高可用eureka服务注册与发现代码例子

代码

Eureka server 1

pom.xml

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

application.yml

server:
  port: 8761
eureka:
  instance:
    hostname: 192.168.31.168
#    hostname: localhost
  client:
    register-with-eureka: false
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:8762/eureka/

spring:
  application:
    name: eureka-server1

EurekaServer1Application

@SpringBootApplication
@EnableEurekaServer
public class EurekaServer1Application {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServer1Application.class, args);
    }
}

Eureka server 2

pom.xml

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

application.yml

server:
  port: 8762
eureka:
  instance:
    hostname: 192.168.31.168
  client:
    register-with-eureka: false
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:8761/eureka/


spring:
  application:
    name: eureka-server2
  cloud:
    compatibility-verifier:
      enabled: false

EurekaServer2Application

@SpringBootApplication
@EnableEurekaServer
public class EurekaServer2Application {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServer2Application.class, args);
    }
}

Eureka client

pom.xml

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

application.yml

spring:
  application:
    name: eureka-client
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/

EurekaClientApplication

@SpringBootApplication
@EnableDiscoveryClient
public class EurekaClientApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaClientApplication.class, args);
    }
}

依次运行Eureka server1 , Eureka server2, EurekaClient

你会发现两个server上都有了EurekaClient的注册信息。

Eureka server1 

Eureka server2

相关问题与总结

1. Eureka server 不能用localhost,否则不会复制注册信息到peer Eureka上。

相关代码PeerAwareInstanceRegistryImpl，ApplicationResource.addInstance(), PeerEurekaNodes.resolvePeerUrls()