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[debbugs-tracker] bug#22209: closed (name resolution failures in install

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#22209: closed (name resolution failures in installer image)
Date: Tue, 03 May 2016 20:28:02 +0000

Your message dated Tue, 03 May 2016 22:26:31 +0200
with message-id <address@hidden>
and subject line Re: bug#22209: name resolution failures in installer image
has caused the debbugs.gnu.org bug report #22209,
regarding name resolution failures in installer image
to be marked as done.

(If you believe you have received this mail in error, please contact

22209: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=22209
GNU Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- Subject: name resolution failures in installer image Date: Sat, 19 Dec 2015 09:04:41 +0100 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0
Hash: SHA256


this occurs over and over to me and I saw other people's reports on
IRC, too:

After booting the installer image, doing the ifconfig/dhclient dance,
preparing the target fs, mounting it and starting the guix system init
invocation at some point in time, though not predictably so, but
usually after a couple of minutes (about 10 or so) name resolution
will start to fail causing guix system init to fail.

killall dhclient; dhclient <your_interface_name_here>

and a subsequent invocation to guix system init will make the
installation continue and usually succeed.

On the first few occasions it seemed to me that my local network could
be at fault, but it's _almost_ reliably reproducable in qemu,
virtualbox and even on bare metal and is not limited to myself (check
the channel logs with some good search queries).

So it might be worth looking into.

The installed system does not have this problem after a reboot.


- -- 
Version: GnuPG v2


--- End Message ---
--- Begin Message --- Subject: Re: bug#22209: name resolution failures in installer image Date: Tue, 03 May 2016 22:26:31 +0200 User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
address@hidden (Ludovic Courtès) skribis:

> address@hidden (Ludovic Courtès) skribis:
>> Ricardo Wurmus <address@hidden> skribis:
> [...]
>>> Could this be related to cached resolution failures in nscd?  Have you
>>> tried restarting the nscd service?
>> That sounds likely.
>> Nscd caches negative lookups, but normally only for 20 seconds (see
>> %nscd-minimal-caches in (gnu system install)).  So if you look up
>> hydra.gnu.org before the network is set up, it’ll remember for 20s that
>> this is a lookup failure, even if you’ve set up the network in the
>> meantime.
> Commit c96ba2c disables caching of lookup failures altogether.

0.10.0 uses this fix and we haven’t heard from name resolution failures
in the installer image, so I’m closing it.


--- End Message ---

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