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Re: Improvement of headless server upgrades

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Il 05/03/2025 02:39, Helmut K. C. Tessarek ha scritto:
> 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.

Hi, when you do upgrade to a new major version you should before read 
release note for important changes, also read NEWS on packages upgrade 
(that contain important changes, including the one that can require 
manual changes). It is also good to test upgrade on a test server or on 
a minor one for the first time on any major version upgrade, so you can 
spot other possible unforeseen events.

These network changes are documented and well known, I have done many 
Debian server upgrades over the years and for example those network 
changes I had seen before by documenting myself and I had made sure to 
modify correctly before the upgrade and reboot to avoid unexpected 
events. Alternatively you can also modify to force the old names.

>
> 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.
>
>

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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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