designate: allow designate_ns_record to be a list

In most real world deployments, there will be multiple backend DNS
servers, allow to specify all of them for the pool configuration.

Change-Id: Ic9737d0446a807891b429f080ae1bf048a3c8e4a

ansible/group_vars/all.yml

@@ -958,7 +958,8 @@ cloudkitty_storage_backend: "influxdb"
 #######################
 # Valid options are [ bind9, infoblox ]
 designate_backend: "bind9"
-designate_ns_record: "sample.openstack.org"
+designate_ns_record:
+  - "ns1.example.org"
 designate_backend_external: "no"
 designate_backend_external_bind9_nameservers: ""
 # Valid options are [ '', redis ]

ansible/roles/designate/templates/pools.yaml.j2

@@ -4,8 +4,15 @@
   description: Default BIND9 Pool
   attributes: {}
   ns_records:
+{% if designate_ns_record is string %}
     - hostname: {{ designate_ns_record }}.
       priority: 1
+{% else %}
+{% for host in designate_ns_record %}
+    - hostname: {{ host }}.
+      priority: 1
+{% endfor %}
+{% endif %}
   nameservers:
 {% if designate_backend == 'bind9' %}
 {% for host in groups['designate-backend-bind9'] %}

ansible/roles/neutron/templates/neutron.conf.j2

@@ -65,7 +65,9 @@ router_distributed = True
 {% endif %}
 
 {% if enable_designate | bool %}
+{% if designate_ns_record is string %}
 dns_domain = {{ designate_ns_record }}.
+{% endif %}
 external_dns_driver = designate
 {% if neutron_plugin_agent == 'vmware_nsxv' %}
 nsx_extension_drivers = vmware_nsxv_dns

doc/source/reference/networking/designate-guide.rst

@@ -35,7 +35,8 @@ Configure Designate options in ``/etc/kolla/globals.yml``
 .. code-block:: yaml
 
    dns_interface: "eth1"
-   designate_ns_record: "sample.openstack.org"
+   designate_ns_record:
+     - "ns1.sample.openstack.org"
 
 .. important::
 

etc/kolla/globals.yml

@@ -548,7 +548,8 @@
 ###################
 # Valid options are [ bind9 ]
 #designate_backend: "bind9"
-#designate_ns_record: "sample.openstack.org"
+#designate_ns_record:
+#  - "ns1.example.org"
 # Valid options are [ '', redis ]
 #designate_coordination_backend: "{{ 'redis' if enable_redis|bool else '' }}"