GNU bug report logs - #74943
sshd: no hostkeys available -- exiting

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Christopher Baines <mail <at> cbaines.net>
To: bug-guix <at> gnu.org
Subject: sshd: no hostkeys available -- exiting
Date: Wed, 18 Dec 2024 12:12:41 +0000

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I'm having trouble with ssh after reconfiguring, in /var/log/messages I
see an error regarding hostkeys. The files seem to be there though, I've
tried regenerating the keys but that made no difference.

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Message #8 received at 74943 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Christopher Baines <mail <at> cbaines.net>
Cc: 74943 <at> debbugs.gnu.org
Subject: Re: bug#74943: sshd: no hostkeys available -- exiting
Date: Tue, 28 Jan 2025 11:00:39 +0100

Hello,

Christopher Baines <mail <at> cbaines.net> skribis:

> I'm having trouble with ssh after reconfiguring, in /var/log/messages I
> see an error regarding hostkeys. The files seem to be there though, I've
> tried regenerating the keys but that made no difference.

Could you provide more info, such as the relevant excerpt of
/var/log/messages and the config?

Thanks,
Ludo’.

Message #11 received at 74943 <at> debbugs.gnu.org (full text, mbox):

From: Christopher Baines <mail <at> cbaines.net>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 74943 <at> debbugs.gnu.org
Subject: Re: bug#74943: sshd: no hostkeys available -- exiting
Date: Tue, 28 Jan 2025 10:10:47 +0000

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Ludovic Courtès <ludo <at> gnu.org> writes:

> Hello,
>
> Christopher Baines <mail <at> cbaines.net> skribis:
>
>> I'm having trouble with ssh after reconfiguring, in /var/log/messages I
>> see an error regarding hostkeys. The files seem to be there though, I've
>> tried regenerating the keys but that made no difference.
>
> Could you provide more info, such as the relevant excerpt of
> /var/log/messages and the config?

I can't quite remember the exact situation, but I think this turned out
to be connected with the Patchwork service not being compatible with
current versions of the Shepherd, specifically it tries to use
primitive-fork while starting [1] and I'm guessing this leads to
confusing state things happening internally that break SSH.

1: https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/services/web.scm#n1903

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Message #14 received at 74943 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Christopher Baines <mail <at> cbaines.net>
Cc: 74943 <at> debbugs.gnu.org
Subject: Re: bug#74943: sshd: no hostkeys available -- exiting
Date: Tue, 28 Jan 2025 11:56:36 +0100

Hi,

Christopher Baines <mail <at> cbaines.net> skribis:

> Ludovic Courtès <ludo <at> gnu.org> writes:
>
>> Hello,
>>
>> Christopher Baines <mail <at> cbaines.net> skribis:
>>
>>> I'm having trouble with ssh after reconfiguring, in /var/log/messages I
>>> see an error regarding hostkeys. The files seem to be there though, I've
>>> tried regenerating the keys but that made no difference.
>>
>> Could you provide more info, such as the relevant excerpt of
>> /var/log/messages and the config?
>
> I can't quite remember the exact situation, but I think this turned out
> to be connected with the Patchwork service not being compatible with
> current versions of the Shepherd, specifically it tries to use
> primitive-fork while starting [1] and I'm guessing this leads to
> confusing state things happening internally that break SSH.

Oh there’s potential for breakage indeed.  As a rule of thumb, we should
never use ‘primitive-fork’ and ‘waitpid’ in Shepherd services.

In this case, I’d recommend using ‘spawn-command’:

  (spawn-command "…/patchwork-admin"
                 #:environment-variables …
                 #:user …
                 #:group …)

Ludo’.

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