Add ability to define a config for journald

At the moment we aim to make systemd-journald a universal destination
for log files across services. With that there is currently no way
of configuring journald using OSA. While this might be
neat for production deployments, it's very valuable to have for CI
as well.

Change-Id: I70a8c9266cb12811a58f5a183955dbec319e539f
(cherry picked from commit 65f28c5bb406980500f012cf0ad3320ddb69e2ed)

defaults/main.yml

@@ -172,6 +172,8 @@ openstack_hosts_power_tool_enable: "{{ ('repo_all' in groups or 'manila_all' in
 
 # Keep a history of systemd journals on disk after reboots
 openstack_host_keep_journals: yes
+# Define arbitrary configration for systemd-journald
+openstack_hosts_journald_config: {}
 
 # Enable/Disable the yum fastestmirror plugin
 openstack_hosts_enable_yum_fastestmirror: yes

releasenotes/notes/journald_config-e3b0e5060dd5f6e7.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added variable ``openstack_host_journald_config`` that allows to supply
+    arbitrary configuration for systemd-journald as a mapping.

tasks/main.yml

@@ -171,6 +171,11 @@
       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
+  when:
+    - openstack_hosts_systemd_networkd_devices or
+      openstack_hosts_systemd_networkd_networks or
+      openstack_hosts_systemd_services or
+      openstack_hosts_systemd_mounts or
+      openstack_hosts_journald_config
   tags:
     - always

tasks/openstack_hosts_systemd.yml

@@ -42,3 +42,25 @@
     systemd_mounts: "{{ openstack_hosts_systemd_mounts }}"
   when:
     - openstack_hosts_systemd_mounts
+
+- name: Configure systemd-journald
+  when: openstack_hosts_journald_config
+  block:
+    - name: Create /etc/systemd/journald.conf.d directory
+      file:
+        path: /etc/systemd/journald.conf.d
+        state: directory
+        owner: root
+        group: systemd-journal
+        mode: "0755"
+
+    - name: Define journald configuration
+      copy:
+        content: |-
+          [Journal]
+          {% for key, value in openstack_hosts_journald_config.items() %}
+          {{ key }}={{ value }}
+          {% endfor %}
+        dest: /etc/systemd/journald.conf.d/99-osa-journal.conf
+      notify:
+        - Restart systemd-journald