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Re: Resolving localhost (IPv6 issue?)



My bad. This was inside the same container, but it was one I ran manually with --net=host.

Here is from the one running in openshift:
sh-4.3$ cat /etc/resolv.conf
search enmasse.svc.cluster.local svc.cluster.local cluster.local
nameserver 192.168.1.17
options ndots:5

On 08/11/2016 07:44 PM, Clayton Coleman wrote:
Sorry, I meant resolve.conf inside of one of your containers

On Thu, Aug 11, 2016 at 1:35 PM, Ulf Lilleengen <lulf redhat com
<mailto:lulf redhat com>> wrote:

    [root strappi /]# cat /etc/resolv.conf
    # Generated by NetworkManager
    search redhat.com <http://redhat.com>
    nameserver 10.38.5.26
    nameserver 10.35.255.14
    nameserver 192.168.1.1
    # NOTE: the libc resolver may not support more than 3 nameservers.
    # The nameservers listed below may not be recognized.
    nameserver 2001:4662:afe3:0:8a1f:a1ff:fe2d:34e6

    Note that I set the disable_ipv6=1, but I didn't restart
    openshift/docker after doing it though.

    On 08/11/2016 05:48 PM, Clayton Coleman wrote:

        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.
        127.0.0.1localhost
        ::1localhost ip6-localhost ip6-loopback
        fe00::0ip6-localnet
        fe00::0ip6-mcastprefix
        fe00::1ip6-allnodes
        fe00::2ip6-allrouters
        172.17.0.2centoscentos7-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
        <lulf redhat com <mailto:lulf redhat com>
        <mailto:lulf redhat com <mailto:lulf redhat com>>> 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
        <lulf redhat com <mailto:lulf redhat com>
                <mailto:lulf redhat com <mailto:lulf redhat com>>
                <mailto:lulf redhat com <mailto:lulf redhat com>
        <mailto:lulf redhat com <mailto:lulf redhat com>>>> 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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            --
            Ulf



    --
    Ulf



--
Ulf


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