[arch-general] QEMU Networking

[2QdxY4RzWzUUiLuE at potatochowder.com]

On 2022-09-02 at 18:08:42 -0500,
Doug Newgard via arch-general <arch-general at lists.archlinux.org> wrote:

> On Fri, 2 Sep 2022 17:12:35 -0400
> Dan Sommers via arch-general <arch-general at lists.archlinux.org> wrote:
> 
> > On 2022-09-02 at 10:01:15 -0400,
> > Dan Sommers via arch-general <arch-general at lists.archlinux.org> wrote:
> > 
> > > On 2022-09-02 at 09:41:21 -0400,
> > > Dan Sommers via arch-general <arch-general at lists.archlinux.org> wrote:  
> > 
> > > >     [Then I found <https://bbs.archlinux.org/viewtopic.php?id=253005>.]  
> > 
> > > FYI:  QEMU is just like drill:  it doesn't work with systemd-resolved's
> > > default resolv.conf.  When I added a nameserver line to resolv.conf, my
> > > virual machines gained internet access.  
> > 
> > FWIW:  https://gitlab.com/qemu-project/qemu/-/issues/1189
> > 
> 
> If you resolv.conf was empty, you didn't set up systemd-resolved correctly. See
> the wiki, it should be a symlink.

I set up iwd as per https://wiki.archlinux.org/title/Iwd during
installation.  There are three sentences about a DNS Manager, including
a note that "if not specified, systemd-resolved is used as the default."

I didn't set up systemd-resolved at all, which means that you are not
wrong to say that I didn't set it up correctly.  :-)

(My previous Arch system came with ConnMann and netctl out of the box,
and I switched to NetworkManager for the sake of XFCE.  I don't recall
doing anything special to set up name resolution.)

If I missed something during or shortly after installation, then this is
all on me, and I learned a few things, and I'll know better next time.

In the interest of improving Arch and perhaps saving someone else from
the running into the same situation, I went back through the the
Installation Guide and the General Recommendations.

The Installation Guide says that I can verify my internet connection
with "ping archlinux.org," which has always worked.  That's followed by
a note that, "[in] the installation image, systemd-networkd,
systemd-resolved, iwd and ModemManager are preconfigured and enabled by
default. That will not be the case for the installed system."

The only reference to DNS in the General Recommendations is about
better security.

Hindsight being 20/20, I could say that the note in the Installation
Guide told me to go back and check my network setup after the
installation.  On the other hand, that note follows the paragraph that
says that I can verify my network connection by pinging archlinux.org.

In my best Bones McCoy voice, I'm a [retired] software developer, not a
network administrator.

My recommendation would be something in the General Recommendations
about re-checking that networking (i.e., whatever you did under "Connect
to the internet" during installation) is completely and correctly set
up, even if you did choose the defaults during installation (or didn't
override those defaults if you didn't have to).

If there's a place to make this recommendation (and to justify it by
today's experience), then by all means, point me to it.

Thanks for listening (and for Arch),
Dan

-- 
I can eat glass, it does not hurt me.
Dan Sommers, http://www.tombstonezero.net/dan