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EUREKA Server启动时报错com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

发表于

异常 I

spring cloud 的 eureka server 启动时出现如下错误

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09:17:44.673 [SpringContextShutdownHook] WARN  c.n.d.s.t.d.RetryableEurekaHttpClient - Request execution failed with message: java.net.ConnectException: Connection refused (Connection refused)
09:17:44.674 [SpringContextShutdownHook] ERROR c.netflix.discovery.DiscoveryClient - DiscoveryClient_REGISTER-SERVER/192.168.123.121:register-server:8012 - de-registration failedCannot 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)
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.cancel(EurekaHttpClientDecorator.java:71)
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$2.execute(EurekaHttpClientDecorator.java:74)
	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77)
	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.cancel(EurekaHttpClientDecorator.java:71)
	at com.netflix.discovery.DiscoveryClient.unregister(DiscoveryClient.java:941)
	at com.netflix.discovery.DiscoveryClient.shutdown(DiscoveryClient.java:919)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:389)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeDestroyMethods(InitDestroyAnnotationBeanPostProcessor.java:347)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeDestruction(InitDestroyAnnotationBeanPostProcessor.java:177)
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:242)
	at org.springframework.beans.factory.support.DisposableBeanAdapter.run(DisposableBeanAdapter.java:235)
	at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.destroy(GenericScope.java:403)
	at org.springframework.cloud.context.scope.GenericScope.destroy(GenericScope.java:142)
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:258)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:571)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:543)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:1072)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:504)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:1065)
	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1060)
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1029)
	at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:948)

这个错误是由于 Eureka 启动时默认会把自己注册到注册中心（默认注册中心是localhost，虽然没配置，但是有这么个默认值），而此时没有注册中心（自己是注册中心，尚未启动），所以出错了。

解决方案很简单，禁止注册就好了

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eureka:
  instance:
    preferIpAddress: true
  client:
    register-with-eureka: false
    fetch-registry: false

如果网络上已经有注册中心，也可以提供注册中心的URL，让 eureka server 能购找到注册中心也可

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eureka:
  client:
    register-with-eureka: true
    fetch-registry: false
    service-url:
      defaultZone: http://192.168.1.1/eureka/

异常 II

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09:42:18.813 [TaskBatchingWorker-target_localhost-9] ERROR c.n.e.c.ReplicationTaskProcessor - Network level connection to peer localhost; retrying after delay
com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused (Connection refused)
	at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187)
	at com.netflix.eureka.cluster.DynamicGZIPContentEncodingFilter.handle(DynamicGZIPContentEncodingFilter.java:48)
	at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27)
	at com.sun.jersey.api.client.Client.handle(Client.java:652)
	at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682)
	at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
	at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:570)
	at com.netflix.eureka.transport.JerseyReplicationClient.submitBatchUpdates(JerseyReplicationClient.java:117)
	at com.netflix.eureka.cluster.ReplicationTaskProcessor.process(ReplicationTaskProcessor.java:80)
	at com.netflix.eureka.util.batcher.TaskExecutors$BatchWorkerRunnable.run(TaskExecutors.java:193)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
	at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403)
	at java.base/java.net.Socket.connect(Socket.java:591)
	at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121)
	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
	at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144)
	at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:134)
	at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:605)
	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:440)
	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:118)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
	at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173)
	... 10 common frames omitted

erureka server 使用中出现上面的错误，这也是2个注册中心连接复制信息造成的。如果只有一个注册中心，可以用这个禁止：

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eureka:
  server:
    maxThreadsForPeerReplication: 0

原因

在微服务体系中，注册中心是十分重要的一环，注册中心如果死掉，那么所有微服务之间的通讯就没法进行了，整个系统陷入瘫痪。所以eureka才默认就开启了双机模式，这也是开发环境中出现上述2个异常的原因，没有使用双注册中心的备份机制。

生产环境应该使用双注册中心（或更多），不要开启上述几个设置仅仅屏蔽异常。