Spring Cloud Samples Eureka - Docker - 在链接中使用下划线

Question

使用Spring Cloud,Eureka和Docker可能会遇到一个有趣的异常现象.我不确定我是否发现了一个问题,或者是否有预期的行为,但这里是要点.

我首先开始在一个命名的docker容器中运行eureka.接下来,我使用ClientDiscoveryEnabled启动docker客户端.docker客户端容器正在使用docker"link"参数来获取eureka容器中的主机名可访问性.yaml文件有一个用于连接属性驱动的Eureka的条目:

defaultZone: http://user:${eureka.password}@${host.name}:8761/eureka/

除非我尝试在容器名称中使用下划线,否则一切都很有效.如果我使用下划线来命名我的容器,则客户端容器无法使用Eureka注册完全解析此名称.如果我删除下划线,一切正常.也许我错过了一些事情,这是预期的,但我没有看到任何提及这个"功能".

我的客户来自Spring-Cloud-Samples feign-eureka项目.以下是场景......

这将工作,客户将注册:

sudo docker run -d -p=8761:8761 --name foobar chrisccoy/microsvcdemoeureka
sudo docker run -d -p=7311:7311 --name democlnt --link foobar:foobar chrisccoy/microsvcdemoclnt java -jar /opt/tst/ms_clnt.jar --host.name=foobar

以下不起作用!Eureka将启动,客户端将启动,但无法注册:

sudo docker run -d -p=8761:8761 --name foo_bar chrisccoy/microsvcdemoeureka
sudo docker run -d -p=7311:7311 --name democlnt --link foo_bar:foo_bar chrisccoy/microsvcdemoclnt java -jar /opt/tst/ms_clnt.jar --host.name=foo_bar 

以下是日志条目和后续异常:

2015-02-25 18:51:27.762 ERROR 1 --- [pool-4-thread-1] com.netflix.discovery.DiscoveryClient    : Can't get a response from http://user:password@foo_bar:8761/eureka/apps/HELLOCLIENT/172.17.0.11:HelloClient:7311
Can't contact any eureka nodes - possibly a security group issue?

com.sun.jersey.api.client.ClientHandlerException: java.lang.IllegalArgumentException: Host name may not be null
at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:184)
at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:120)
at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:28)
at com.sun.jersey.api.client.Client.handle(Client.java:648)
at com.sun.jersey.api.client.WebResource.handle(WebResource.java:680)
at com.sun.jersey.api.client.WebResource.put(WebResource.java:211)
at com.netflix.discovery.DiscoveryClient.makeRemoteCall(DiscoveryClient.java:1097)
at com.netflix.discovery.DiscoveryClient.makeRemoteCall(DiscoveryClient.java:1060)
at com.netflix.discovery.DiscoveryClient.access$500(DiscoveryClient.java:105)
at com.netflix.discovery.DiscoveryClient$HeartbeatThread.run(DiscoveryClient.java:1583)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Host name may not be null
at org.apache.http.util.Args.notBlank(Args.java:65)
at org.apache.http.HttpHost.<init>(HttpHost.java:81)
at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.getHost(ApacheHttpClient4Handler.java:190)
at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:170)
... 14 common frames omitted

我可以在运行/ bin/bash的容器中ping"foo_bar"而不会出现问题.

sudo docker run -i -t --link foo_bar:foo_bar chrisccoy/microsvcdemoclnt /bin/bash
root@0175222c11bb:~# ping foo_bar
PING foo_bar (172.17.0.12) 56(84) bytes of data.
64 bytes from foo_bar (172.17.0.12): icmp_seq=1 ttl=64 time=0.137 ms

我不确定断开连接的来源.或许这是我不知道的功能.

有任何想法吗？

Answer 1

看起来像是java.net.URI不理解域名中的下划线.请参阅此要点:https://gist.github.com/spencergibb/ced5199c80f7a6c89499和此http://bugs.java.com/bugdatabase/view_bug.do?bug_id=6587184