Fixes bug 983024

enable_dhcp, kill_dhcp and update_dhcp calls are sent to remote
nova-network, when a network is not associated with current host.

Change-Id: If7c7c6e58700cc171a8f56669e6455037df7f7e7

Author: Mandar Vaze

nova/network/quantum/manager.py

@@ -98,6 +98,10 @@ def init_host(self):
         networks = self.get_all_networks(context.get_admin_context())
         cidrs = []
         for net in networks:
+            # Don't update host information for network that does not
+            # belong to you
+            if net['host'] != self.host:
+                continue
             if net['gateway']:
                 LOG.debug("Initializing NAT: %s (cidr: %s, gw: %s)" % (
                     net['label'], net['cidr'], net['gateway']))
@@ -284,9 +288,20 @@ def delete_network(self, context, fixed_range, uuid):
         self.ipam.delete_subnets_by_net_id(context, net_uuid, project_id)
         # Get rid of dnsmasq
         if FLAGS.quantum_use_dhcp:
-            dev = self.driver.get_dev(net_ref)
-            if self.driver._device_exists(dev):
-                self.driver.kill_dhcp(dev)
+            if net_ref['host'] == self.host:
+                self.kill_dhcp(net_ref)
+            else:
+                topic = self.db.queue_get_for(context,
+                        FLAGS.network_topic,
+                        net_ref['host'])
+
+                rpc.call(context, topic, {'method': 'kill_dhcp',
+                        'args': {'net_ref': net_ref}})
+
+    def kill_dhcp(self, net_ref):
+        dev = self.driver.get_dev(net_ref)
+        if self.driver._device_exists(dev):
+            self.driver.kill_dhcp(dev)
 
     def allocate_for_instance(self, context, **kwargs):
         """Called by compute when it is creating a new VM.
@@ -370,8 +385,18 @@ def allocate_for_instance(self, context, **kwargs):
                                                allowed_address_pairs=pairs)
             # Set up/start the dhcp server for this network if necessary
             if FLAGS.quantum_use_dhcp:
-                self.enable_dhcp(context, network['quantum_net_id'], network,
-                    vif_rec, network['net_tenant_id'])
+                if network['host'] == self.host:
+                    self.enable_dhcp(context, network['quantum_net_id'],
+                            network, vif_rec, network['net_tenant_id'])
+                else:
+                    topic = self.db.queue_get_for(context,
+                                FLAGS.network_topic, network['host'])
+                    rpc.call(context, topic, {'method': 'enable_dhcp',
+                        'args': {'quantum_net_id': network['quantum_net_id'],
+                        'network_ref': network,
+                        'vif_rec': vif_rec,
+                        'project_id': network['net_tenant_id']}})
+
         return self.get_instance_nw_info(context, instance_id,
                                          instance['uuid'],
                                          rxtx_factor, host,
@@ -579,8 +604,17 @@ def deallocate_for_instance(self, context, **kwargs):
                                 network['uuid'], project_id, vif, instance_id)
 
             if FLAGS.quantum_use_dhcp:
-                self.update_dhcp(context, ipam_tenant_id, network,
+                if network['host'] == self.host:
+                    self.update_dhcp(context, ipam_tenant_id, network,
                                  vif, project_id)
+                else:
+                    topic = self.db.queue_get_for(context,
+                                FLAGS.network_topic, network['host'])
+                    rpc.call(context, topic, {'method': 'update_dhcp',
+                        'args': {'ipam_tenant_id': ipam_tenant_id,
+                        'network_ref': network,
+                        'vif_ref': vif,
+                        'project_id': network['project_id']}})
 
             db.virtual_interface_delete(admin_context, vif['id'])