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Re: A small pre-fix checklist for sick Linux boxes

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>On Wed, 10 Jun 2026 00:26:46 -0000 (UTC), Lawrence
>=?iso-8859-13?q?D=FFOliveiro?= <ldo@nz.invalid> wrote:
>On Tue, 09 Jun 2026 20:28:55 GMT, TheLastSysop wrote:
>
>> uname -a
>> ip addr
>> ip route
>> systemctl --failed
>> journalctl -b -p warning..alert --no-pager | tail -100
>> df -h
>> lsblk -f
>
>Does that look as intended?
>
>> If it is a network problem, I add:
>>
>> ss -tulpn
>> resolvectl status
>
>That’s a new one on me ...
>
>Ah. Not used in Debian.
><https://www.freedesktop.org/software/systemd/man/latest/resolvectl.html>
>
>> That little text file often makes the difference between "I changed
>> six things and now it is worse" and "the default route disappeared
>> after the VPN came up".
>
>Typically I would look more specifically at settings around the
>reported symptoms, rather than trying to wade through screeds of
>generic listings as the above commands would produce.
>
>E.g. Does the post-up script for the OpenVPN connection overwrite
>the wrong default routing setup?

Fair point.  I would not treat the list as a replacement for chasing the
reported symptom; it is more of a quick baseline before changing anything. For a
VPN/routing complaint, the useful subset would be closer to:

    ip route get 1.1.1.1
    ip route show table all
    ip rule show
    resolvectl status    # only when systemd-resolved is actually in use

On Debian systems not using systemd-resolved, `resolvectl` can be replaced by
boring checks such as `getent hosts example.com` and looking at
`/etc/resolv.conf` to see who owns DNS at that moment.

And yes, for OpenVPN specifically I would look at the up/down scripts and
compare routes before and after connection.  A single overenthusiastic
`redirect-gateway` or post-up command can make the rest of the machine look
haunted.

-- 
TheLastSysop <thelastsysop@dev.null>
"I survived the great rm -rf / rehearsal and all I got was this .signature."

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A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-09 20:28 +0000
  Re: A small pre-fix checklist for sick Linux boxes "Carlos E.R." <robin_listas@es.invalid> - 2026-06-09 22:47 +0200
    Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-09 20:52 +0000
      Re: A small pre-fix checklist for sick Linux boxes not@telling.you.invalid (Computer Nerd Kev) - 2026-06-10 08:33 +1000
        Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-09 22:54 +0000
        Re: A small pre-fix checklist for sick Linux boxes Nuno Silva <nunojsilva@invalid.invalid> - 2026-06-10 09:13 +0100
          Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-10 08:50 +0000
    Re: A small pre-fix checklist for sick Linux boxes 🇵🇱Jacek Marcin Jaworski🇵🇱 <jmj@energokod.gda.pl> - 2026-06-09 23:27 +0200
      Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-09 22:07 +0000
        Re: A small pre-fix checklist for sick Linux boxes 🇵🇱Jacek Marcin Jaworski🇵🇱 <jmj@energokod.gda.pl> - 2026-06-10 02:24 +0200
          Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-10 00:26 +0000
            Re: A small pre-fix checklist for sick Linux boxes Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-10 01:06 +0000
              Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-10 01:10 +0000
  Re: A small pre-fix checklist for sick Linux boxes Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-06-10 00:26 +0000
    Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-10 00:39 +0000
  Re: A small pre-fix checklist for sick Linux boxes Nuno Silva <nunojsilva@invalid.invalid> - 2026-06-10 09:11 +0100
    Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-10 08:16 +0000
  Re: A small pre-fix checklist for sick Linux boxes c186282 <c186282@nnada.net> - 2026-06-10 04:13 -0400
    Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-10 08:17 +0000
  Re: A small pre-fix checklist for sick Linux boxes jayjwa <jayjwa@atr2.ath.cx.invalid> - 2026-06-10 10:07 -0400
    Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-10 14:10 +0000
      Re: A small pre-fix checklist for sick Linux boxes Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-06-10 19:55 +0000
        Re: A small pre-fix checklist for sick Linux boxes TheLastSysop <thelastsysop@dev.null> - 2026-06-10 20:18 +0000

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