OpenStack: Can't create instances using KVM on host.

I have a Dockerize installation from Devstack all-in-one. The goal for me is to connect to the host's KVM and create instances there. Nova was configured as follows for this purpose. *# /etc/nova/nova.conf# /etc/nova/nova-cpu.conf# [libvirt]# connection_uri = qemu+ssh://root@172.10.1.1/system <http://root@172.10.1.1/system>* When I try to build the instance, I get the following error. *# Build of instance cdd6f8b4-6dcf-4a43-b96a-fb6166b20235 aborted: Failed to allocate the network(s), not rescheduling.* ovs-vsctl commands cause the error. What is the problem? Does this need to be done differently?