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Improvement of headless server upgrades

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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.

I would like to make a suggestion for release upgrades. It should not be 
a huge effort to implement and I can work with someone to make this happen.

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

Please don't get me wrong, I am not against keeping up with the times 
and use new technology. Far from it.
But in both cases I had to connect my headless machines to a monitor and 
keyboard and fix the network issues. Usually this is not a problem, but 
sometimes it might be impossible.
In both cases I did not even know that these things would happen. The 
dist-upgrade made the changes without my input and I was left in the 
dark. Iamgine my surprise when I couldn't connect to my boxes anymore.

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

e.g. something like the following (monospace font required for the 
"Attention" text):

     _  _____ _____ _____ _   _ _____ ___ ___  _   _
    / \|_   _|_   _| ____| \ | |_   _|_ _/ _ \| \ | |
   / _ \ | |   | | |  _| |  \| | | |  | | | | |  \| |
  / ___ \| |   | | | |___| |\  | | |  | | |_| | |\  |
/_/   \_\_|   |_| |_____|_| \_| |_| |___\___/|_| \_|

Network interface name changed: please update config files before reboot.

     _  _____ _____ _____ _   _ _____ ___ ___  _   _
    / \|_   _|_   _| ____| \ | |_   _|_ _/ _ \| \ | |
   / _ \ | |   | | |  _| |  \| | | |  | | | | |  \| |
  / ___ \| |   | | | |___| |\  | | |  | | |_| | |\  |
/_/   \_\_|   |_| |_____|_| \_| |_| |___\___/|_| \_|

Network subsystem changed: please add a system connection before reboot.

Is this something that makes sense? Often you have a remote console like 
an iLO or whatever cloud systems provide. But in some cases there is 
nothing. No console, no monitor, no keyboard. Only a power and a network 
cable.

Cheers,
   K. C.

P.S.: I go by KC, trying to avoid the Spaceballs Dark Helmet mixup.


-- 
regards Helmut K. C. Tessarek              KeyID 0x172380A011EF4944
Key fingerprint = 8A55 70C1 BD85 D34E ADBC 386C 1723 80A0 11EF 4944

/*
    Thou shalt not follow the NULL pointer for chaos and madness
    await thee at its end.
*/

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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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