Some times, when you are doing a live migration , it will ended up with the following error in the nova-compute.log of hypervisor. The reason for this as follows. The Interface was removed by the user, but LIBVIRT doesnt acknowledged about this. But nova did. So, when nova initiates a live migration, libvirt is looking for this interface, which actually doesnt exists.
virsh domiflist
| Interface | Type | Source | Model | MAC |
|---|---|---|---|---|
| tap29b1bcde-c7 | bridge | qbr29b1bcde-c7 | virtio | fa:16:3e:79:06:2a |
| tap887baa4b-2e | bridge | qbr887baa4b-2e | virtio | fa:16:3e:d8:e9:db |
At the same time
nova interface-list 41d0b857-82a4-495b-9a91-b62ec8a879c8
| Port State | Port ID | Net ID | IP addresses | MAC Addr |
|---|---|---|---|---|
| ACTIVE | 3de64520-f085-4b17-ad5e-5114a6bcf219 | 4f47a8bc-5334-47b8-adcc-49d8f0b6f13d | 10.10.10.3 | 02:3d:e6:45:20:f0 |
The interface tap29b1bcde-c7 is not exist. During the live-migration, libvirt looking for the interface and could not find. He reports to nova that, he could not find the interface and aborting live-migration. To solve this, we need to remove the not used interface. Use the following command to do this.
virsh detach-interface --domain instance-0000bab1 --type bridge --mac fa:16:3e:79:06:2a --config --live
Make sure that, interface Doesnt exists and run the live-migration. It will be succeeded.