InstanceDeployFailure: Cannot setup network: 'NoneType' object has no attribute 'endswith'

[Daniel Kuffner]

I tried to setup havana with docker hypervisor on Centos 6.4

I followed this documentation to setup docker: http://nareshv.blogspot.de/2013/09/installing-dockerio-version-061-on.html
I pulled out all other relevant topics regarding docker out of devstack. I have started a docker repository on the same node, it works, images are available in horizon.

When I try to start a new instance with e.g. the centos or busybox docker image it will fail.
When I observe docker (docker ps) then I can see that a instance will be created and after a couple of seconds removed.

In the log file I found following:

/var/log/nova/compute.log

2013-10-27 07:56:05.221 11974 TRACE nova.compute.manager [instance: 81a76b09-9e0c-4b51-a9d1-1012de836bf0] Traceback (most recent call last):
2013-10-27 07:56:05.221 11974 TRACE nova.compute.manager [instance: 81a76b09-9e0c-4b51-a9d1-1012de836bf0] File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1405, in _spawn
2013-10-27 07:56:05.221 11974 TRACE nova.compute.manager [instance: 81a76b09-9e0c-4b51-a9d1-1012de836bf0] block_device_info)
2013-10-27 07:56:05.221 11974 TRACE nova.compute.manager [instance: 81a76b09-9e0c-4b51-a9d1-1012de836bf0] File "/usr/lib/python2.6/site-packages/nova/virt/docker/driver.py", line 314, in spawn
2013-10-27 07:56:05.221 11974 TRACE nova.compute.manager [instance: 81a76b09-9e0c-4b51-a9d1-1012de836bf0] instance_id=instance['name'])
2013-10-27 07:56:05.221 11974 TRACE nova.compute.manager [instance: 81a76b09-9e0c-4b51-a9d1-1012de836bf0] InstanceDeployFailure: Cannot setup network: 'NoneType' object has no attribute 'endswith'
2013-10-27 07:56:05.221 11974 TRACE nova.compute.manager [instance: 81a76b09-9e0c-4b51-a9d1-1012de836bf0]

Any idea what that could be? Is it a network misconfiguration?