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]> 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
>
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