解决Eureka Server高可用搭建时报错无法注册问题

2019独角兽企业重金招聘Python工程师标准>>>

    本机测试搭建Eureka Server的高可用环境，启动后报错如下：

com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: 拒绝连接 (Connection refused)
        at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar!/:1.19.1]
        at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.1.jar!/:1.19.1]
        at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.7.0.jar!/:1.7.0]
        at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.1.jar!/:1.19.1]
        at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.1.jar!/:1.19.1]
        at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[jersey-client-1.19.1.jar!/:1.19.1]
        at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:509) ~[jersey-client-1.19.1.jar!/:1.19.1]
        at 
......
com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
        at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:111) ~[eureka-client-1.7.0.jar!/:1.7.0]
        at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.7.0.jar!/:1.7.0]
        at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.7.0.jar!/:1.7.0]
        at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.7.0.jar!/:1.7.0]
        at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.7.0.jar!/:1.7.0]
        at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:807) ~[eureka-client-1.7.0.jar!/:1.7.0]
        at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:104) ~[eureka-client-1.7.0.jar!/:1.7.0]
        at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:88) [eureka-client-1.7.0.jar!/:1.7.0]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_192]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_192]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_192]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_192]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_192]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_192]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_192]

    application.yml的内容：

spring:
  application:
    name: microservice-discovery-eureka-ha
---
spring:
  profiles: peer1                                 # 指定profile=peer1
server:
  port: 8761
eureka:
  instance:
    hostname: peer1                               # 指定当profile=peer1时，主机名是peer1
  client:
    serviceUrl:
      defaultZone: http://peer2:8762/eureka/      # 将自己注册到peer2这个Eureka上面去
---
spring:
  profiles: peer2
server:
  port: 8762
eureka:
  instance:
    hostname: peer2
  client:
    serviceUrl:
      defaultZone: http://peer1:8761/eureka/

 

    最后找到解决办法，把里面的 spring.application.name改为驼峰格式：

spring:
  application:
    name: microserviceDiscoveryEurekaHa           # 解决 TransportException

    最后重新启动，集群OK，没问题：

2018-12-02 21:22:25.380  INFO 8546 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient    : Getting all instance registry info from the eureka server
2018-12-02 21:22:25.399  INFO 8546 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_MICROSERVICEDISCOVERYEUREKAHA/192.168.2.110:microserviceDiscoveryEurekaHa:8761 - Re-registering apps/MICROSERVICEDISCOVERYEUREKAHA
2018-12-02 21:22:25.399  INFO 8546 --- [tbeatExecutor-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_MICROSERVICEDISCOVERYEUREKAHA/192.168.2.110:microserviceDiscoveryEurekaHa:8761: registering service...
2018-12-02 21:22:25.403  INFO 8546 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient    : The response status is 200

 

    为什么改为驼峰就能解决问题，背后的原理暂时还不知道，加个TODO，等后面看到这部分，回过头来补充。

 

转载于:https://my.oschina.net/javamaster/blog/2966582