Allow to manage extra services, mounts and networks

We do mainatain set of systemd roles, that allow to easily provision
extra services, mounts or even networks and used quite widely across
roles. This way we can ease lives of deployers and need of maintaining
external playbooks and roles that will do basically same. Feature for a
way to create/manage internal networking was also asked for quite
a while amoung users. Systemd-service role can also be used to
define post/pre hooks for configured networks and systemd_mount
can be usefull to setup a shared filesystems for image or volume
conversion directories to avoid running out of diskspace on controllers.

Change-Id: Ia13f7747696db5b7b7640df7532c6d55627bdd01

defaults/main.yml

@@ -192,4 +192,14 @@ openstack_hosts_package_manager_extra_conf: ''
 openstack_hosts_apt_pinned_packages:
   - package: "src:ceph"
     origin: "ubuntu-cloud.archive.canonical.com"
-    priority: 400
+    priority: 400
+
+# Define extra systemd services/networks/mounts
+openstack_hosts_systemd_mounts: []
+# Systemd networks can be configured only on bare metal hosts
+# systemd-networkd role won't run inside containers.
+openstack_hosts_systemd_networkd_devices: []
+openstack_hosts_systemd_networkd_networks: []
+openstack_hosts_systemd_networkd_prefix: openstack-net
+openstack_hosts_systemd_services: []
+openstack_hosts_systemd_slice: "openstack-hosts"

releasenotes/notes/openstack_hosts_systemd-4f47056a732820bd.yaml

@@ -0,0 +1,23 @@
+---
+prelude: >
+    It is now possible to create and manage third-party services,
+    mount points and networks on hosts managed by OpenStack-Ansible.
+    This also inlcudes networks, that are required for OpenStack-Ansible
+    installation, like br-mgmt or br-storage.
+    In order to configure specific resources on selected set of hosts,
+    usage of group_vars or host_vars is appreciated.
+features:
+  - |
+    Added new varaibles that allow users to configure extra systemd
+    services, networks or mounts on openstack hosts. While services and
+    mounts can be configured on any targeted hosts, networks will be created
+    only on bare metal nodes. In order to configure extra networks in
+    containers please reffer to ``openstack_user_config.yml`` documentation.
+    A list of new variables that were added:
+
+      * openstack_hosts_systemd_mounts
+      * openstack_hosts_systemd_networkd_devices
+      * openstack_hosts_systemd_networkd_networks
+      * openstack_hosts_systemd_networkd_prefix
+      * openstack_hosts_systemd_services
+      * openstack_hosts_systemd_slice

tasks/main.yml

@@ -163,3 +163,13 @@
       tags:
         - openstack_hosts-config
   when: ansible_facts['hostname'] != 'aio1'
+
+- include_tasks: openstack_hosts_systemd.yml
+  args:
+    apply:
+      tags:
+        - openstack_hosts-config
+        - openstack_hosts-systemd
+  when: openstack_hosts_systemd_networkd_devices or openstack_hosts_systemd_networkd_networks or openstack_hosts_systemd_services or openstack_hosts_systemd_mounts
+  tags:
+    - always

tasks/openstack_hosts_systemd.yml

@@ -0,0 +1,44 @@
+---
+# Copyright 2022, Cleura AB.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- name: Run the systemd-networkd role
+  include_role:
+    name: systemd_networkd
+  vars:
+    systemd_networkd_prefix: "{{ openstack_hosts_systemd_networkd_prefix }}"
+    systemd_run_networkd: true
+    systemd_netdevs: "{{ openstack_hosts_systemd_networkd_devices }}"
+    systemd_networks: "{{ openstack_hosts_systemd_networkd_networks }}"
+  when:
+    - openstack_hosts_systemd_networkd_devices
+    - openstack_hosts_systemd_networkd_networks
+    - is_metal
+
+- name: Run the systemd-service role
+  include_role:
+    name: systemd_service
+  vars:
+    systemd_slice_name: "{{ openstack_hosts_systemd_slice }}"
+    systemd_services: "{{ openstack_hosts_systemd_services }}"
+  when:
+    - openstack_hosts_systemd_services
+
+- name: Run the systemd mount role
+  include_role:
+    name: systemd_mount
+  vars:
+    systemd_mounts: "{{ openstack_hosts_systemd_mounts }}"
+  when:
+    - openstack_hosts_systemd_mounts