nova/network/quantum/manager.py : update_dhcp() calls restart_dhcp() which checks and starts dnsmasq if needed.
NetworkManager calls self._setup_network_on_host from init_host
For FlatDHCPManager and VlanManager update_dhcp() is called from _setup_network_on_host
But QuantumManager does not call update_dhcp() during init_host() - hence the problem.
nova/network/ quantum/ manager. py : update_dhcp() calls restart_dhcp() which checks and starts dnsmasq if needed.
NetworkManager calls self._setup_ network_ on_host from init_host network_ on_host
For FlatDHCPManager and VlanManager update_dhcp() is called from _setup_
But QuantumManager does not call update_dhcp() during init_host() - hence the problem.