springCloud的eureka高可用配置方案思路是：几个服务中心之间相互注册，比如两个注册中心，A注册到B上，B注册到A上，如果是三个注册中心则是：A注册到BC上，B注册到AC上，C注册到AB上，这样就会在几个注册中心间进行同步，同时服务提供方向三个注册中心均注册，这样就会保证当一个服务注册中心宕机的时候，不影响整个系统的正常运行，从而保证了eureka的高可用。本博主在最后验证了服务提供方仅注册到其中一个的方法，其高可靠性也是有保障的。所以服务提供方只需向服务注册中心之一提供注册就可以了，他们之间可以自行同步，保证高可用性。

　　下面贴出主要的配置代码，其他的都一样，我们在这里主要贴出yml配置和控制台效果

8880

 #本项目端口

 server:

   port: 8880

 #定义应用名称为order

 spring:

   application:

     name: server

 #服务注册中心实例主机名

 eureka:

   instance:

     hostname: host

   client:

 #是否向注册中心注册自己

     register-with-eureka: false

 #是否获取注册表

     fetch-registry: false

     service-url:

       defaultZone: http://127.0.0.1:8881/eureka/,http://127.0.0.1:8882/eureka/

8881

 #本项目端口

 server:

   port: 8881

 #定义应用名称为order

 spring:

   application:

     name: server1

 #服务注册中心实例主机名

 eureka:

   instance:

     hostname: host1

   client:

 #是否向注册中心注册自己

     register-with-eureka: false

 #是否获取注册表

     fetch-registry: false

     service-url:

       defaultZone: http://127.0.0.1:8880/eureka/,http://127.0.0.1:8882/eureka/

8882

 server:

   port: 8882

 #定义应用名称为order

 spring:

   application:

     name: server2

 #服务注册中心实例主机名

 eureka:

   instance:

     hostname: host2

   client:

 #是否向注册中心注册自己

     register-with-eureka: true

 #是否获取注册表

     fetch-registry: false

 #服务地址

     service-url:

       defaultZone: http://127.0.0.1:8880/eureka/,http://127.0.0.1:8881/eureka/

注意8880和8881未向自己注册，8002向自己注册，分别启动服务，8880和8881均未出现任何报错，而8882启动成功后会有超时报错信息

 2018-09-20 10:16:13.038  INFO 7944 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@4ec4f3a0: startup date [Thu Sep 20 10:16:13 CST 2018]; root of context hierarchy

 2018-09-20 10:16:13.286  INFO 7944 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring

 2018-09-20 10:16:13.307  INFO 7944 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'configurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$fbb30aa3] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

   .   ____          _            __ _ _

  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

 ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

   '  |____| .__|_| |_|_| |_\__, | / / / /

  =========|_|==============|___/=/_/_/_/

  :: Spring Boot ::        (v2.0.5.RELEASE)

 2018-09-20 10:16:13.560  INFO 7944 --- [           main] c.sharp.forward.EurekaServerApplication  : No active profile set, falling back to default profiles: default

 2018-09-20 10:16:13.574  INFO 7944 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@74589991: startup date [Thu Sep 20 10:16:13 CST 2018]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@4ec4f3a0

 2018-09-20 10:16:14.384  INFO 7944 --- [           main] o.s.cloud.context.scope.GenericScope     : BeanFactory id=86aa96a4-8d41-33fd-af49-92950d537d77

 2018-09-20 10:16:14.399  INFO 7944 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring

 2018-09-20 10:16:14.477  INFO 7944 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$fbb30aa3] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

 2018-09-20 10:16:14.932  INFO 7944 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8880 (http)

 2018-09-20 10:16:14.951  INFO 7944 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]

 2018-09-20 10:16:14.951  INFO 7944 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.34

 2018-09-20 10:16:14.958  INFO 7944 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [D:\topbandSoft\java\jre1.8\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;D:/topbandSoft/java/jre1.8/bin/server;D:/topbandSoft/java/jre1.8/bin;D:/topbandSoft/java/jre1.8/lib/amd64;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Java\jre7;D:\topbandSoft\java\jdk1.8\bin;D:\topbandSoft\java\jdk1.8\jre\bin;D:\topbandSoft\git\Git\cmd;D:\topbandSoft\svn\bin;D:\topbandSoft\maven\apache-maven-3.3.9-bin\apache-maven-3.3.9\bin;C:\Program Files\bin;D:\topbandSoft\zookeeper/bin;D:\topbandSoft\zookeeper/conf;;D:\topbandSoft\eclipse4.8\eclipse;;.]

 2018-09-20 10:16:15.067  INFO 7944 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

 2018-09-20 10:16:15.067  INFO 7944 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1493 ms

 2018-09-20 10:16:15.230  WARN 7944 --- [ost-startStop-1] c.n.c.sources.URLConfigurationSource     : No URLs will be polled as dynamic configuration sources.

 2018-09-20 10:16:15.231  INFO 7944 --- [ost-startStop-1] c.n.c.sources.URLConfigurationSource     : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.

 2018-09-20 10:16:15.243  INFO 7944 --- [ost-startStop-1] c.netflix.config.DynamicPropertyFactory  : DynamicPropertyFactory is initialized with configuration sources: com.netflix.config.ConcurrentCompositeConfiguration@7443d25a

 2018-09-20 10:16:16.136  INFO 7944 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]

 2018-09-20 10:16:16.136  INFO 7944 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'webMvcMetricsFilter' to: [/*]

 2018-09-20 10:16:16.136  INFO 7944 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]

 2018-09-20 10:16:16.136  INFO 7944 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]

 2018-09-20 10:16:16.136  INFO 7944 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]

 2018-09-20 10:16:16.137  INFO 7944 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpTraceFilter' to: [/*]

 2018-09-20 10:16:16.137  INFO 7944 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'servletContainer' to urls: [/eureka/*]

 2018-09-20 10:16:16.137  INFO 7944 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]

 2018-09-20 10:16:16.201  INFO 7944 --- [ost-startStop-1] c.s.j.s.i.a.WebApplicationImpl           : Initiating Jersey application, version 'Jersey: 1.19.1 03/11/2016 02:08 PM'

 2018-09-20 10:16:16.251  INFO 7944 --- [ost-startStop-1] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson

 2018-09-20 10:16:16.252  INFO 7944 --- [ost-startStop-1] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson

 2018-09-20 10:16:16.348  INFO 7944 --- [ost-startStop-1] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml

 2018-09-20 10:16:16.348  INFO 7944 --- [ost-startStop-1] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml

 2018-09-20 10:16:16.561  WARN 7944 --- [           main] c.n.c.sources.URLConfigurationSource     : No URLs will be polled as dynamic configuration sources.

 2018-09-20 10:16:16.561  INFO 7944 --- [           main] c.n.c.sources.URLConfigurationSource     : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.

 2018-09-20 10:16:16.621  INFO 7944 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

 2018-09-20 10:16:16.769  INFO 7944 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@74589991: startup date [Thu Sep 20 10:16:13 CST 2018]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@4ec4f3a0

 2018-09-20 10:16:16.822  INFO 7944 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)

 2018-09-20 10:16:16.823  INFO 7944 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)

 2018-09-20 10:16:16.832  INFO 7944 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/],methods=[GET]}" onto public java.lang.String org.springframework.cloud.netflix.eureka.server.EurekaController.status(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.Object>)

 2018-09-20 10:16:16.834  INFO 7944 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/lastn],methods=[GET]}" onto public java.lang.String org.springframework.cloud.netflix.eureka.server.EurekaController.lastn(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.Object>)

 2018-09-20 10:16:16.858  INFO 7944 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

 2018-09-20 10:16:16.858  INFO 7944 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

 2018-09-20 10:16:17.166  INFO 7944 --- [           main] o.s.ui.freemarker.SpringTemplateLoader   : SpringTemplateLoader for FreeMarker: using resource loader [org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@74589991: startup date [Thu Sep 20 10:16:13 CST 2018]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@4ec4f3a0] and template loader path [classpath:/templates/]

 2018-09-20 10:16:17.167  INFO 7944 --- [           main] o.s.w.s.v.f.FreeMarkerConfigurer         : ClassTemplateLoader for Spring macros added to FreeMarker configuration

 2018-09-20 10:16:17.321  INFO 7944 --- [           main] o.s.c.n.eureka.InstanceInfoFactory       : Setting initial instance status as: STARTING

 2018-09-20 10:16:17.353  INFO 7944 --- [           main] com.netflix.discovery.DiscoveryClient    : Initializing Eureka in region us-east-1

 2018-09-20 10:16:17.353  INFO 7944 --- [           main] com.netflix.discovery.DiscoveryClient    : Client configured to neither register nor query for data.

 2018-09-20 10:16:17.362  INFO 7944 --- [           main] com.netflix.discovery.DiscoveryClient    : Discovery Client initialized at timestamp 1537409777361 with initial instances count: 0

 2018-09-20 10:16:17.409  INFO 7944 --- [           main] c.n.eureka.DefaultEurekaServerContext    : Initializing ...

 2018-09-20 10:16:17.412  INFO 7944 --- [           main] c.n.eureka.cluster.PeerEurekaNodes       : Adding new peer nodes [http://127.0.0.1:8881/eureka/, http://127.0.0.1:8882/eureka/]

 2018-09-20 10:16:17.612  INFO 7944 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson

 2018-09-20 10:16:17.612  INFO 7944 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson

 2018-09-20 10:16:17.612  INFO 7944 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml

 2018-09-20 10:16:17.612  INFO 7944 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml

 2018-09-20 10:16:17.696  INFO 7944 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson

 2018-09-20 10:16:17.696  INFO 7944 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson

 2018-09-20 10:16:17.696  INFO 7944 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml

 2018-09-20 10:16:17.696  INFO 7944 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml

 2018-09-20 10:16:17.756  INFO 7944 --- [           main] c.n.eureka.cluster.PeerEurekaNodes       : Replica node URL:  http://127.0.0.1:8881/eureka/

 2018-09-20 10:16:17.756  INFO 7944 --- [           main] c.n.eureka.cluster.PeerEurekaNodes       : Replica node URL:  http://127.0.0.1:8882/eureka/

 2018-09-20 10:16:17.762  INFO 7944 --- [           main] c.n.e.registry.AbstractInstanceRegistry  : Finished initializing remote region registries. All known remote regions: []

 2018-09-20 10:16:17.763  INFO 7944 --- [           main] c.n.eureka.DefaultEurekaServerContext    : Initialized

 2018-09-20 10:16:17.784  INFO 7944 --- [           main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 2 endpoint(s) beneath base path '/actuator'

 2018-09-20 10:16:17.793  INFO 7944 --- [           main] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/health],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)

 2018-09-20 10:16:17.793  INFO 7944 --- [           main] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/info],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)

 2018-09-20 10:16:17.794  INFO 7944 --- [           main] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto protected java.util.Map<java.lang.String, java.util.Map<java.lang.String, org.springframework.boot.actuate.endpoint.web.Link>> org.springframework.boot.actuate.endpoint.web.servlet.WebMvcEndpointHandlerMapping.links(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)

 2018-09-20 10:16:17.831  INFO 7944 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup

 2018-09-20 10:16:17.837  INFO 7944 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Bean with name 'environmentManager' has been autodetected for JMX exposure

 2018-09-20 10:16:17.838  INFO 7944 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Bean with name 'refreshScope' has been autodetected for JMX exposure

 2018-09-20 10:16:17.839  INFO 7944 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Bean with name 'configurationPropertiesRebinder' has been autodetected for JMX exposure

 2018-09-20 10:16:17.841  INFO 7944 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Located managed bean 'environmentManager': registering with JMX server as MBean [org.springframework.cloud.context.environment:name=environmentManager,type=EnvironmentManager]

 2018-09-20 10:16:17.848  INFO 7944 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Located managed bean 'refreshScope': registering with JMX server as MBean [org.springframework.cloud.context.scope.refresh:name=refreshScope,type=RefreshScope]

 2018-09-20 10:16:17.855  INFO 7944 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Located managed bean 'configurationPropertiesRebinder': registering with JMX server as MBean [org.springframework.cloud.context.properties:name=configurationPropertiesRebinder,context=74589991,type=ConfigurationPropertiesRebinder]

 2018-09-20 10:16:17.863  INFO 7944 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Starting beans in phase 0

 2018-09-20 10:16:17.867  INFO 7944 --- [           main] o.s.c.n.e.s.EurekaServiceRegistry        : Registering application server with eureka with status UP

 2018-09-20 10:16:17.881  INFO 7944 --- [      Thread-13] o.s.c.n.e.server.EurekaServerBootstrap   : Setting the eureka configuration..

 2018-09-20 10:16:17.881  INFO 7944 --- [      Thread-13] o.s.c.n.e.server.EurekaServerBootstrap   : Eureka data center value eureka.datacenter is not set, defaulting to default

 2018-09-20 10:16:17.881  INFO 7944 --- [      Thread-13] o.s.c.n.e.server.EurekaServerBootstrap   : Eureka environment value eureka.environment is not set, defaulting to test

 2018-09-20 10:16:17.892  INFO 7944 --- [      Thread-13] o.s.c.n.e.server.EurekaServerBootstrap   : isAws returned false

 2018-09-20 10:16:17.892  INFO 7944 --- [      Thread-13] o.s.c.n.e.server.EurekaServerBootstrap   : Initialized server context

 2018-09-20 10:16:17.892  INFO 7944 --- [      Thread-13] c.n.e.r.PeerAwareInstanceRegistryImpl    : Got 1 instances from neighboring DS node

 2018-09-20 10:16:17.892  INFO 7944 --- [      Thread-13] c.n.e.r.PeerAwareInstanceRegistryImpl    : Renew threshold is: 1

 2018-09-20 10:16:17.892  INFO 7944 --- [      Thread-13] c.n.e.r.PeerAwareInstanceRegistryImpl    : Changing status to UP

 2018-09-20 10:16:17.908  INFO 7944 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8880 (http) with context path ''

 2018-09-20 10:16:17.909  INFO 7944 --- [      Thread-13] e.s.EurekaServerInitializerConfiguration : Started Eureka Server

 2018-09-20 10:16:17.910  INFO 7944 --- [           main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8880

 2018-09-20 10:16:17.912  INFO 7944 --- [           main] c.sharp.forward.EurekaServerApplication  : Started EurekaServerApplication in 5.373 seconds (JVM running for 5.771)

 2018-09-20 10:16:21.748  INFO 7944 --- [nio-8880-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'

 2018-09-20 10:16:21.748  INFO 7944 --- [nio-8880-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started

 2018-09-20 10:16:21.766  INFO 7944 --- [nio-8880-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 16 ms

 2018-09-20 10:17:07.667  INFO 7944 --- [io-8880-exec-10] c.n.e.registry.AbstractInstanceRegistry  : Registered instance SERVER2/hh-PC:server2:8882 with status UP (replication=false)

 2018-09-20 10:17:08.688 ERROR 7944 --- [et_127.0.0.1-18] c.n.e.cluster.ReplicationTaskProcessor   : It seems to be a socket read timeout exception, it will retry later. if it continues to happen and some eureka node occupied all the cpu time, you should set property 'eureka.server.peer-node-read-timeout-ms' to a bigger value

 com.sun.jersey.api.client.ClientHandlerException: java.net.SocketTimeoutException: Read timed out

     at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1]

     at com.netflix.eureka.cluster.DynamicGZIPContentEncodingFilter.handle(DynamicGZIPContentEncodingFilter.java:48) ~[eureka-core-1.9.3.jar:1.9.3]

     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.eureka.transport.JerseyReplicationClient.submitBatchUpdates(JerseyReplicationClient.java:116) ~[eureka-core-1.9.3.jar:1.9.3]

     at com.netflix.eureka.cluster.ReplicationTaskProcessor.process(ReplicationTaskProcessor.java:80) ~[eureka-core-1.9.3.jar:1.9.3]

     at com.netflix.eureka.util.batcher.TaskExecutors$BatchWorkerRunnable.run(TaskExecutors.java:187) [eureka-core-1.9.3.jar:1.9.3]

     at java.lang.Thread.run(Unknown Source) [na:1.8.0_171]

 Caused by: java.net.SocketTimeoutException: Read timed out

     at java.net.SocketInputStream.socketRead0(Native Method) ~[na:1.8.0_171]

     at java.net.SocketInputStream.socketRead(Unknown Source) ~[na:1.8.0_171]

     at java.net.SocketInputStream.read(Unknown Source) ~[na:1.8.0_171]

     at java.net.SocketInputStream.read(Unknown Source) ~[na:1.8.0_171]

     at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:161) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.io.SocketInputBuffer.fillBuffer(SocketInputBuffer.java:82) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:278) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:286) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:257) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:230) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:684) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:486) ~[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]

     ... 10 common frames omitted

 2018-09-20 10:17:08.693 ERROR 7944 --- [et_127.0.0.1-16] c.n.e.cluster.ReplicationTaskProcessor   : It seems to be a socket read timeout exception, it will retry later. if it continues to happen and some eureka node occupied all the cpu time, you should set property 'eureka.server.peer-node-read-timeout-ms' to a bigger value

 com.sun.jersey.api.client.ClientHandlerException: java.net.SocketTimeoutException: Read timed out

     at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1]

     at com.netflix.eureka.cluster.DynamicGZIPContentEncodingFilter.handle(DynamicGZIPContentEncodingFilter.java:48) ~[eureka-core-1.9.3.jar:1.9.3]

     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.eureka.transport.JerseyReplicationClient.submitBatchUpdates(JerseyReplicationClient.java:116) ~[eureka-core-1.9.3.jar:1.9.3]

     at com.netflix.eureka.cluster.ReplicationTaskProcessor.process(ReplicationTaskProcessor.java:80) ~[eureka-core-1.9.3.jar:1.9.3]

     at com.netflix.eureka.util.batcher.TaskExecutors$BatchWorkerRunnable.run(TaskExecutors.java:187) [eureka-core-1.9.3.jar:1.9.3]

     at java.lang.Thread.run(Unknown Source) [na:1.8.0_171]

 Caused by: java.net.SocketTimeoutException: Read timed out

     at java.net.SocketInputStream.socketRead0(Native Method) ~[na:1.8.0_171]

     at java.net.SocketInputStream.socketRead(Unknown Source) ~[na:1.8.0_171]

     at java.net.SocketInputStream.read(Unknown Source) ~[na:1.8.0_171]

     at java.net.SocketInputStream.read(Unknown Source) ~[na:1.8.0_171]

     at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:161) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.io.SocketInputBuffer.fillBuffer(SocketInputBuffer.java:82) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:278) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:286) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:257) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:230) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) ~[httpcore-4.4.10.jar:4.4.10]

     at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:684) ~[httpclient-4.5.6.jar:4.5.6]

     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:486) ~[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]

     ... 10 common frames omitted

 2018-09-20 10:17:17.897  INFO 7944 --- [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 0ms

 2018-09-20 10:18:17.897  INFO 7944 --- [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 0ms

 2018-09-20 10:19:17.898  INFO 7944 --- [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 0ms

 2018-09-20 10:20:17.898  INFO 7944 --- [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 0ms

 2018-09-20 10:21:17.899  INFO 7944 --- [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 0ms

 2018-09-20 10:22:17.899  INFO 7944 --- [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 0ms

这是因为服务向自己注册的原因，不用理会

此时查看控制台发现三个服务均注册上了server2

如果三个服务都注册自己，则三个均注册上来，贴出其中一个图看看

这时，eureka的高可用服务其实已经配置好了，我们进行一个注册服务，还是之前的client服务，配置文件修改后如下：

 spring:

   application:

     name: client

 server:

   port: 8889

 eureka:

   client:

     eureka-server-port: 8889

     register-with-eureka: true

     service-url:

       defaultZone: http://127.0.0.1:8880/eureka/,http://127.0.0.1:8881/eureka/,http://127.0.0.1:8882/eureka/

启动服务，三台服务均注册上

然后我们请求服务方地址，成功

此时验证高可用性，我们停掉其中的1~2台服务，再次访问，仍然OK,说明高可用配置的成功,接下来我们把client的yml文件注册地址只保留一个8880，再次测试，发现只注册一个三个都会同步，当宕掉8880和其他任意一个，仍然可以成功调用接口，可见其高可用性能得到了较好保证。

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