Eureka客户端启动时，报错：java.net.UnknownHostException: eureka-server

遇见的问题：在启动eureka服务的时候，正常，再启动网关组件的时候，出现如下错误：2020-04-15 11:04:07.514WARN 26540 --- [main] com.netflix.discovery.DiscoveryClient: Using default backup registry implementation which do...

姠惢荇者

5553人浏览 · 2020-04-15 11:26:05

姠惢荇者 · 2020-04-15 11:26:05 发布

遇见的问题：

在启动eureka服务的时候，正常，再启动网关组件的时候，出现如下错误：

2020-04-15 11:04:07.514  WARN 26540 --- [           main] com.netflix.discovery.DiscoveryClient    : Using default backup registry implementation which does not do anything.
2020-04-15 11:04:07.517  INFO 26540 --- [           main] com.netflix.discovery.DiscoveryClient    : Starting heartbeat executor: renew interval is: 5
2020-04-15 11:04:07.523  INFO 26540 --- [           main] c.n.discovery.InstanceInfoReplicator     : InstanceInfoReplicator onDemand update allowed rate per min is 4
2020-04-15 11:04:07.532  INFO 26540 --- [           main] com.netflix.discovery.DiscoveryClient    : Discovery Client initialized at timestamp 1586919847529 with initial instances count: 0
2020-04-15 11:04:07.542  INFO 26540 --- [           main] o.s.c.n.e.s.EurekaServiceRegistry        : Registering application MSS-GATEWAY with eureka with status UP
2020-04-15 11:04:07.543  INFO 26540 --- [           main] com.netflix.discovery.DiscoveryClient    : Saw local status change event StatusChangeEvent [timestamp=1586919847543, current=UP, previous=STARTING]
2020-04-15 11:04:07.545  INFO 26540 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_MSS-GATEWAY/localhost:mss-gateway:9030: registering service...
2020-04-15 11:04:07.551  INFO 26540 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Starting beans in phase 2147483647
2020-04-15 11:04:07.553  INFO 26540 --- [           main] d.s.w.p.DocumentationPluginsBootstrapper : Context refreshed
2020-04-15 11:04:07.558 ERROR 26540 --- [nfoReplicator-0] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error

com.sun.jersey.api.client.ClientHandlerException: java.net.UnknownHostException: eureka-server
	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-1.9.3.jar:1.9.3]
	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.post(WebResource.java:570) ~[jersey-client-1.19.1.jar:1.19.1]
	at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.register(AbstractJerseyEurekaHttpClient.java:56) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.3.jar:1.9.3]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_121]
	at java.lang.Thread.run(Unknown Source) [na:1.8.0_121]
Caused by: java.net.UnknownHostException: eureka-server
	at java.net.InetAddress.getAllByName0(Unknown Source) ~[na:1.8.0_121]
	at java.net.InetAddress.getAllByName(Unknown Source) ~[na:1.8.0_121]
	at java.net.InetAddress.getAllByName(Unknown Source) ~[na:1.8.0_121]
	at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:263) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:162) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:134) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:610) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:445) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:118) ~[httpclient-4.5.6.jar:4.5.6]
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) ~[httpclient-4.5.6.jar:4.5.6]
	at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173) ~[jersey-apache-client4-1.19.1.jar:1.19.1]
	... 30 common frames omitted

2020-04-15 11:04:07.560  WARN 26540 --- [nfoReplicator-0] c.n.d.s.t.d.RetryableEurekaHttpClient    : Request execution failed with message: java.net.UnknownHostException: eureka-server
2020-04-15 11:04:07.560  WARN 26540 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_MSS-GATEWAY/localhost:mss-gateway:9030 - registration failed Cannot execute request on any known server

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) ~[eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.3.jar:1.9.3]
	at com.netflix.discovery.InstanceInfoReplicator$1.run(InstanceInfoReplicator.java:101) [eureka-client-1.9.3.jar:1.9.3]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_121]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_121]
	at java.lang.Thread.run(Unknown Source) [na:1.8.0_121]

错误日志摘要：

com.sun.jersey.api.client.ClientHandlerException: java.net.UnknownHostException: eureka-server
com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

在eureka服务端的配置如下（部分）：

eureka:
  instance:
    #hostname: 127.0.0.1
    hostname: eureka-server
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl: 
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

在网关中的配置如下（部分）：

eureka:
  instance:
    lease-renewal-interval-in-seconds: 5
    lease-expiration-duration-in-seconds: 10
  client:
      service-url:
        #defaultZone: http://127.0.0.1:9010/eureka/ 
        defaultZone: http://eureka-server:9010/eureka/

问题原因：

在其他配置都正常的情况，我出现了这种问题，经排查其实是eureka服务端的eureka-instance-hostname命名，没有在C:\Windows\System32\drivers\etc\hosts文件进行配置造成的。

解决方法：

第一种： 在C:\Windows\System32\drivers\etc\hosts文件中添加实例名和IP地址的映射关系，如下图所示：
在这里插入图片描述
第二种： 如果不想配置这个映射，可以选择使用IP地址作为eureka-instance-hostname属性的值，这样也可以直接使用（之前就是这样使用的，所以一直没有遇见该问题），即上面配置中注释掉的代码，需要把服务端和网关中的配置都修改了才可以。

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姠惢荇者

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