Eureka客户端无法连接服务注册中心

转载自：https://my.oschina.net/kousm/blog/2249003

服务端

application.yml配置






spring:





  application:





    name: eureka-service





eureka: 





  client:





    fetch-registry: 'false'





    register-with-eureka: 'false'





  server:





    enable-self-preservation: false





    eviction-interval-timer-in-ms: 100





#eureka服务器端口





server:





  port: '21001'

EurekaApplication.java






package org.gradle;





 





import org.springframework.boot.SpringApplication;





import org.springframework.boot.autoconfigure.SpringBootApplication;





import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;





 





@EnableEurekaServer //作为服务端注解





@SpringBootApplication





public class EurekaApplication {





 





	public static void main(String[] args) throws Exception {





		SpringApplication.run(EurekaApplication.class, args);





	}





 





}

客户端

application.yml






server:





  port: '21002'





eureka:





  client:





    serviceUrl:





      defaultZone: http://服务端ip:21001/eureka/





  instance:





    instance-id: test-client





    hostname: cloud-provider





    preferIpAddress: true





    ip-address: 客户端ip





spring: 





  application: 





    name: test-client





  http:





    encoding:





      force: true





      charset: UTF-8





      enabled: true

主入口类Application.java






package org.gradle;





 





import org.springframework.boot.SpringApplication;





import org.springframework.boot.autoconfigure.SpringBootApplication;





import org.springframework.cloud.client.discovery.EnableDiscoveryClient;





 





@EnableDiscoveryClient





@SpringBootApplication





public class ApplicationClient {





	public static void main(String[] args) throws Exception {





		SpringApplication.run(ApplicationClient.class, args);





	}





}

Controller类Person.java






package org.gradle;





 





import org.springframework.web.bind.annotation.RequestMapping;





import org.springframework.web.bind.annotation.RestController;





 





@RestController





public class Person {





	@RequestMapping("/getName")





    public String getName() {





        return "hello eureka";





    }





}

eureka的服务注册中心可以正常启动起来，在启动客户端的服务的时候无法连接上注册中心。

部分报错信息如下：






2018-10-18 17:23:42.727  INFO 7852 --- [           main] com.netflix.discovery.DiscoveryClient    : Application is null : false





2018-10-18 17:23:42.727  INFO 7852 --- [           main] com.netflix.discovery.DiscoveryClient    : Registered Applications size is zero : true





2018-10-18 17:23:42.727  INFO 7852 --- [           main] com.netflix.discovery.DiscoveryClient    : Application version is -1: true





2018-10-18 17:23:42.727  INFO 7852 --- [           main] com.netflix.discovery.DiscoveryClient    : Getting all instance registry info from the eureka server





2018-10-18 17:23:44.792 ERROR 7852 --- [           main] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error





 





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-client4-1.19.1.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.jersey.AbstractJerseyEurekaHttpClient.getApplicationsInternal(AbstractJerseyEurekaHttpClient.java:194) ~[eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplications(AbstractJerseyEurekaHttpClient.java:165) ~[eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118) ~[eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79) ~[eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:119) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [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.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1022) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:936) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:412) [eureka-client-1.7.0.jar:1.7.0]





	at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:267) [eureka-client-1.7.0.jar:1.7.0]





	at org.springframework.cloud.netflix.eureka.CloudEurekaClient.<init>(CloudEurekaClient.java:61) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.eurekaClient(EurekaClientAutoConfiguration.java:261) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$5d9ea2ca.CGLIB$eurekaClient$0(<generated>) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$5d9ea2ca$$FastClassBySpringCGLIB$$1d2b2b2c.invoke(<generated>) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) [spring-core-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$5d9ea2ca.eurekaClient(<generated>) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_151]





	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_151]





	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_151]





	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_151]





	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:345) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:379) [spring-cloud-context-1.3.0.RELEASE.jar:1.3.0.RELEASE]





	at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:181) [spring-cloud-context-1.3.0.RELEASE.jar:1.3.0.RELEASE]





	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:340) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) [spring-beans-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) [spring-aop-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration.getTargetObject(EurekaRegistration.java:166) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration.getEurekaClient(EurekaRegistration.java:155) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry.maybeInitializeClient(EurekaServiceRegistry.java:56) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry.register(EurekaServiceRegistry.java:37) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.cloud.netflix.eureka.serviceregistry.EurekaAutoServiceRegistration.start(EurekaAutoServiceRegistration.java:80) [spring-cloud-netflix-eureka-client-1.4.0.RELEASE.jar:1.4.0.RELEASE]





	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:175) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:50) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:348) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:151) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:114) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:880) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:144) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]





	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]





	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]





	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]





	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]





	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]





	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]





	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]





	at org.gradle.ApplicationClient.main(ApplicationClient.java:11) [bin/:na]





Caused by: java.net.ConnectException: Connection refused: connect





	at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_151]





	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_151]





	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_151]





	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_151]





	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_151]





	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_151]





	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_151]





	at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_151]





	at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121) ~[httpclient-4.5.3.jar:4.5.3]





	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180) ~[httpclient-4.5.3.jar:4.5.3]





	at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144) ~[httpclient-4.5.3.jar:4.5.3]





	at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:134) ~[httpclient-4.5.3.jar:4.5.3]





	at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:610) ~[httpclient-4.5.3.jar:4.5.3]





	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:445) ~[httpclient-4.5.3.jar:4.5.3]





	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) ~[httpclient-4.5.3.jar:4.5.3]





	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:118) ~[httpclient-4.5.3.jar:4.5.3]





	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) ~[httpclient-4.5.3.jar:4.5.3]





	at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173) ~[jersey-apache-client4-1.19.1.jar:1.19.1]





	... 68 common frames omitted

通过网上搜索，大部分的回答如下几种

一、客户端配置文件中关键字需准守驼峰命名方式






eureka:





  client:





    serviceUrl:





      defaultZone: http://localhost:21001/eureka/

上述代码中的serviceUrl不应使用service-url，defaultZone不应使用default-zone

二、eureka服务端应关闭鉴权

需要在服务器端的配置文件中加入关闭鉴权的代码






security: 





  basic: 





    enabled: false

三、如果启动eureka服务端报这种错误，则需要禁止服务端作为客户端注册。默认情况下eureka的服务注册中心会将自己作为客户端来尝试注册。

需要在服务端的配置文件中加入禁止注册的代码






eureka: 





  client:





    fetch-registry: 'false'





    register-with-eureka: 'false'

但是，上述三种方式依然没有解决我遇到的问题，最后发现是因为我客户端的配置文件位置放错了

application.yml文件应直接放在resources目录下：

重新启动服务，OK，成功。

原文地址;https://blog.csdn.net/qq_40460909/article/details/86248390

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