Client端畢竟是重中之中，萬一出現異常掛了怎麼辦，這時候我們希望做成一個叢集

Ribbon 是一個客戶端負載均衡器   Feign本身集成了Rabbon 這裡只說 Ribbon

先將Client專案 複製一份，改下bootstrap.properties就行

spring.application.name=client
server.port=8882
spring.cloud.config.label=master
spring.cloud.config.profile=dev
spring.cloud.config.uri
 
=http://localhost:8782/

新建ribbon專案

application.properties

eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
server.port=8681
spring.application.name=ribbon

POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns
 
="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>tsearch_web</groupId>
    <artifactId>springtest-ribbon</
 
artifactId>
    <version>0.0.1</version>
    <packaging>jar</packaging>

    <name>springtest-ribbon</name>
    <description>Note Server catch</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.M3</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>


</project>

Application

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class SpringtestRibbonApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringtestRibbonApplication.class, args);
    }
}

Controller

@RestController
public class RibbonController {
@Autowired
RestTemplate restTemplate;

@RequestMapping(value = "/")
public String search() {
String str = restTemplate.getForObject("http://CLIENT", String.class);
return str;
}

@Bean
@LoadBalanced
RestTemplate restTemplate() {
return new RestTemplate();
}
}

訪問  http://localhost:8681/

 不斷重新整理 會預設切來切去

Router and Filter: Zuul

主要是做API 對映    比如api/user 對映到A伺服器的user.   api/shop對映到B伺服器的shop

 在Ribbon專案 的pom中加入zuul

        <dependency>
     <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>

Application加入

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
@EnableZuulProxy
public class SpringtestRibbonApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringtestRibbonApplication.class, args);
    }
}

 ZUUL 可以通過SERVICE_ID 或者URL 對映 這裡對映到了turbine-test的伺服器

eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
server.port=8681
spring.application.name=ribbon
zuul.routes.users.path=/turb/**
zuul.routes.users.serviceId=turbine-test

也可以直接換成URL

eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
server.port=8681
spring.application.name=ribbon
zuul.routes.users.path=/turb/**
zuul.routes.users.url=http://localhost:8783/