Enable send_arp_for_ha in l3_agent.ini

send_arp_for_ha is defined for nova networks in the nova cookbook and
referenced here but never templated for quantum/neutron l3_agent.

- Add attribute for send_arp_for_ha_count in nova networks
- Add attribute for send_arp_for_ha in quantum/neutron
- Document new attributes in README
- Template send_arp_for_ha in l3_agent.ini

https://github.com/rcbops-cookbooks/nova will need to be updated
following this change.

See rcbops/chef-cookbooks#877

README.md

@@ -75,6 +75,7 @@ Nova Networking
 * `nova["network"]["dhcp_domain"]` - Domain to use for building hostnames
 * `nova["network"]["force_dhcp_release"]` - Send DHCP release on instance termination?
 * `nova["network"]["send_arp_for_ha"]` - Send gratuitous ARPs for HA setup?
+* `nova["network"]["send_arp_for_ha_count"]` - Number of gratuitous ARPs to send. defaults to 3
 * `nova["network"]["auto_assign_floating_ip"]` - Auto-assigning floating ip to VM?
 * `nova["network"]["floating_pool_name"]` - if creating a floating ip pool, what to name it
 * `nova["network"]["multi_host"]` - Use multi-host mode?
@@ -88,6 +89,7 @@ Neutron Networking
 * `neutron["linuxnet_interface_driver"]` - used in nova.conf. the linux net interface driver, by default nova.network.linux_net.LinuxOVSInterfaceDriver
 * `neutron["firewall_driver"]` - used in nova.conf. the firewall driver to use, by default nova.virt.libvirt.firewall.IptablesFirewallDriver
 * `neutron["agent_down_time"]` - Seconds elapsed until an agent is considered down
+* `neutron["send_arp_for_ha"]` - Number of gratuitous ARPs to send. defaults to 3. 0 disables arps completely.
 * `neutron["services"]["api"]["scheme"]` - scheme for service (http/https)
 * `neutron["services"]["api"]["network"]` - `osops_networks` network name which service operates on
 * `neutron["services"]["api"]["port"]` - port service binds to

attributes/default.rb

@@ -47,6 +47,7 @@
 default["nova"]["network"]["dhcp_domain"] = "novalocal"
 default["nova"]["network"]["force_dhcp_release"] = true
 default["nova"]["network"]["send_arp_for_ha"] = true
+default['nova']["network"]["send_arp_for_ha_count"] = 3
 default["nova"]["network"]["auto_assign_floating_ip"] = false
 default["nova"]["network"]["floating_pool_name"] = "nova"
 default["nova"]["network"]["multi_host"] = true
@@ -76,6 +77,7 @@
   "nova.network.linux_net.LinuxOVSInterfaceDriver"
 default["neutron"]["firewall_driver"] =
   "nova.virt.firewall.NoopFirewallDriver"
+default['neutron']["send_arp_for_ha"] = 3
 
 # Set the notification Driver
 # Options are no_op, rpc, log, rabbit

recipes/neutron-l3-agent.rb

@@ -69,7 +69,8 @@
   variables(
     "neutron_external_bridge" => node["neutron"][plugin]["external_bridge"],
     "nova_metadata_ip" => metadata_ip,
-    "neutron_plugin" => node["neutron"]["plugin"]
+    "neutron_plugin" => node["neutron"]["plugin"],
+    "send_arp_for_ha" => node["neutron"]["send_arp_for_ha"]
   )
   notifies :restart, "service[neutron-l3-agent]", :delayed
   notifies :enable, "service[neutron-l3-agent]", :delayed

templates/default/l3_agent.ini.erb

@@ -4,6 +4,8 @@ external_network_bridge = <%= @neutron_external_bridge %>
 metadata_ip = <%= @nova_metadata_ip %>
 metadata_port = 8775
 
+send_arp_for_ha = <%= @send_arp_for_ha %>
+
 <% if @neutron_plugin == "ovs" %>
 # OVS
 interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver