Add ability to manage non-inventory hosts

We may want to load balance to existing services that we aren't managing
via ansible. Currently the hosts have to exist in the inventory in order
to add a VIP for these hosts, this patch adds the ability to set the
hostnames and addresses of the hosts manually when they aren't in the
ansible inventory.

Additionally, this patch adds a test for both the group method and the
host_lists method.

Change-Id: Ida66f401d8320d9bf14eac9b8014124631978808

doc/source/configure-haproxy.rst

@@ -167,6 +167,25 @@ An example HTTP service could look like:
           haproxy_port: 10000
           haproxy_balance_type: http
 
+Additionally, you can specify haproxy services that are not managed
+in the Ansible inventory by manually specifying their hostnames/IP Addresses:
+
+.. code-block:: yaml
+
+    haproxy_extra_services:
+      - service:
+          haproxy_service_name: extra-non-inventory-service
+          haproxy_backend_nodes:
+            - name: nonInvHost01
+              ip_addr: 172.0.1.1
+            - name: nonInvHost02
+              ip_addr: 172.0.1.2
+            - name: nonInvHost03
+              ip_addr: 172.0.1.3
+          haproxy_ssl: "{{ haproxy_ssl }}"
+          haproxy_port: 10001
+          haproxy_balance_type: http
+
 
 Adding additional global VIP addresses
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

releasenotes/notes/non_inventory_hosts-c0fa4c185a01e78b.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - HAProxy services that use backend nodes that are not
+    in the Ansible inventory can now be specified manually
+    by setting ``haproxy_backend_nodes`` to a list of
+    ``name`` and ``ip_addr`` settings.

templates/service.j2

@@ -99,10 +99,13 @@ backend {{ item.service.haproxy_service_name }}-back
 
 
 {% for host_name in item.service.haproxy_backend_nodes %}
+{% if hostvars[host_name] is defined %}
+{%   set ip_addr = hostvars[host_name]['ansible_host'] %}
+{% endif %}
 {% set entry = [] %}
 {% set _ = entry.append("server") %}
-{% set _ = entry.append(host_name | string) %}
-{% set _ = entry.append(hostvars[host_name]['ansible_host'] + ":" + haproxy_backend_port | string) %}
+{% set _ = entry.append((host_name.name | default(host_name)) | string) %}
+{% set _ = entry.append((host_name.ip_addr | default(ip_addr)) + ":" + haproxy_backend_port | string) %}
 {% set _ = entry.append("check") %}
 {% set _ = entry.append("port") %}
 {% set _ = entry.append(haproxy_check_port | string) %}
@@ -116,10 +119,13 @@ backend {{ item.service.haproxy_service_name }}-back
 {% endfor %}
 
 {% for host_name in item.service.haproxy_backup_nodes|default([]) %}
+{% if hostvars[host_name] is defined %}
+{%   set ip_addr = hostvars[host_name]['ansible_host'] %}
+{% endif %}
 {% set entry = [] %}
 {% set _ = entry.append("server") %}
-{% set _ = entry.append(host_name | string) %}
-{% set _ = entry.append(hostvars[host_name]['ansible_host'] + ":" + haproxy_backend_port | string) %}
+{% set _ = entry.append((host_name.name | default(host_name)) | string) %}
+{% set _ = entry.append((host_name.ip_addr | default(ip_addr)) + ":" + haproxy_backend_port | string) %}
 {% set _ = entry.append("check") %}
 {% set _ = entry.append("port") %}
 {% set _ = entry.append(haproxy_check_port | string) %}

tests/host_vars/localhost.yml

@@ -0,0 +1,2 @@
+---
+ansible_host: 127.0.0.1

tests/test-vars.yml

@@ -1,2 +1,24 @@
 ---
 external_lb_vip_address: 127.0.0.1
+internal_lb_vip_address: 127.0.0.1
+haproxy_service_configs:
+  - service:
+      haproxy_service_name: test_group
+      haproxy_backend_nodes: "{{ groups['haproxy_all'] | default([]) }}"
+      haproxy_port: 8180
+      haproxy_backend_port: 22
+      haproxy_ssl: False
+      haproxy_balance_type: tcp
+      haproxy_backend_options:
+        - tcp-check
+  - service:
+      haproxy_service_name: test_list
+      haproxy_backend_nodes:
+        - name: "localhost"
+          ip_addr: "127.0.0.1"
+      haproxy_port: 8181
+      haproxy_backend_port: 22
+      haproxy_ssl: False
+      haproxy_balance_type: tcp
+      haproxy_backend_options:
+        - tcp-check