Tried this with Fedora 24 and very similar config (but centos7 image) and
I'm able to ping localhost.

$ cat /etc/hosts
# Kubernetes-managed hosts file.
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
fe00::0 ip6-mcastprefix
fe00::1 ip6-allnodes
fe00::2 ip6-allrouters
172.17.0.2 centoscentos7-debug

I have net.ipv6.conf.all.disable_ipv6 = 1 set - should be possible.

Can you provide your /etc/resolv.conf from inside that image?

On Thu, Aug 11, 2016 at 11:29 AM, Ulf Lilleengen <[email protected]> wrote:

> Host:
> OS: Fedora 24
> Docker: 1.10.3
> glibc-2.23.1-8
>
> Docker image:
> Name: gordons/qdrouterd:v10 (based on Fedora 23)
> Glibc:glibc-2.22-11
>
> Nothing special in the images other than that. The issue appeared without
> any significant change other than running the latest openshift/origin image.
>
> On 08/11/2016 04:58 PM, Clayton Coleman wrote:
>
>> That is very strange.  Anything special about the container (what OS,
>> libraries, glibc version, musl)?  What version of Docker was running?
>>
>> On Wed, Aug 10, 2016 at 3:45 AM, Ulf Lilleengen <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>>     Hi,
>>
>>     We were debugging an issue yesterday where 'localhost' could not be
>>     resolved inside a container in openshift origin v1.3.0-alpha.3. I'm
>>     not sure if this is openshift or kubernetes-related, but thought I'd
>>     ask here first.
>>
>>     We have two containers running on a pod, and one container is
>>     connecting to the other using 'localhost'. This has worked fine for
>>     several months, but stopped working yesterday. We resolved the issue
>>     by using 127.0.0.1. We were also able to use the pod hostname as well.
>>
>>     I'm thinking this might be related to IPv6, given that /etc/hosts
>>     seemed to contain IPv6 records for localhost, and the other
>>     container may be listening on IPv4 only. I tried disabling it with
>>     sysctl net.ipv6.conf.all.disable_ipv6=1 to verify, but I still saw
>>     the same issue.
>>
>>     sh-4.3$ cat /etc/hosts
>>     # Kubernetes-managed hosts file.
>>     127.0.0.1       localhost
>>     ::1     localhost ip6-localhost ip6-loopback
>>     fe00::0 ip6-localnet
>>     fe00::0 ip6-mcastprefix
>>     fe00::1 ip6-allnodes
>>     fe00::2 ip6-allrouters
>>     172.17.0.6      controller-queue1-tnvav
>>
>>     --
>>     Ulf Lilleengen
>>
>>     _______________________________________________
>>     users mailing list
>>     [email protected]
>>     <mailto:[email protected]>
>>     http://lists.openshift.redhat.com/openshiftmm/listinfo/users
>>     <http://lists.openshift.redhat.com/openshiftmm/listinfo/users>
>>
>>
>>
> --
> Ulf
>
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