[kwlug-disc] Networking on libvirt vs. VirtualBox

[Khalid Baheyeldin]

After defining br0 in the host's network, if I specify bridge=br0, it works
fine, but only with sudo, which is annoying.

VirtualBox did not need any host changes, and did not require sudo.

Is there a way to do this on kvm/libvirt?


On Fri, Aug 1, 2014 at 3:03 PM, William Park <opengeometry at yahoo.ca> wrote:

> On Fri, Aug 01, 2014 at 12:27:21PM -0400, Khalid Baheyeldin wrote:
> > On VirtualBox, I was able as non-root to get bridged networking by doing:
> >
> > vboxmanage createvm --name p1 --ostype Ubuntu_64 --register
> > vboxmanage modifyvm p1  ... --nic1 bridged --bridgeadapter1 eth0
> --nictype1
> > 82543GC
> >
> > And that provided me functional two-way networking, assigning a new IP
> > address from the router, and allows incoming and outgoing networking
> > transparently.
> >
> > On KVM, I did:
> >
> > virt-install --name p1 --ram 512 --disk path=~/p.img,size=2 --cdrom
> > ./media/precise64/ubuntu-12.04.4-server-amd64.iso --boot cdrom --network
> > bridge=eth0
> >
> > That would not work because it requires root (VirtualBox worked without
> > sudo).
> >
> > So, I need to use sudo before that command. But when I do this, I get the
> > error:
> >
> > ERROR    Unable to add bridge eth0 port vnet0: Operation not supported
> >
> > Googling for that error suggests that this command should fix it:
> >
> > virsh iface-bridge eth0 br0
> >
> > But it does not work, with or without sudo, with the following error:
> >
> > error: failed to get interface 'eth0'
> > error: this function is not supported by the connection driver:
> > virInterfaceLookupByName
> >
> > So, the question is, using libvirt and kvm, how does one get bridged
> > networking to work?
>
> From memory, QEMU simply adds its tap interface to existing bridge.  I
> had to setup bridge and add wlan0 (my wireless connection) to it.  Then,
> the virtual machine got its IP from the wireless router.
> --
> William
>
>
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-- 
Khalid M. Baheyeldin
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