[Libguestfs] virt-builder fail with "bridge ‘virbr0’ not found" (fixed by LIBGUESTFS_BACKEND=direct ?!)

[Nir Soffer]

On Wed, Oct 10, 2018 at 10:18 AM Pino Toscano <ptoscano at redhat.com> wrote:

> On Tuesday, 9 October 2018 20:16:04 CEST Nir Soffer wrote:
> > I'm trying to build fedora-27 image for testing uploads:
> >
> > $ virt-builder fedora-27 -o /var/tmp/fedora-27.img
> > ...
> > [  25.2] Opening the new disk
> > virt-builder: error: libguestfs error: bridge ‘virbr0’ not found.  Try
> > running:
> >
> >   brctl show
> >
> > to get a list of bridges on the host, and then selecting the
> > bridge you wish the appliance network to connect to using:
> >
> >   export _SETTINGS=network_bridge=<bridge name>
>
> The libvirt backend uses a network bridge on the host to setup the
> networking in the guest, which is enabled by default in virt-builder.
>

OK, now it is clear why bypassing libvirt avoids this issue.

So maybe I'm missing some libvirt package required for creating the
bridge?

libvirt is installed by vdsm, which requires:
libvirt-client
libvirt-daemon-config-nwfilter
libvirt-daemon-kvm
libvirt-lock-sanlock
libvirt-python


>
> > I don't want to add bridges to my new fresh oVirt test host, and
> > remember that this used to work previously without the bridge.
>
> "used to work" which version with?


What was available in Fedora 28 2-3 month ago. The vm used for
running this was lost, so I don't have more specific info.


> And which version are you using now?
>

$ rpm -q libguestfs-tools-c
libguestfs-tools-c-1.38.4-1.fc28.x86_64

 Nir
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