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Re: upgrade debian + postfix/dovecot

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Thanks Andy!

I did get them from Debian sources, so I should be good.

Per your advice, I will go through and read about changes, and see what 
I need to be mindful of. Of course, I will backup everything first. =)

Thanks for clarifying the part about remove "non-debian source" 
software, which I don't think I have anything (of value), that doesn't 
come directly from Debian source repos =)

I like to keep things simple. I guess get started with the backup =)

Cheers.

On 26/12/2024 20:11, Andy Smith wrote:
> Hi,
>
> On Thu, Dec 26, 2024 at 07:39:23PM +0100, Thomas Anderson wrote:
>> I have been delayed with upgrading my debian distro, and want to upgrade to
>> 12. According to the documentation, I should remove all non-debian
>> applications first, before upgrading. Almost all the applications I use are
>> non-debian (postfix, dovecot, apache, mysql, etc..), so it almost makes it
>> seem like I should just do a full new install??
> The advice to "remove all non-Debian applications first" means to remove
> things installed from non-Debian package repositories. It seems unlikely
> that you have installed postfix, dovecot, apache, mysql, etc. from
> outside of Debian, i.e. from third party repositories. If you have
> installed them from the main Debian archive then that's fine.
>
>> Thinking out loud, I guess best bet would be to backup the systems most
>> important to me (outside of clonezilla), and just re-apply the configuration
>> files after a re-install of the required software systems?
> Do you really need to remove any software? Most people don't need to.
>
>> "What is the difference between upgrading my system (after remove all
>> non-debian apps) and simply doing a brand new, clean install??"
>>
>> "Is one better than the other??
> If you have good backups of your configuration and user data and a good
> understanding of what will change with the new versions of all your apps
> then a reinstall can often make for a shorter downtime than an in-place
> upgrade. Taken to the extreme, one can automate a reinstall a bit easier
> than one can automate an upgrade, and have it done in a matter of
> minutes.
>
> The hardest part of any upgrade is when the new versions of the packages
> are configured in different ways. You can go into it blind either with a
> reinstall or an upgrade and who knows how long it will take for you to
> work out what has changed, how it changed and how to make it work again.
>
> Sometimes when the changes are extensive (like a whole restructuring of
> config layout for example) then trying to change in place what you had
> before to what is now required can be rather confusing, while looking
> what the new default is and adjusting that to be how you want may be
> easier.
>
> It is still largely a matter of taste and I expect you will get replies
> saying they have never reinstalled since Debian 0.90 and never had a
> problem.
>
> I upgrade in place a lot, sometimes even when I know it will probably
> be faster/simpler to reinstall.
>
> Thanks,
> Andy
>

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Thread

upgrade debian + postfix/dovecot Thomas Anderson <thomas.anderson@little-beak.com> - 2024-12-26 19:50 +0100
  Re: upgrade debian + postfix/dovecot Andy Smith <andy@strugglers.net> - 2024-12-26 20:20 +0100
    Re: upgrade debian + postfix/dovecot Thomas Anderson <thomas.anderson@little-beak.com> - 2024-12-26 20:50 +0100
      Re: upgrade debian + postfix/dovecot Max Nikulin <manikulin@gmail.com> - 2024-12-27 03:10 +0100
  Re: upgrade debian + postfix/dovecot John Hasler <john@sugarbit.com> - 2024-12-26 21:00 +0100
    Re: upgrade debian + postfix/dovecot Henrik Ahlgren <pablo@seestieto.com> - 2024-12-27 12:10 +0100

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