[libvirt-users] Network hooks for ethernet interfaces

[Ruben Kerkhof]

On Tue, Apr 9, 2019 at 5:10 PM Michal Privoznik <mprivozn at redhat.com> wrote:
>
> On 4/9/19 4:38 PM, Ruben Kerkhof wrote:
> > Hi all,
> >
> > I have a hook script, /etc/libvirt/hooks/network, that doesn't seem to
> > be called when I attach an interface with type 'ethernet' with this
> > xml snippet:
> >
> > <interface type='ethernet'>
> >      <model type="virtio"/>
> >      <source>
> >          <ip address="10.100.0.1" prefix="24" peer="10.100.0.10"/>
> >      </source>
> > </interface>
> >
> > https://www.libvirt.org/hooks.html#intro says
> > "A network is started or stopped or an interface is plugged/unplugged
> > to/from the network (since 1.2.2)".
> >
> > While I don't have a network defined in xml, I'd expect this to work
> > just as well for 'ethernet' type interfaces. Am I wrong?
>
>
> Hotplugging an 'ethernet' type of interface doesn't really relate to any
> libvirt network. Hence libvirt doesn't call 'network' hook script. If
> you'd continue reading you'll see what is the 'network' hook fed with
> (on stdin): info on domain in question AND network where the event
> ocurred. But there is no network, is it?

No not in the libvirt sense there isn't, you're right.
>
> But maybe you can work around this by waiting for
> DEVICE_ADDED/DEVICE_REMOVED events? What is it that you're trying to solve?

I'd like to enable proxy_arp on the interface among other things.
I can easily do this from the same script that adds the interface
though, so I have a workaround, but a hook that triggers on all
interface events felt cleaner.

>
> Michal

Kind regards,

Ruben