置ribbon 服务地提供方
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spring-cloud-service-provider.ribbon.listOfServers = \
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http://${serivce-provider.host}:${serivce-provider.port}
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```
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### 调整 RestTemplate
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```java
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//声明 RestTemplate
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@LoadBalanced // RestTemplate 的行为变化
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@Bean
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public RestTemplate restTemplate(){
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return new RestTemplate();
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}
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```
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## Neflix Ribbon 整合 Eureka
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### 激活服务发现的客户端
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```java
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package com.segumentfault.springcloudlesson6;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
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import org.springframework.cloud.client.loadbalancer.LoadBalanced;
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import org.springframework.cloud.netflix.ribbon.RibbonClient;
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import org.springframework.cloud.netflix.ribbon.RibbonClients;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.web.client.RestTemplate;
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@SpringBootApplication
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// 多个 Ribbon 定义
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@RibbonClients({
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@RibbonClient(name = "spring-cloud-service-provider")
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})
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@EnableDiscoveryClient // 激活服务发现客户端
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public class SpringCloudLesson6Application {
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public static void main(String[] args) {
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SpringApplication.run(SpringCloudLesson6Application.class, args);
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}
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//声明 RestTemplate
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@LoadBalanced // RestTemplate 的行为变化
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@Bean
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public RestTemplate restTemplate(){
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return new RestTemplate();
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}
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}
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```
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### 创建并且启动 Eureka Server
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以`spring-cloud-lesson6-eureka-server` 为例
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#### 激活 Eureka Server
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```java
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package com.segumentfault.springcloudlesson6eurekaserver;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
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@SpringBootApplication
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@EnableEurekaServer
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public class SpringCloudLesson6EurekaServerApplication {
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public static void main(String[] args) {
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SpringApplication.run(SpringCloudLesson6EurekaServerApplication.class, args);
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}
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}
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```
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#### 配置 Eureka 服务器
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```properties
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## Eureka Serer
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spring.application.name = spring-cloud-eureka-server
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## 服务端口
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server.port = 10000
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## Spring Cloud Eureka 服务器作为注册中心
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## 通常情况下，不需要再注册到其他注册中心去
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## 同时，它也不需要获取客户端信息
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### 取消向注册中心注册
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eureka.client.register-with-eureka = false
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### 取消向注册中心获取注册信息（服务、实例信息）
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eureka.client.fetch-registry = false
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## 解决 Peer / 集群 连接问题
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eureka.instance.hostname = localhost
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eureka.client.serviceUrl.defaultZone = http://${eureka.instance.hostname}:${server.port}/eureka
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```
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#### 启动 Eureka Server
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### 调整 Ribbon 客户端连接 Eureka Server
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`applicaiont.properties`
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```properties
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## 服务提供方
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spring.application.name = spring-cloud-ribbon-client
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### 服务端口
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server.port = 8080
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### 管理安全失效
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management.security.enabled = false
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### 暂时性关闭 Eureka 注册
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## 当使用 Eureka 服务发现时，请注释掉一下配置
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# eureka.client.enabled = false
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## 连接 Eureka Sever
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eureka.client.serviceUrl.defaultZone = http://localhost:10000/eureka/
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### 服务提供方主机
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serivce-provider.host = localhost
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### 服务提供方端口
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serivce-provider.port = 9090
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serivce-provider.name = spring-cloud-service-provider
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### 配置ribbon 服务地提供方
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## 当使用 Eureka 服务发现时，请注释掉一下配置
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# spring-cloud-service-provider.ribbon.listOfServers = \
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http://${serivce-provider.host}:${serivce-provider.port}
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```
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#### 调整服务提供方并且连接 Eureka Server
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```properties
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## 服务提供方
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spring.application.name = spring-cloud-service-provider
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### 服务端口
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server.port = 9090
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### 管理安全失效
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management.security.enabled = false
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### 暂时性关闭 Eureka 注册
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## 当使用 Eureka 服务发现时，请注释掉一下配置
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# eureka.client.enabled = false
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## 连接 Eureka Sever
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eureka.client.serviceUrl.defaultZone = http://localhost:10000/eureka/
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```
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再启动两台服务提供方实例
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--server.port=9091
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--server.port=9092
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实际请求客户端
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* LoadBalancerClient
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* RibbonLoadBalancerClient
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负载均衡上下文
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* LoadBalancerContext
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* RibbonLoadBalancerContext
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负载均衡器
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* ILoadBalancer
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* BaseLoadBalancer
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* DynamicServerListLoadBalancer
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* ZoneAwareLoadBalancer
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* NoOpLoadBalancer
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负载均衡规则
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核心规则接口
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* IRule
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* 随机规则：RandomRule
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* 最可用规则：BestAvailableRule
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* 轮训规则：RoundRobinRule
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* 重试实现：RetryRule
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* 客户端配置：ClientConfigEnabledRoundRobinRule
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* 可用性过滤规则：AvailabilityFilteringRule
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* RT权重规则：WeightedResponseTimeRule
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* 规避区域规则：ZoneAvoidanceRule
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PING 策略
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核心策略接口
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* IPingStrategy
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PING 接口
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* IPing
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* NoOpPing
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* DummyPing
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* PingConstant
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* PingUrl
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Discovery Client 实现
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* NIWSDiscoveryPing

‎spring-cloud/lesson-6/[课件] Spring Cloud 负载均衡.pdf

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‎spring-cloud/lesson-6/spring-cloud-lesson-6-eureka-server/.gitignore

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target/
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!.mvn/wrapper/maven-wrapper.jar
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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nbproject/private/
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build/
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nbbuild/
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dist/
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nbdist/
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.nb-gradle/

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