[tinwood, r=thedac] Fixes Bug#1475534 Added config option 'dhcp-agents-per-network'

config.yaml

@@ -398,6 +398,12 @@ options:
     description: |
       Minimum number of l3 agents to host a router. Only used when enable-l3ha
       is True
+  dhcp-agents-per-network:
+    default: 1
+    type: int
+    description: |
+      The number of dhcp agents to be deployed per network. Note that if the
+      Calico plugin is being used, this option has no effect.
   nagios_servicegroups:
     default: ""
     type: string

hooks/neutron_api_context.py

@@ -174,6 +174,7 @@ class NeutronCCContext(context.NeutronContext):
                 config('max-l3-agents-per-router')
             ctxt['min_l3_agents_per_router'] = \
                 config('min-l3-agents-per-router')
+        ctxt['dhcp_agents_per_network'] = config('dhcp-agents-per-network')
         ctxt['overlay_network_type'] = self.neutron_overlay_network_type
         ctxt['external_network'] = config('neutron-external-network')
         if config('neutron-plugin') in ['vsp']:

templates/icehouse/neutron.conf

@@ -47,6 +47,8 @@ neutron_firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptable
 
 {% if neutron_plugin == 'Calico' -%}
 dhcp_agents_per_network = 1000
+{% else -%}
+dhcp_agents_per_network = {{ dhcp_agents_per_network }}
 {% endif -%}
 
 {% include "parts/rabbitmq" %}

templates/juno/neutron.conf

@@ -47,6 +47,8 @@ neutron_firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptable
 
 {% if neutron_plugin == 'Calico' -%}
 dhcp_agents_per_network = 1000
+{% else -%}
+dhcp_agents_per_network = {{ dhcp_agents_per_network }}
 {% endif -%}
 
 {% include "parts/rabbitmq" %}

templates/kilo/neutron.conf

@@ -51,6 +51,8 @@ neutron_firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptable
 
 {% if neutron_plugin == 'Calico' -%}
 dhcp_agents_per_network = 1000
+{% else -%}
+dhcp_agents_per_network = {{ dhcp_agents_per_network }}
 {% endif -%}
 
 notify_nova_on_port_status_changes = True

templates/liberty/neutron.conf

@@ -51,6 +51,8 @@ neutron_firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptable
 
 {% if neutron_plugin == 'Calico' -%}
 dhcp_agents_per_network = 1000
+{% else -%}
+dhcp_agents_per_network = {{ dhcp_agents_per_network }}
 {% endif -%}
 
 notify_nova_on_port_status_changes = True

unit_tests/test_neutron_api_context.py

@@ -284,6 +284,7 @@ class NeutronCCContextTest(CharmTestCase):
         self.test_config.set('plumgrid-password', 'plumgrid')
         self.test_config.set('plumgrid-virtual-ip', '192.168.100.250')
         self.test_config.set('enable-ml2-port-security', True)
+        self.test_config.set('dhcp-agents-per-network', 3)
 
     def tearDown(self):
         super(NeutronCCContextTest, self).tearDown()
@@ -297,6 +298,7 @@ class NeutronCCContextTest(CharmTestCase):
             'debug': True,
             'enable_dvr': False,
             'l3_ha': False,
+            'dhcp_agents_per_network': 3,
             'external_network': 'bob',
             'neutron_bind_port': self.api_port,
             'verbose': True,
@@ -331,6 +333,7 @@ class NeutronCCContextTest(CharmTestCase):
             'debug': True,
             'enable_dvr': False,
             'l3_ha': False,
+            'dhcp_agents_per_network': 3,
             'external_network': 'bob',
             'neutron_bind_port': self.api_port,
             'verbose': True,
@@ -376,6 +379,7 @@ class NeutronCCContextTest(CharmTestCase):
             'overlay_network_type': 'gre',
             'max_l3_agents_per_router': 2,
             'min_l3_agents_per_router': 2,
+            'dhcp_agents_per_network': 3,
             'quota_floatingip': 50,
             'quota_health_monitors': -1,
             'quota_member': -1,