initial commit

files/mysql.service

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+[Unit]
+Description=Mariadb Container
+After=docker.service
+Requires=docker.service
+ 
+[Service]
+TimeoutStartSec=0
+Restart=always
+ExecStartPre=-/usr/bin/docker stop %n
+ExecStartPre=-/usr/bin/docker rm %n
+ExecStartPre=/usr/bin/docker pull mariadb:10.1.22
+ExecStart=/usr/bin/docker run  -p 3306:3306 --name %n -v /srv/lib/mysql:/var/lib/mysql \
+ -e MYSQL_ROOT_PASSWORD=geheim mariadb:10.1.22
+ 
+[Install]
+WantedBy=multi-user.target

mariadb.yml

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+# Install a docker based mariadb.
+---
+- name: Install a mariadb server with databases in a persistent volume
+  hosts: all # Should be specified of course
+  become: True
+  tasks:
+    - name: install docker packages
+      apt: pkg={{ item }} state=latest update_cache=yes
+      with_items:
+         - docker-engine
+    - name: install service file.
+      template:
+        src: files/mysql.service
+        dest: /etc/systemd/system/mysql.service
+        mode: 644
+        owner: root
+        group: root
+    - name: install service file
+      command: systemctl daemon-reload
+    - name: make sure service is started
+      systemd:
+        name: mariadb.service
+        state: started