[libvirt-users] which is the config file for a vm ?

Andrea Bolognani abologna at redhat.com
Tue Mar 1 15:42:22 UTC 2016


On Tue, 2016-03-01 at 14:57 +0100, Lentes, Bernd wrote:
> Hi, 
> 
> i have a weird problem. I have a vm (KVM) which seems to run fine.
[...]
> As you see, the vm has one NIC. Its MAC-Address is: '52:54:00:37:92:03'.
> I also see that MAC when i edit the config via virsh.
> 
> But when i boot that vm, it has a nic with another MAC: '52:54:00:37:92:B2' ???

Looks like the domain configuration has been changed while it
was already running: the inactive configuration contains the
new MAC address, but the live configuration still contains the
previous value.

Example:

  $ sudo virsh dumpxml test | grep '<mac'
        <mac address='52:54:00:e9:0a:e1'/>

  $ sudo virsh dumpxml --inactive test | grep '<mac'
        <mac address='52:54:00:e9:0a:5f'/>

Destroying the domain and starting it up again should be
enough for it to pick up the new MAC address.

Cheers.


PS: You should never look at the on-disk domain XML directly as
    it's owned by the deamon; always use 'virsh edit', 'virsh
    dumpxml' etc. to inspect and modify it.
-- 
Andrea Bolognani
Software Engineer - Virtualization Team




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