Re: Sysstemd question
On Sat 12 Nov 2022 at 18:12:28 (-0500), paulf@quillandmouse.com wrote:
> On Sat, 12 Nov 2022 11:04:39 -0500 Greg Wooledge wrote:
> > On Sat, Nov 12, 2022 at 10:41:15AM -0500, paulf@quillandmouse.com
> > wrote:
> > > Folks:
> > >
> > > I've been reading up on systemd, both from Red Hat's documentation,
> > > Debian's and the man files. One thing I haven't been able to
> > > explain is why systemd has config files in /etc, /lib, /run, and
> > > /usr/lib.
> >
> > /lib and /usr/lib are the same thing, or will be the same thing in a
> > future release. Don't worry about that.
> >
> > /run is transient. It's an in-memory file system, created and
> > populated at boot time, or by running programs. It's not a place for
> > configuration.
> >
> > So really you're looking at /etc vs. /usr/lib.
> >
> > /usr/lib contains the defaults created by the Debian maintainers or
> > the upstream authors. When you install a new package that has a
> > systemd unit file, that's where it'll go.
> >
> > /etc contains the overrides and configuration elements that are unique
> > to your system. If a service is masked or disabled, it'll be done
> > here. If you install a locally built service, and write a systemd
> > unit for it, this is where you'll put it. If you override part or
> > all of a package's unit file, you do it here.
> >
>
> Thanks for this excellent explanation. I wish the folks who write docs
> would try to explain things in English instead of geek-ese. I'm a
> programmer, and I try to keep this in mind whenever I write docs. That
> said, though, the Red Hat docs for systemd are pretty good.
You might try reading the similar explanations that sometimes appear
at the start of a few systemd manpages from section 5; for example,
systemd.dnssd, systemd.link, systemd.netdev and systemd.network are
the ones installed on this system of mine.
It's also touched on in http://0pointer.de/blog/projects/three-levels-of-off
which is part of a series of blogs on systemd. Perhaps peruse
https://www.freedesktop.org/wiki/Software/systemd/ for a large number
of systemd documents and background.
Cheers,
David.
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