Hi Kevin,

compute log:

2015-11-27 03:17:29.480 6812 ERROR nova.compute.manager [-] [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] Instance failed to spawn
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] Traceback (most recent call last):
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 2310, in _build_resources
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     yield resources
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 2172, in _build_and_run_instance
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     block_device_info=block_device_info)
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2661, in spawn
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     block_device_info, disk_info=disk_info)
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 4485, in _create_domain_and_network
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     raise exception.VirtualInterfaceCreateException()
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] VirtualInterfaceCreateException: Virtual Interface creation failed
2015-11-27 03:17:29.480 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]
2015-11-27 03:17:29.490 6812 AUDIT nova.compute.manager [req-4de7d5b4-69c9-4e62-971c-c67ff32f418c None] [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] Terminating instance
2015-11-27 03:17:29.512 6812 WARNING nova.virt.libvirt.driver [-] [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] During wait destroy, instance disappeared.
2015-11-27 03:17:29.880 6812 ERROR nova.compute.manager [-] [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] Failed to allocate network(s)
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] Traceback (most recent call last):
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 2172, in _build_and_run_instance
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     block_device_info=block_device_info)
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2661, in spawn
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     block_device_info, disk_info=disk_info)
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 4485, in _create_domain_and_network
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     raise exception.VirtualInterfaceCreateException()
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] VirtualInterfaceCreateException: Virtual Interface creation failed
2015-11-27 03:17:29.880 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]
2015-11-27 03:17:29.895 6812 ERROR nova.compute.manager [-] [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] Build of instance 0b98dcb2-d343-4350-b65a-6615a8c45a20 aborted: Failed to allocate the network(s), not rescheduling.
2015-11-27 03:17:29.895 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] Traceback (most recent call last):
2015-11-27 03:17:29.895 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 2073, in _do_build_and_run_instance
2015-11-27 03:17:29.895 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     filter_properties)
2015-11-27 03:17:29.895 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 2207, in _build_and_run_instance
2015-11-27 03:17:29.895 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20]     reason=msg)
2015-11-27 03:17:29.895 6812 TRACE nova.compute.manager [instance: 0b98dcb2-d343-4350-b65a-6615a8c45a20] BuildAbortException: Build of instance 0b98dcb2-d343-4350-b65a-6615a8c45a20 aborted: Failed to allocate the network(s), not rescheduling