HAProxy extra endpoints

Allow the operator to define a list of additional HAProxy endpoints
without overriding the entire haproxy_service_configs list.

This moves the default endpoints to a var called haproxy_default_services
and combines the default services list with haproxy_extra_services if
defined.

Change-Id: I701a6e8740c0afa326b6e2310b46822c37a3e50d

doc/source/install-guide/configure-haproxy.rst

@@ -146,6 +146,27 @@ certificates and keys to use with HAProxy.
 
 .. _Securing services with SSL certificates: configure-sslcertificates.html
 
+Configuring additional services
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Additional haproxy service entries can be configured by setting
+``haproxy_extra_services`` in ``/etc/openstack_deploy/user_variables.yml``
+
+For more information on the service dict syntax, please reference
+``playbooks/vars/configs/haproxy_config.yml``
+
+An example HTTP service could look like:
+
+.. code-block:: yaml
+
+    haproxy_extra_services:
+      - service:
+          haproxy_service_name: extra-web-service
+          haproxy_backend_nodes: "{{ groups['service_group'] | default([]) }}"
+          haproxy_ssl: "{{ haproxy_ssl }}"
+          haproxy_port: 10000
+          haproxy_balance_type: http
+
 --------------
 
 .. include:: navigation.txt

playbooks/haproxy-install.yml

@@ -101,6 +101,7 @@
         - haproxy-service-config
   roles:
     - role: "haproxy_server"
+      haproxy_service_configs: "{{ haproxy_default_services + haproxy_extra_services|default([]) }}"
       tags:
         - "haproxy-server"
     - role: "rsyslog_client"
@@ -114,4 +115,3 @@
     - vars/configs/haproxy_config.yml
   vars:
     is_metal: "{{ properties.is_metal|default(false) }}"
-

playbooks/vars/configs/haproxy_config.yml

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-haproxy_service_configs:
+haproxy_default_services:
   - service:
       haproxy_service_name: galera
       haproxy_backend_nodes: "{{ [groups['galera_all'][0]] | default([]) }}"  # list expected

releasenotes/notes/haproxy-extra-configs-67a77803494d3e97.yaml

@@ -0,0 +1,8 @@
+---
+features:
+  - Added a new ``haproxy_extra_services`` var which will allow extra haproxy
+    endpoint additions.
+deprecations:
+  - Moved ``haproxy_service_configs`` var to ``haproxy_default_service_configs``
+    so that ``haproxy_service_configs`` can be modified and added to without
+    overriding the entire default service dict.