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Date: Tue, 19 Jan 2016 18:05:43 -0800
From: perryh@pluto.rain.com (Perry Hutchison)
To: freebsd-questions@freebsd.org
Subject: Re: resolver not working in a chroot
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Matthew Seaman <matthew@freebsd.org> wrote:
> On 01/19/16 09:45, Perry Hutchison wrote:
> > The resolver is not working in a chroot (to the 10.2 memstick image,
> > with its /tmp, /var/run, and /var/tmp made writable by mounting tmpfs
> > on them):
> >   # chroot -u 0 -g 0 -G 105,0,5,20,25 /mnt ping pkg.FreeBSD.org
> >   ping: cannot resolve pkg.FreeBSD.org: Host name lookup failure
> > but it works when not in a chroot:
> >   # ping pkg.FreeBSD.org
> >   PING pkg.FreeBSD.org (96.47.72.71): 56 data bytes
> >   64 bytes from 96.47.72.71: icmp_seq=0 ttl=51 time=97.329 ms
> >   ...
> > What would cause this?
>
> You've mounted the 10.2 memstick image on /mnt?

Yes.

> Do you have a devfs mounted inside the chroot?  Try running:
>
>    # mount -t devfs devfs /mnt/dev
>
> and then try your chroot'ed command again.  Interesting to see
> if that helps.

The mount command worked -- there's now a devfs in the chroot
environment -- but it didn't help.  I still get the same error.
I also tried running "mount -t devfs devfs /dev" in the chroot
(after unmounting /mnt/dev), and that didn't help either.

There must be some difference in the lookup mechanisms between
the resolver and host(1), since host(1) works in the chroot.