[libvirt] Libvirt, nwfilter, openvswitch

[Jan De Landtsheer]

Hi Gang, Daniel

Added a little  Script, linked to
/etc/libvirt/qemu<https://github.com/PurePeople/archipv6/blob/master/qemu.py>
to
be able to add some flows to my openvswitch. Script ran to my liking
(IANAP), and then adding it to /etc/libvirt/hooks... Hang.
Only after a lot of looking around (in the last lines of the Hooks page),
aha! Don't do this! don't call libvirt in your hook script...
:-(

What I want: the vnets and their mac addresses for the started VM,
otherwise there wouldn't be a need for any of this script, but yeah...
nope...
Is there _any_ way I can get the vnet list for the star{t,ted) vm with the
corresponding mac address of the tap interface ?
I figure that the only way to know the mac addr of the VM would be to query
libvirt, so I'm at a loss here.

Note, of course, this script ran perfectly from command line, until it went
into /etc/libvirt/hooks/qemu ;-) da-mn!
Can this eventually be called from somewhere else?
Since libvirt has everything figured out in the 'start' stage, can't I
receive more than just 4 parameters ?

Any ideas?

;-)

Greetz

Jan


On Wed, Nov 13, 2013 at 7:39 AM, Vasiliy Tolstov <v.tolstov at selfip.ru>wrote:

> 2013/11/12 Laine Stump <laine at laine.org>:
> > Because it's terribly inefficient.
> >
> > You may, on the other hand, view it as "clever", because it is able to
> > work around deficiencies in the individual components to make something
> > that works at all. It certainly is true, though, that a lot of cycles
> > are being wasted on each packet's trip through all that network linkage,
> > and it would sure be nice if that waste could be avoided.
>
>
> May be the best way to create minimal daemon that able to talk via rpc
> with libvirt and have backends for nwfilter and openflow. Each rule it
> translate to needed rules..
>
> --
> Vasiliy Tolstov,
> e-mail: v.tolstov at selfip.ru
> jabber: vase at selfip.ru
>
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