[RHOSO 18] - Live Migration Fails with "address resolution failed" "Name or service not known"

Issue

• On the source EDPM Nova Compute node the following error is found for the failed live migration:

$ sudo journalctl -u edpm_nova_compute --since=today |grep -i error

0e6440ba3c5c90521aa3cc1 5b0a5d4578b8427588c91c96097677dd - - default default] [instance: 73bd335d-1112-4b3b-b25a-e3654d2185b2] Migration operation has aborted
May 20 15:47:48 compute18-node3 nova_compute[329410]: 2025-05-20 15:47:48.476 2 ERROR nova.virt.libvirt.driver [None req-048c9af3-89be-40df-a74e-e7ff1e4906eb 4db849ab40e6440ba3c5c90521aa3cc1 5b0a5d4578b8427588c91c96097677dd - - default default] [instance: 73bd335d-1112-4b3b-b25a-e3654d2185b2] Live Migration failure: operation failed: job 'migration out' failed: address resolution failed for compute18-node1:61152: Name or service not known: libvirt.libvirtError: operation failed: job 'migration out' failed: address resolution failed for compute18-node1:61152: Name or service not known
May 20 15:47:48 compute18-node3 nova_compute[329410]:     LOG.error("Live Migration failure: %s", e, instance=instance)
May 20 15:47:48 compute18-node3 nova_compute[329410]:     raise libvirtError('virDomainMigrateToURI3() failed')
May 20 15:47:48 compute18-node3 nova_compute[329410]: libvirt.libvirtError: operation failed: job 'migration out' failed: address resolution failed for compute18-node1:61152: Name or service not known