[libvirt-users] generate interface MAC addresses in a particular order

[Andrei Perietanu]

Hi all,

 I am using libvirt to manage VM on my system; after creating a VM (default
no NICs are present in the configuration) you can add any number of
interfaces to it (as long as they exist on the host).
To do that, I edit the configuration xlm:

      vmXml = self.domain.XMLDesc()
        root = ET.fromstring(vmXml)
        devices = root.find('./devices')

        intf = ET.SubElement(devices,'interface')
        intf.set('type', 'bridge')
        src = ET.SubElement(intf,'source')
        src.set('bridge', bIntf)
        model = ET.SubElement(intf,'model')
        model.set('type', 'e1000')

        xml = ET.tostring(root)
        self.conn.defineXML(xml)

Now the problem I have is that the MAC addresses are auto-generated and
because of this there is no way to predict which interface number the newly
added interface will map to, on the VM. Ideally, the first added interface
is mapped to eth0/0, the second one eth0/1...etc.  Since the mappings
depend on the MAC addresses I figured that is the part I need to have
control over.

Any ideas?

Thanks,
Andrei

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