find the correct database server packages on CentOS 7

roles/mysql/tasks/mysql_server.yml

@@ -23,7 +23,15 @@
     - MySQL-python
     - mysql-server
   sudo: true
-  when: ansible_os_family == "RedHat"
+  when: ansible_os_family == "RedHat" and ansible_distribution_major_version < 7
+
+- name: Installing MySQL RedHat
+  yum: name="{{ item }}" state=latest
+  with_items:
+    - mariadb-server
+  sudo: true
+  when: ansible_os_family == "RedHat" and ansible_distribution_major_version >= 7
+
 
 - name: "Starting MySQL"
   service: name=mysql state=started enabled=true