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From: Kevin Daudt <kdaudt@alpinelinux.org>
Date: Fri, 16 Jun 2023 12:40:59 +0200
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Subject: Re: IPv6 DNS in docker.io/alpine
To: caskd <caskd@redxen.eu>
Cc: ~alpine/devel@lists.alpinelinux.org
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On Fri, Jun 16, 2023 at 12:34=E2=80=AFPM caskd <caskd@redxen.eu> wrote:
>
> Hello everyone,
>
> i've been trying to pin down where the resolv.conf in the docker image is=
 coming from without success. I've been looking into submitting a request t=
o add IPv6 addresses to the default too to allow containers with IPv6 only =
connectivity to resolve without deriving a image from the base.
>
> Could you help me pin down where the build scripts/Dockerfile for these a=
re and would adding IPv6 as a fallback cause problems?
>
>

docker itself is responsible for the content of /etc/resolv.conf, so
you should fix it in docker.

You need to add the following to /etc/docker/daemon.json, and restart docke=
r:
  {
    "ipv6": true,
    "fixed-cidr-v6": "<prefix>",
  }

If I don't need a public prefix, I typically use fd80::/80 or something sim=
ilar.

Hope this helps,
Kevin