Spring cloud Eureka服务器没有相互复制，显示警告

Question

server:
  port: ${server.instance.port:5678}
spring:
  application:
    name: nodeservice

sidecar:
  port: ${nodeserver.instance.port:3000}
  health-uri: http://localhost:${nodeserver.instance.port:3000}/health.json

eureka:
  instance:
    hostname: ${nodeserver.instance.name:localhost}
    preferIpAddress: ${preferipaddress:false}
    leaseRenewalIntervalInSeconds: 5 #default is 30, recommended to keep default
    metadataMap:
      instanceId: ${spring.application.name}:${spring.application.instance_id:${random.value}}
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/

知道为什么吗？

Answer 1

Eureka：只注册第一个成功的URL。在您的示例中，第一个成功的url是http://localhost:8761/eureka/，因此不能继续注册下一个url http://localhost:8762/eureka/。

您可以通过以下方法重写：

application.yml

 eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
      additionalZones: http://localhost:8762/eureka

@SpringBootApplication
@EnableEurekaClient
public class Application implements ApplicationContextAware {


    @Value("${eureka.client.serviceUrl.additionalZones:}")
    String additionalZones;

    ConfigurableApplicationContext applicationContext;

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

    @Bean
    public Map<String, EurekaClient> additionalEurekaClients(ApplicationInfoManager manager,
                                                             @Autowired(required = false) HealthCheckHandler healthCheckHandler) {
        HashMap clients = new HashMap<>();

        if(Text.isEmpty(additionalZones))
            return clients;

        String[] hosts = additionalZones.split(",");
        for(int i=0; i < hosts.length; i++)
        {
            EurekaClient client = new CloudEurekaClient(manager, new SimpleEurekaClientConfig(hosts[i].trim(),"defaultZone"), null,
                    this.applicationContext);
            client.registerHealthCheck(healthCheckHandler);
            String clientName = "client_"+ (i+1);
            clients.put(clientName, client);
        }

        return clients;
    }


    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = (ConfigurableApplicationContext) applicationContext;
    }


    @PreDestroy
    public void unRegisterInAllConfiguredDiscovery() {
        Map<String, EurekaClient> additionalEurekaClients = this.applicationContext.getBean("additionalEurekaClients", Map.class);
        additionalEurekaClients.forEach((k, v) -> v.shutdown());
    }
}

package com.netflix.eureka;

import org.springframework.cloud.netflix.eureka.EurekaClientConfigBean;
import java.util.Arrays;
import java.util.List;

public class SimpleEurekaClientConfig extends EurekaClientConfigBean {

    private String eurekaUrl;
    private String zone;
    private String region = "us-east-1";

    public SimpleEurekaClientConfig(String eurekaUrl, String zone, String region) {
        this.eurekaUrl = eurekaUrl;
        this.zone = zone;
        this.region = region;
    }

    public SimpleEurekaClientConfig(String eurekaUrl, String zone) {
        this.eurekaUrl = eurekaUrl;
        this.zone = zone;
    }


    @Override
    public String getRegion() {
        return region;
    }

    @Override
    public String[] getAvailabilityZones(String s) {
        return new String[] {zone};
    }

    @Override
    public List<String> getEurekaServerServiceUrls(String s) {
        return Arrays.asList(eurekaUrl);
    }

    @Override
    public boolean shouldEnforceRegistrationAtInit() {
        return true;
    }

    @Override
    public boolean shouldRegisterWithEureka() {
        return true;
    }
}