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From Gavin McDonald <gmcdon...@apache.org>
Subject Re: Name resolution issue on ubuntu jenkins slaves?
Date Thu, 20 Aug 2015 10:15:20 GMT

> On 20 Aug 2015, at 4:03 am, David Nalley <david@gnsa.us> wrote:
> 
> Whatever we are using for DNS on those build slaves is redirecting any
> NXDOMAIN to a Level3 search domain.
> 
> Is this happening on the ubuntu-* slaves or on the dynamic build slaves?

It was mentioned earlier :

>  I am certainly seeing this on slaves ubuntu4
> through ubuntu6.

I have seen passes and failures on the dynamic slaves too, so seems inconsistent.

Gav…

> 
> --David
> 
> On Mon, Aug 10, 2015 at 8:59 AM, Keith W <keith.wall@gmail.com> wrote:
>> Hello Apache builds,
>> 
>> We (Apache Qpid) have been seeing a test fail on the Ubuntu Jenkins slaves
>> since August 9th.  The test verifies the behaviour of the code when the
>> user specifies a hostname that does not exist in DNS.  For this purpose,
>> the test uses a random name 'hg3sgaaw4lgihjs' (without hierarchal part)
>> which is assumed not resolve.  This test is longstanding and has been
>> running on the slaves for many years without issue.
>> 
>> Between August 9th and 10th, something appears to have changed on the
>> slaves, which is meaning that the lookup of the name is now returning an
>> IP.  This is causing the Java test to fail. I've investigated by
>> introducing shell commands into the job, and can see evidence of the same
>> problem at the UNIX level.  I am certainly seeing this on slaves ubuntu4
>> through ubuntu6.
>> 
>> 
>> $ host hg3sgaaw4lgihjs
>> hg3sgaaw4lgihjs has address 198.105.244.11
>> hg3sgaaw4lgihjs has address 198.105.254.11
>> Host hg3sgaaw4lgihjs not found: 3(NXDOMAIN)
>> 
>> $ host hg3sgaaw4lgihjs2
>> hg3sgaaw4lgihjs2 has address 198.105.244.11
>> hg3sgaaw4lgihjs2 has address 198.105.254.11
>> Host hg3sgaaw4lgihjs2 not found: 3(NXDOMAIN)
>> 
>> 
>> I considered changing the test to use a RFC-2606 Reserved Top Level DNS
>> Names  hg3sgaaw4lgihjs.invalid but I notice that it too is resolving to
>> 198.105.244.11 too.  The fact that an .invalid address is resolving makes
>> me suspect there is an environmental problem at the root cause.
>> 
>> host hg3sgaaw4lgihjs.invalid
>> hg3sgaaw4lgihjs.invalid has address 198.105.244.11
>> hg3sgaaw4lgihjs.invalid has address 198.105.254.11
>> Host hg3sgaaw4lgihjs.invalid not found: 3(NXDOMAIN)
>> 
>> Is there a name resolution issue affecting these hosts?
>> 
>> Example job affected by the issue:
>> 
>> https://builds.apache.org/view/M-R/view/Qpid/job/Qpid-Java-Java-Test-JDK1.8/
>> 
>> Kind regards, Keith Wall.



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