Openstack报错：分配网络失败，不重新调度

Openstack nova-compute报错：

2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [req-c8cdadc1-292c-4e48-a0e4-5cbec9bd1874 e5029b459c3d4c36bb02570dca7ece7a b6eb86a5853b45f98e89c69a2136f5ff - default default] [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0] Failed to allocate network(s): VirtualInterfaceCreateException: \u865a\u62df\u63a5\u53e3\u521b\u5efa\u5931\u8d25
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0] Traceback (most recent call last):
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2032, in _build_and_run_instance
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]     block_device_info=block_device_info)
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 3107, in spawn
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]     destroy_disks_on_failure=True)
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5609, in _create_domain_and_network
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]     raise exception.VirtualInterfaceCreateException()
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0] VirtualInterfaceCreateException: \u865a\u62df\u63a5\u53e3\u521b\u5efa\u5931\u8d25
2019-04-04 16:14:28.788 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]
2019-04-04 16:14:28.792 5468 ERROR nova.compute.manager [req-c8cdadc1-292c-4e48-a0e4-5cbec9bd1874 e5029b459c3d4c36bb02570dca7ece7a b6eb86a5853b45f98e89c69a2136f5ff - default default] [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0] 实例04931b88-3618-4c36-b49a-2248a9cf5fd0的构建已中止：分配网络失败，不重新调度。: BuildAbortException: \u5b9e\u4f8b04931b88-3618-4c36-b49a-2248a9cf5fd0\u7684\u6784\u5efa\u5df2\u4e2d\u6b62\uff1a\u5206\u914d\u7f51\u7edc\u5931\u8d25\uff0c\u4e0d\u91cd\u65b0\u8c03\u5ea6\u3002
2019-04-04 16:14:28.792 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0] Traceback (most recent call last):
2019-04-04 16:14:28.792 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1841, in _do_build_and_run_instance
2019-04-04 16:14:28.792 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]     filter_properties, request_spec)
2019-04-04 16:14:28.792 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2092, in _build_and_run_instance
2019-04-04 16:14:28.792 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]     reason=msg)
2019-04-04 16:14:28.792 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0] BuildAbortException: \u5b9e\u4f8b04931b88-3618-4c36-b49a-2248a9cf5fd0\u7684\u6784\u5efa\u5df2\u4e2d\u6b62\uff1a\u5206\u914d\u7f51\u7edc\u5931\u8d25\uff0c\u4e0d\u91cd\u65b0\u8c03\u5ea6\u3002
2019-04-04 16:14:28.792 5468 ERROR nova.compute.manager [instance: 04931b88-3618-4c36-b49a-2248a9cf5fd0]

以上原因是由于控制节点和结算节点的Overlay网络没有连通。