The bit from the n-cpu log:

2017-02-02 16:30:34.816 DEBUG nova.compute.manager [req-d0b3d3d8-d1d2-43de-8eec-efaa0d75b7e3 admin admin] [instance: 6e971b2d-31ff-4aa2-b737-c5
ece9d37d23] Start spawning the instance on the hypervisor. from (pid=30650) _build_and_run_instance /opt/stack/nova/nova/compute/manager.py:192
5
2017-02-02 16:30:34.816 DEBUG nova.virt.ironic.driver [req-d0b3d3d8-d1d2-43de-8eec-efaa0d75b7e3 admin admin] [instance: 6e971b2d-31ff-4aa2-b737
-c5ece9d37d23] Spawn called for instance from (pid=30650) spawn /opt/stack/nova/nova/virt/ironic/driver.py:802
2017-02-02 16:30:34.854 ERROR nova.compute.manager [req-d0b3d3d8-d1d2-43de-8eec-efaa0d75b7e3 admin admin] [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23] Instance failed to spawn
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23] Traceback (most recent call last):
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/opt/stack/nova/nova/compute/manager.py", line 2125, in _build_resources
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     yield resources
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/opt/stack/nova/nova/compute/manager.py", line 1930, in _build_and_run_instance
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     block_device_info=block_device_info)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/opt/stack/nova/nova/virt/ironic/driver.py", line 812, in spawn
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     node = self._get_node(node_uuid)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/opt/stack/nova/nova/virt/ironic/driver.py", line 160, in _get_node
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     fields=_NODE_FIELDS)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/opt/stack/nova/nova/virt/ironic/client_wrapper.py", line 148, in call
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     return self._multi_getattr(client, method)(*args, **kwargs)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/usr/local/lib/python2.7/dist-packages/ironicclient/v1/node.py", line 195, in get
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     return self._get(resource_id=node_id, fields=fields)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/usr/local/lib/python2.7/dist-packages/ironicclient/common/base.py", line 88, in _get
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     return self._list(self._path(resource_id))[0]
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/usr/local/lib/python2.7/dist-packages/ironicclient/common/base.py", line 174, in _list
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     resp, body = self.api.json_request('GET', url)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/usr/local/lib/python2.7/dist-packages/ironicclient/common/http.py", line 552, in json_request
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     resp = self._http_request(url, method, **kwargs)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/usr/local/lib/python2.7/dist-packages/ironicclient/common/http.py", line 190, in wrapper
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     return func(self, url, method, **kwargs)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]   File "/usr/local/lib/python2.7/dist-packages/ironicclient/common/http.py", line 534, in _http_request
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]     error_json.get('debuginfo'), method, url)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23] NotFound: Node 6cc8803d-4e77-4948-b653-663d8d5e52b7 could not be found. (HTTP 404)
2017-02-02 16:30:34.854 TRACE nova.compute.manager [instance: 6e971b2d-31ff-4aa2-b737-c5ece9d37d23]