[libvirt-users] Error with OpenStack starting an instance

[Laine Stump]

On 08/03/2016 10:25 AM, Silvia Fichera wrote:
> Hi all,
> I have installed OpenStack using devstack, when I try to launch an 
> instance I have an error related to libvirt:
> libvirtError: Cannot get interface MTU on 'br-int'
>
> and this don't allow to create a VM.
> Any hint to solve it?

This message is logged when libvirt tries to call ioctl(SIOCGIFMTU) for 
the device "br-int". Not having any further information about your 
networking setup, I can't say why that might be, but this should give 
you a starting point to investigate.