[Fedora-xen] virt-manager failure

[Daniel P. Berrange]

On Tue, Sep 04, 2007 at 11:07:34PM +0100, John Lagrue wrote:
> On 04/09/07, John Lagrue <jlagrue at gmail.com> wrote:
> > On 04/09/07, Richard W.M. Jones <rjones at redhat.com> wrote:
> > > John Lagrue wrote:
> > > > TRying to create a guest using virt-manager on Fedora 7. Upon clicking
> > > > "Finish" I get this error:
> > > >
> > > > Unable to complete install '<class 'libvirt.libvirtError'>
> > > > virDomainCreateLinux() failed Failed to add tap interface 'vnet0' to
> > > > bridge 'virbr0' : No such device
> > > >
> > > > Any thoughts?
> > >
> > > What type of networking did you select?
> > >
> > > Is there any further detail in:
> > >    /root/.virt-manager/virt-manager.log
> > >    /var/log/xen/xend.log
> > >    /var/log/xen/xend-debug.log
> > >
> >
> > I selected Virtual Network, default device. There doesn't seem to be
> > anything informative in the virt-manager log file, other than the
> > traceback.
> >
> > I don't use Xen, so those logs don't exist.
> >
> > It would seem to me to be saying that the virbr0 device doesn't exist;
> > how can I check if it does?
> >
> > JDL
> >
> 
> It does indeed seem that virbr0 doesn't exist. Is there something that
> I haven't installed? I only want qemu-kvm, as Xen isn't a viable
> option for me.

virbr0 is (supposed to be) created automatically by libvirt. If it does not
exist there are a couple of things to check

# virsh net-list --all
Name                 State      Autostart 
-----------------------------------------
default              active     yes       

If that shows it active, then try restarting it with

  virsh net-destroy default
  virsh net-start default

If net-list didn't show it, then it may be deleted or not created in the
first place. You can re-create it with

  virsh net-define /usr/share/libvirt/networks/default.xml
  virsh net-autostart default
  virsh net-start default

Dan.
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