尤里卡同伴意识示例不起作用

Question

我在运行 Eureka 服务器示例以了解对等感知概念时遇到问题。 我有以下 Eureka 服务：

package com.micro.eurekaserver;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableDiscoveryClient
@EnableEurekaServer
public class EurekaServerMicroServiceApplication {

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

application.yml

 ---
spring:
  profiles: peer1
server:
  port: 8761
eureka:
  instance:
    hostname: peer1
  client:
    serviceUrl:
      defaultZone: http://peer2:8762/eureka/

---
spring:
  profiles: peer2
server:
  port: 8762
eureka:
  instance:
    hostname: peer2
  client:
    serviceUrl:
      defaultZone: http://peer1:8761/eureka/

bootstrap.yml

spring:
  application:
    name: eureka

等/主机

127.0.0.1   peer1
127.0.0.1   peer2
localhost   peer1
localhost   peer2

当我运行这个 Eureka 服务时，我不断收到以下异常：

2016-03-26 12:19:57.708 错误 4940 --- [主要]

com.netflix.discovery.DiscoveryClient    : Can't contact any eureka nodes - possibly a security group issue?

com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect
    at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.jar:1.19]
    at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.jar:1.19]
    at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.3.7.jar:1.3.7]
    at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.jar:1.19]
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.jar:1.19]
    at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[jersey-client-1.19.jar:1.19]
    at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:509) ~[jersey-client-1.19.jar:1.19]
    at com.netflix.discovery.DiscoveryClient.getUrl(DiscoveryClient.java:1802) [eureka-client-1.3.7.jar:1.3.7]
    at com.netflix.discovery.DiscoveryClient.makeRemoteCall(DiscoveryClient.java:1546) [eureka-client-1.3.7.jar:1.3.7]
    at com.netflix.discovery.DiscoveryClient.makeRemoteCallWithFollowRedirect(DiscoveryClient.java:1460) [eureka-client-1.3.7.jar:1.3.7]
    at com.netflix.discovery.DiscoveryClient.makeRemoteCall(DiscoveryClient.java:1443) [eureka-client-1.3.7.jar:1.3.7]
    at com.netflix.discovery.DiscoveryClient.makeRemoteCall(DiscoveryClient.java:1394) [eureka-client-1.3.7.jar:1.3.7]

2016-03-26 12:23:09.963 ERROR 4940 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EUREKA/KHUJEMA-PC:eureka - was unable to send heartbeat!

com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect
    at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.jar:1.19]
    at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.jar:1.19]
    at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.3.7.jar:1.3.7]
    at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.jar:1.19]
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.jar:1.19]

我能够成功地使用单个实例运行 Eureka 服务。我只面临两个实例的问题。以下来自 github 的演示示例：[https://github.com/rcapraro/spring-cloud-sample][1]

我在日志中还注意到，tomcat 嵌入式服务器在端口 8080 而不是 8761/8762 上启动，不知道为什么？

请帮忙！

Answer 1

尝试从 Application.java 中删除 @EnableDiscoveryClient。我的看起来像这样：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class Application {

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

Answer 2

如果 Eureka 仍然从 8080 开始，很可能您没有通过活动的 Spring 配置文件。

每个实例都需要启动为：

java -Dspring.profiles.active=peer1 target/<artifact>.jar

和

java -Dspring.profiles.active=peer2 target/<artifact>.jar

顺便说一句，我建议以不同的方式启动实例，我认为这不是很好，如果您需要启动第三个实例怎么办？使用此设置，您可能需要修改 application.yml 以添加第三个配置文件，看到问题了吗？

我最近写了一篇关于Microservices Registration and Discovery using Spring Cloud Eureka Ribbon and Feign 的博客，其中我介绍了使用Spring 配置文件在standalone 和peerAware 模式下运行Eureka。在peerAware 配置文件中，我使用VM 参数传递了其他Eureka 实例的位置，因此无需更改代码即可启动新实例。它还涵盖了使用Feign、Ribbon 和RestTemplate 的负载平衡请求，并且使用Jersey 1 和Spring REST 实现了客户端。

Answer 3

我有同样的问题，搜索了很多没有运气！

最后，我只是将配置文件修改为配置文件，效果惊人：

spring:
  profile: peer1

而不是：

spring:
   profiles: peer1