Re: Fedora 33 System-Wide Change proposal: systemd-resolved

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On Mi, 15.04.20 15:50, Florian Weimer (fweimer@xxxxxxxxxx) wrote:

> * Lennart Poettering:
>
> > 1. If /etc/resolv.conf is a regular file, resolved will *consume* it
> >    for DNS configuration, and never change it or modify it or replace
> >    it. If this mode is selected arbitrary other programs that do DNS
> >    will talk directly to the provided DNS servers, and resolved is out
> >    of the loop.
>
> > In mode #1 resolved neither manages /etc/resolv.conf nor inserts
> > itself into DNS resolution in any way.
>
> What will nss_resolve do in this case?  Nothing?

The nss_resolve module is just a wrapper around resolved's bus
API. And the bus API uses resolved's own DNS resolution code. And
resolved is smart enough to automatically become a *consumer* of
/etc/nsswitch.conf (instead of a *manager* of it) if it is a regular
file instead of a symlink to resolved's own files in /run.

> Does this mean we need both resolve and dns in nsswitch.conf?

Yeah, that's the idea. resolve takes control if resolved runs, and
otherwise we fall back to classic nss-dns.

Lennart

--
Lennart Poettering, Berlin
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