Hey there,

I'm wondering if anyone else has come up against this issue.

I'm running up the latest jenkins container (2.32.2) on top of:

   - Docker 1.13.0
   - CoreOS 1313.0.0
   - Kubernetes v1.5.3
   - Vagrant 1.9.1
   
And jenkins complains on start up that it can't find the updates mirror:

> java.net.UnknownHostException: mirrors.jenkins-ci.org


Fair enough. But if I try and resolve the host in that same container I can 
resolve back to an IP, even curling that host brings back the site:

$ kubectl exec -it jenkins-pwqwq curl http://mirrors.jenkins-ci.org | head
<html>
<!--
  MANAGED BY PUPPET. DO NOT MODIFY.


  This file generated from index.erb. Edit that file and do


    erb < index.erb > index.html
-->
<head>
  <title>Jenkins mirrors</title>

Additionally, if I run a jenkins job with a simple command to curl that 
host (it's a single master jenkins setup), I get content back.

Anyone got any pointers? I've blown the stack away and recreated a number 
of times, no resolution. I feel like jenkins thinks the DNS host is 
something it is not.


Regards,
Shaun

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