added backup support

defaults/main.yml

@@ -1,4 +1,7 @@
 mariadb:
+  backup:
+    enable: True
+    keep_days: 3
   users: {}
 #    mysql:
 #      host: localhost

tasks/backup.yml

@@ -0,0 +1,21 @@
+- name: add mysql backup folder
+  file:
+    path: /opt/mysqlbackup/
+    state: directory
+    owner: root
+    group: root
+    mode: '750'
+
+- name: add backup cronjob for easier backup/restore
+  cron:
+    name: db backup
+    job: '/usr/bin/mysqldump --all-databases --single-transaction | gzip > /opt/mysqlbackup/$(date "+\%Y\%m\%d-\%H\%M.sql.gz")'
+    user: root
+    hour: "*/4"
+    minute: 45
+
+- name: add backup cleanup cronjob
+  cron:
+    name: db backup cleanup
+    job: 'find /opt/mysqlbackup/* -mtime +{{ mariadb.backup.keep_days }} -type f -exec rm {} \;'
+    special_time: daily

tasks/main.yml

@@ -20,3 +20,7 @@
     password: "{{ item.value.password }}"
     priv: "{{ item.value.priv | default('*.*:USAGE') }}"
   with_dict: "{{ mariadb.users }}"
+
+- include_tasks: backup.yml
+  when:
+  - mariadb.backup.enable