先运行了，EurekaApplication 后运行 ZuulApplication。但在运行ZuulApplication时报错如下：

2019-12-23 09:16:30.569 ERROR 18922 --- [      Thread-23] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://server1:8000/eureka/}com.sun.jersey.api.client.ClientHandlerException: java.net.UnknownHostException: server1: nodename nor servname provided, or not known	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-1.9.8.jar:1.9.8]	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.delete(WebResource.java:591) ~[jersey-client-1.19.1.jar:1.19.1]	at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.cancel(AbstractJerseyEurekaHttpClient.java:76) ~[eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$2.execute(EurekaHttpClientDecorator.java:74) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.cancel(EurekaHttpClientDecorator.java:71) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$2.execute(EurekaHttpClientDecorator.java:74) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118) ~[eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79) ~[eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.cancel(EurekaHttpClientDecorator.java:71) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$2.execute(EurekaHttpClientDecorator.java:74) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.cancel(EurekaHttpClientDecorator.java:71) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$2.execute(EurekaHttpClientDecorator.java:74) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.cancel(EurekaHttpClientDecorator.java:71) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.DiscoveryClient.unregister(DiscoveryClient.java:923) [eureka-client-1.9.8.jar:1.9.8]	at com.netflix.discovery.DiscoveryClient.shutdown(DiscoveryClient.java:901) [eureka-client-1.9.8.jar:1.9.8]	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_221]	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_221]	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_221]	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_221]	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeDestroyMethods(InitDestroyAnnotationBeanPostProcessor.java:321) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeDestruction(InitDestroyAnnotationBeanPostProcessor.java:156) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:240) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.support.DisposableBeanAdapter.run(DisposableBeanAdapter.java:233) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.destroy(GenericScope.java:404) [spring-cloud-context-2.1.0.RELEASE.jar:2.1.0.RELEASE]	at org.springframework.cloud.context.scope.GenericScope.destroy(GenericScope.java:139) [spring-cloud-context-2.1.0.RELEASE.jar:2.1.0.RELEASE]	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:256) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:571) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:543) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:1055) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:504) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:1062) [spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1057) [spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1026) [spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]	at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:945) [spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]Caused by: java.net.UnknownHostException: server1: nodename nor servname provided, or not known	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.8.0_221]	at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929) ~[na:1.8.0_221]	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324) ~[na:1.8.0_221]	at java.net.InetAddress.getAllByName0(InetAddress.java:1277) ~[na:1.8.0_221]	at java.net.InetAddress.getAllByName(InetAddress.java:1193) ~[na:1.8.0_221]	at java.net.InetAddress.getAllByName(InetAddress.java:1127) ~[na:1.8.0_221]	at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:263) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:162) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:134) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:605) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:440) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:118) ~[httpclient-4.5.8.jar:4.5.8]	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56) ~[httpclient-4.5.8.jar:4.5.8]	at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173) ~[jersey-apache-client4-1.19.1.jar:1.19.1]	... 42 common frames omitted