"Cannot execute request on any known server" when i set up a Eureka cluster by skyDns

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zhining fang

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Apr 15, 2016, 11:55:21 PM4/15/16

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When i refer to "https://github.com/Netflix/eureka/wiki/Configuring-Eureka-in-AWS-Cloud", i want to set up a Eureka cluster by skyDns.

this is all the configuration of my eureka-client :

# Region where the application is deployed.

# - for AWS specify one of the AWS regions

# - for other datacenters specify a arbitrary string indicating the region.

# This is normally specified as a -D option (eg) -Deureka.region=us-east-1

eureka.region=us-east-1

# Name of the application to be identified by other services (in this case, it is the eureka service itself)

eureka.name=eureka

# Virtual host name by which the clients identifies this service (in this case, it is the eureka service itself)

#eureka.vipAddress=eureka.mydomain.net

# The port where the service will be identified and will be serving requests

eureka.port=8080

# Set to false as this config is for the eureka client in the eureka server itself.

# The eureka clients running in eureka server needs to connect to servers in other zones.

# For other applications this should not be set (default to true) for better zone based load balancing.

#eureka.preferSameZone=false

## ------------------------------------------------------------------------------

## The below properties govern how clients should connect to eureka servers.

## In general these can be the same for all clients in the same eureka ecosystem.

## ------------------------------------------------------------------------------

# Change this if you want to use a DNS based lookup for determining other eureka servers (see example below)

eureka.shouldUseDns=true

# Since shouldUseDns is false, we use the following properties to explicitly specify the route to the eureka servers

eureka.serviceUrl.default=http://localhost:8080/eureka/v2/

# for the eureka server's own client config, set on-demand update to false as it may be too quick for the REST

# resource initialization

eureka.shouldOnDemandUpdateStatusChange=false

eureka.eurekaServer.domainName=bar.skydns.paas

eureka.eurekaServer.context=eureka/v2

eureka.eurekaServer.port=8080

In my skydns, i set TXT records,

the result are follows:

command: dig txt.us-east-1.bar.skydns.paas txt

result:

;; QUESTION SECTION:

;txt.us-east-1.bar.skydns.paas. IN TXT

;; ANSWER SECTION:

txt.us-east-1.bar.skydns.paas. 3600 IN TXT "us-east-1c.bar.skydns.paas"

txt.us-east-1.bar.skydns.paas. 3600 IN TXT "us-east-1d.bar.skydns.paas"

command: dig txt.us-east-1c.bar.skydns.paas txt

result:

;; QUESTION SECTION:

;t.us-east-1c.bar.skydns.paas. IN TXT

;; ANSWER SECTION:

txt.us-east-1c.bar.skydns.paas. 3600 IN TXT "http://10.120.180.235:8080/discovery/v2/"

i can get the response of "dig txt.us-east-1d.bar.skydns.paas txt" too. the answer is : txt.us-east-1d.bar.skydns.paas. 3600 IN TXT "http://10.120.180.117:8080/discovery/v2/"

At last,when i startup the tomcat, there are some problems :

2016-04-16 11:43:36,565 ERROR com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient:83 [localhost-startStop-1] [execute] Request execution error

com.sun.jersey.api.client.ClientHandlerException: java.net.UnknownHostException: http: unknown error

at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187)

at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123)

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.get(WebResource.java:509)

at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplicationsInternal(AbstractJerseyEurekaHttpClient.java:194)

at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplications(AbstractJerseyEurekaHttpClient.java:165)

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)

at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73)

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)

at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118)

at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79)

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)

at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:119)

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137)

at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77)

at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134)

at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1013)

at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:927)

at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:441)

at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:304)

at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:300)

at com.netflix.eureka.EurekaBootStrap.initEurekaServerContext(EurekaBootStrap.java:147)

at com.netflix.eureka.EurekaBootStrap.contextInitialized(EurekaBootStrap.java:96)

at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)

at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)

at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)

at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:939)

at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1812)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.net.UnknownHostException: http: unknown error

at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)

at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)

at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)

at java.net.InetAddress.getAllByName0(InetAddress.java:1276)

at java.net.InetAddress.getAllByName(InetAddress.java:1192)

at java.net.InetAddress.getAllByName(InetAddress.java:1126)

at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:44)

at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:259)

at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:159)

at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144)

at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131)

at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)

at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)

at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)

at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:115)

at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)

at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173)

... 41 more

2016-04-16 11:43:36,578 WARN com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient:129 [localhost-startStop-1] [execute] Request execution failure

2016-04-16 11:43:36,580 ERROR com.netflix.discovery.DiscoveryClient:934 [localhost-startStop-1] [fetchRegistry] DiscoveryClient_EUREKA/SZV1000048497 - was unable to refresh its cache! status = 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:111)