Make api_workers configurable

- Add api_workers attribute and neutron.conf template variable

Issue rcbops/chef-cookbooks#935

(cherry picked from commit c67e4e7)

README.md

@@ -83,6 +83,7 @@ Nova Networking
 
 Neutron Networking
 ----
+* `neutron["api_workers"]` - number of api worksers to start in wsgi. defaults to 0
 * `neutron["network_api_class"]` - used in nova.conf.the neutron api driver class. 
 * `neutron["auth_strategy"]` - used in nova.conf. the authentication strategy to use, by default this is set to keystone
 * `neutron["libvirt_vif_driver"]`- used in nova.conf. the virtual interface driver, by default nova.virt.libvirt.vif.LibvirtHybridOVSBridgeDriver

attributes/default.rb

@@ -68,6 +68,7 @@
 # Neutron Configuration Attributes
 # ######################################################################### #
 # nova.conf options for neutron
+default["neutron"]["api_workers"] = 0
 default["neutron"]["network_api_class"] = "nova.network.neutronv2.api.API"
 default["neutron"]["auth_strategy"] = "keystone"
 default["neutron"]["libvirt_vif_type"] = "ethernet"

recipes/neutron-common.rb

@@ -144,6 +144,7 @@
   group "neutron"
   mode "0640"
   variables(
+    "api_workers" => node["neutron"]["api_workers"],
     "neutron_debug" => node["neutron"]["debug"],
     "neutron_verbose" => node["neutron"]["verbose"],
     "neutron_ipaddress" => api_endpoint["host"],

templates/default/neutron.conf.erb

@@ -13,6 +13,7 @@ ovs_use_veth = <%= @neutron_ovs_use_veth %>
 allow_overlapping_ips = <%= @overlapping_ips %>
 use_namespaces = <%= @neutron_namespace %>
 api_paste_config = /etc/neutron/api-paste.ini
+api_workers = <%= @api_workers %>
 control_exchange = neutron
 rabbit_host = <%= @rabbit_ipaddress %>
 rabbit_ha_queues = <%= @rabbit_ha_queues %>