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Re: Improvement of headless server upgrades

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On Tue, Mar 04, 2025 at 08:39:43PM -0500, Helmut K. C. Tessarek wrote:
> This is my first mail in a Debian mailing list and I hope I've chosen the
> correct one. There are way too many lists thus please direct me to the
> correct one, in case I messed up.

As the matter is intersecting multiple packages, it isn't the worst
choice.

> In the last few days I ran into a serious issue when upgrading to newer
> releases on 3 headless servers: the network connection went dead.
> In the first situation the interface name changed from eth0 to end0 and
> after the reboot my adapter got a link-local address.

I am surprised to see this happen. Back in older times, interfaces used
to be named like eth0, but that should not be happening since quite a
number of stable releases. Those old systems that still use eth0 today
tend to do it due to a file /etc/udev/rules.d/70-persistent-net.rules.
Does that exist and list your interface on the affected system? If not,
can you try figuring out why it was still named eth0 before upgrading?

In principle, I expect that this is an unusual circumstance and
therefore do not think it is worth mitigating.

> In the second situation dhcpcd was replaced by Network Manager and once
> again the network was dead.

Can you try figuring out what dependency caused Network Manager to be
installed? Your apt or dpkg logs may be helpful here.

> Both network "outages" could have been prevented by adding a note at the end
> of the dist-upgrade output.

There are two difficulties in this proposal. One is finding a
responsible package for printing this note and the other is properly
detecting the changed network interface name before doing the reboot
that actually changes it.

As a result of these, I suggest investing time into making the described
situations less likely rather than printing a warning.

Helmut

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Improvement of headless server upgrades "Helmut K. C. Tessarek" <tessarek@evermeet.cx> - 2025-03-05 03:40 +0100
  Re: Improvement of headless server upgrades Fabio Fantoni <fantonifabio@tiscali.it> - 2025-03-05 10:30 +0100
  Re: Improvement of headless server upgrades Marc Haber <mh+debian-devel@zugschlus.de> - 2025-03-05 16:10 +0100
    Re: Improvement of headless server upgrades Michael Banck <mbanck@debian.org> - 2025-03-05 16:20 +0100
      Re: Improvement of headless server upgrades Bjørn Mork <bjorn@mork.no> - 2025-03-05 17:50 +0100
        Re: Improvement of headless server upgrades Matthias Urlichs <matthias@urlichs.de> - 2025-03-05 19:30 +0100
          Re: Improvement of headless server upgrades Marc Haber <mh+debian-devel@zugschlus.de> - 2025-03-05 20:40 +0100
            Re: Improvement of headless server upgrades Soren Stoutner <soren@debian.org> - 2025-03-05 21:00 +0100
          Re: Improvement of headless server upgrades "Helmut K. C. Tessarek" <tessarek@evermeet.cx> - 2025-03-05 20:40 +0100
          Re: Improvement of headless server upgrades Bjørn Mork <bjorn@mork.no> - 2025-03-05 21:10 +0100
            Re: Improvement of headless server upgrades Marc Haber <mh+debian-devel@zugschlus.de> - 2025-03-05 21:40 +0100
              Re: Improvement of headless server upgrades Matthias Urlichs <matthias@urlichs.de> - 2025-03-05 22:30 +0100
                Re: Improvement of headless server upgrades Marc Haber <mh+debian-devel@zugschlus.de> - 2025-03-06 09:00 +0100
            Re: Improvement of headless server upgrades "Helmut K. C. Tessarek" <tessarek@evermeet.cx> - 2025-03-05 21:40 +0100
      Re: Improvement of headless server upgrades "Helmut K. C. Tessarek" <tessarek@evermeet.cx> - 2025-03-05 20:40 +0100
        Re: Improvement of headless server upgrades Marc Haber <mh+debian-devel@zugschlus.de> - 2025-03-06 10:10 +0100
    Re: Improvement of headless server upgrades Marc Haber <mh+debian-devel@zugschlus.de> - 2025-03-06 15:50 +0100
    Re: Improvement of headless server upgrades Richard Lewis <richard.lewis.debian@googlemail.com> - 2025-03-07 01:50 +0100
  Re: Improvement of headless server upgrades Helmut Grohne <helmut@subdivi.de> - 2025-03-06 06:50 +0100
    Re: Improvement of headless server upgrades "Helmut K. C. Tessarek" <tessarek@evermeet.cx> - 2025-03-07 00:10 +0100
  Re: Improvement of headless server upgrades Holger Levsen <holger@layer-acht.org> - 2025-03-06 09:50 +0100
    Re: Improvement of headless server upgrades Fabio Fantoni <fantonifabio@tiscali.it> - 2025-03-06 11:30 +0100
    Re: Improvement of headless server upgrades Wookey <wookey@wookware.org> - 2025-03-06 15:20 +0100
      Re: Improvement of headless server upgrades Andrey Rakhmatullin <wrar@debian.org> - 2025-03-06 17:40 +0100
      Re: Improvement of headless server upgrades Bjørn Mork <bjorn@mork.no> - 2025-03-06 18:00 +0100
      Re: Improvement of headless server upgrades "Helmut K. C. Tessarek" <tessarek@evermeet.cx> - 2025-03-07 00:00 +0100
        Re: Improvement of headless server upgrades "Helmut K. C. Tessarek" <tessarek@evermeet.cx> - 2025-03-07 00:20 +0100

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