libvirt users - Apr 2019 - Re: Network hooks for ethernet interfaces

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?

Kind regards,

Ruben Kerkhof

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?

But maybe you can work around this by waiting for 
DEVICE_ADDED/DEVICE_REMOVED events? What is it that you're trying to solve?

Michal

On Tue, Apr 9, 2019 at 5:10 PM Michal Privoznik <mprivozn@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