[ovirt-users] newbee questions

Dan Kenigsberg danken at redhat.com
Mon May 12 15:39:45 UTC 2014

On Mon, May 12, 2014 at 05:12:14PM +0200, John Smith wrote:
> On Mon, May 12, 2014 at 12:49 PM, Dan Kenigsberg <danken at redhat.com> wrote:
> >
> > oVirt only supports bridge-based VM networks, and Linux
> > does not allow you to bridge a WiFi nic.
> >
> Which is why I was looking at the option of using 'macvtap' instead,
> which does allow you to use a wifi nic:
> http://libvirt.org/formatnetwork.html#examplesDirect
> http://www.libvirt.org/formatdomain.html#elementsNICSDirect

A big limitation of the macvtap approach is that it would let you
connect only a single VM to your WiFi. Is that fine by you?

> However, my current knowledge (of libvirt, etc.) is too limited to use
> those two links to create a working setup for me, so some more
> detailed and/or elaborate instructions and/or documentation would be
> appreciated.
> It seems to involve the manual creation of xml files, and then feeding
> those to virsh in order to change the configuration or something ? Is
> there a command i can feed vrish to make it dump the current
> configuration in xml, so that maybe i can start to use that as a basis
> and hack it up to see what happens ?

Yes, defining a libvirt network requires using

  virsh net-define <xmlfile>

(you may need to pass the not-so-secret vdsm at ovirt/shibboleth password
to tinker with libvirt, which is better done on non-production setup)

  virsh net-dumpxml <net-name>

could show you what's already defined, but I don't expect you to have
interesting networks as of yet.

It may not be easy, but I'd be grateful if you report here on what you
will have accomplished.

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