Openvswitch ports not getting recreated

[Peter Sabaini]

Due to an apparent communication issue between neutron-openvswitch-agent and openvswitch we were in a situation where we had linux veth devices set up for a given instance (eg. tapXXX, qvbXXX) but were missing corresponding ovs ports and iptables rules.

In this situation we had to manually delete veth devices and restart nova-compute and neutron-openvswitch-agent to get openvswitch ports and iptables rules recreated.

It would be more robust if neutron and openvswitch would automatically detect missing objects and synchronize their view of which devices and ports should be present

Versions:
Openstack Mitaka on Ubuntu xenial
neutron: 2:8.4.0-0ubuntu5
openvswitch-switch 2.5.2-0ubuntu0.16.04.1