Issue

# systemctl status openstack-nova-compute
openstack-nova-compute.service - OpenStack Nova Compute Server
   Loaded: loaded (/usr/lib/systemd/system/openstack-nova-compute.service; enabled)
   Active: failed (Result: start-limit) since Fri 2015-03-20 18:35:04 EDT; 2 days ago
  Process: 26633 ExecStart=/usr/bin/nova-compute (code=exited, status=0/SUCCESS)
 Main PID: 26633 (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/openstack-nova-compute.service

Mar 20 18:35:04 abc systemd[1]: openstack-nova-compute.service holdoff time over, scheduling restart.
Mar 20 18:35:04 abc systemd[1]: Stopping OpenStack Nova Compute Server...
Mar 20 18:35:04 abc systemd[1]: Starting OpenStack Nova Compute Server...
Mar 20 18:35:04 abc systemd[1]: openstack-nova-compute.service start request repeated too quickly, refusing to start.
Mar 20 18:35:04 abc systemd[1]: Failed to start OpenStack Nova Compute Server.
Mar 20 18:35:04 abc systemd[1]: Unit openstack-nova-compute.service entered failed state.
[root@abc ~]# tail -35 /var/log/nova/nova-compute.log
2015-03-20 18:35:03.480 26599 TRACE nova.openstack.common.threadgroup NovaException: Unexpected vif_type=binding_failed
2015-03-20 18:35:03.480 26599 TRACE nova.openstack.common.threadgroup 
2015-03-20 18:35:03.981 26633 INFO nova.openstack.common.periodic_task [-] Skipping periodic task _periodic_update_dns because its interval is negative
2015-03-20 18:35:04.024 26633 INFO nova.virt.driver [-] Loading compute driver 'nova.virt.libvirt.LibvirtDriver'
2015-03-20 18:35:04.049 26633 INFO oslo.messaging._drivers.impl_rabbit [-] Connected to AMQP server on 10.25.193.240:5672
2015-03-20 18:35:04.059 26633 INFO oslo.messaging._drivers.impl_rabbit [-] Connected to AMQP server on 10.25.193.240:5672
2015-03-20 18:35:04.079 26633 AUDIT nova.service [-] Starting compute node (version 2014.1.3-9.el7ost)
2015-03-20 18:35:04.208 26633 ERROR nova.openstack.common.threadgroup [-] Unexpected vif_type=binding_failed
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup Traceback (most recent call last):
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/threadgroup.py", line 117, in wait
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     x.wait()
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/threadgroup.py", line 49, in wait
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     return self.thread.wait()
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 168, in wait
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     return self._exit_event.wait()
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 116, in wait
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     return hubs.get_hub().switch()
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 187, in switch
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     return self.greenlet.switch()
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 194, in main
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     result = function(*args, **kwargs)
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/service.py", line 486, in run_service
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     service.start()
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/service.py", line 163, in start
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     self.manager.init_host()
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1050, in init_host
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     self._init_instance(context, instance)
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 909, in _init_instance
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     self.driver.plug_vifs(instance, net_info)
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 868, in plug_vifs
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     self.vif_driver.plug(instance, vif)
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/vif.py", line 616, in plug
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup     _("Unexpected vif_type=%s") % vif_type)
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup NovaException: Unexpected vif_type=binding_failed
2015-03-20 18:35:04.208 26633 TRACE nova.openstack.common.threadgroup