Merge "Periodic update of DNS entries."

etc/nova/nova.conf.sample

@@ -920,6 +920,15 @@
 # l3_lib=nova.network.l3.LinuxNetL3
 #### (StrOpt) Indicates underlying L3 management library
 
+# update_dns_entries=false
+#### (BoolOpt) If True, when a DNS entry must be updated, it sends a fanout
+####           cast to all network hosts to update their DNS entries in multi
+####           host mode
+
+# dns_update_periodic_interval=-1
+#### (IntOpt) Number of periodic scheduler ticks to wait between runs of
+####          updates to DNS entries
+
 
 ######## defined in nova.network.quantumv2.api ########
 

nova/network/manager.py

@@ -170,6 +170,10 @@ network_opts = [
                 help='If True, when a DNS entry must be updated, it sends a '
                      'fanout cast to all network hosts to update their DNS '
                      'entries in multi host mode'),
+    cfg.IntOpt("dns_update_periodic_interval",
+               default=-1,
+               help='Number of periodic scheduler ticks to wait between '
+                    'runs of updates to DNS entries.'),
     cfg.StrOpt('dhcp_domain',
                default='novalocal',
                help='domain to use for building the hostnames'),
@@ -1946,6 +1950,15 @@ class NetworkManager(manager.SchedulerDependentManager):
         return self.db.virtual_interface_get_by_address(context,
                                                         mac_address)
 
+    @manager.periodic_task(
+        ticks_between_runs=CONF.dns_update_periodic_interval)
+    def _periodic_update_dns(self, context):
+        """Update local DNS entries of all networks on this host"""
+        networks = self.db.network_get_all_by_host(context, self.host)
+        for network in networks:
+            dev = self.driver.get_dev(network)
+            self.driver.update_dns(context, dev, network)
+
     def update_dns(self, context, network_ids):
         """Called when fixed IP is allocated or deallocated"""
         if CONF.fake_network: