Nova creates an invalid ethernet/bridge interface definition in virsh xml

Solution Verified - Updated -

Issue

When Nova instantiates a new VM, it fails with the following message (nova-compute.log):

2017-01-19 15:37:22.973 15495 ERROR nova.compute.manager [req-6ab48017-bb35-4923-9260-9ca85b4b4d7a 8fbb77c82d074c0b8df119afda089c4d 
38ff70e929d94ff388e7b535fc25376a - - -] [instance: 12dd278c-db19-4e3d-a55c-da6f3ed247b8] Instance failed to spawn
...
2017-01-19 15:37:22.973 15495 ERROR nova.compute.manager [instance: 12dd278c-db19-4e3d-a55c-da6f3ed247b8]     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
2017-01-19 15:37:22.973 15495 ERROR nova.compute.manager [instance: 12dd278c-db19-4e3d-a55c-da6f3ed247b8] libvirtError: Cannot find '' in path: No such file or directory

Environment

  • Red Hat Openstack Platform 9, 10
  • Red Hat Enterprise Linux 7.3 (Kernel: 3.10.0-514.2.2.el7.x86_64), a modified kernel for Plumgrid SDN
  • Libvirt 2.0.0 (libvirt-2.0.0-10.el7_3.2.x86_64)

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