Re: This is bad, was Re: Fedora 33 System-Wide Change proposal:?? systemd-resolved

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On Wed, Sep 30, 2020 at 11:50:00AM -0500, Michael Catanzaro wrote:
> On Wed, Sep 30, 2020 at 6:43 pm, Dominik 'Rathann' Mierzejewski
> <dominik@xxxxxxxxxxxxxx> wrote:
> >What if I'm using NetworkManager and dnssec-trigger? This has been
> >working very well for me for the last couple of releases and I'd hate
> >to be forced to manually reconfigure things so that it starts working
> >again.
> 
> The upgrade process is designed to do the right thing for users who
> stick with our defaults. Manual intervention is required for unusual
> cases like this. You'll need to manually disable systemd-resolved
> after upgrade, restore /etc/resolv.conf from the backup file that
> will be created during upgrade, and restart NetworkManager. That
> would look something like:
> 
> # systemctl disable systemd-resolved.service
> # systmectl stop systemd-resolved.service
> # mv /etc/resolv.conf.orig-with-nm /etc/resolv.conf
> # systemctl restart NetworkManager.service

After the latest updates, this should not necessary (though it will still work).
Instead, specify a preset (before the upgrade):

 sudo bash -c 'mkdir -p /etc/systemd/system-preset && echo "disable systemd-resolved.service" >/etc/systemd/system-preset/20-systemd-resolved-disable.preset'

This is also described in
https://fedoraproject.org/wiki/Changes/systemd-resolved#Fully_opting_out_of_systemd-resolved_use

Zbyszek
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