Ansible idempotent MySQL installation Playbook

Question

I want to setup a MySQL server on AWS, using Ansible for the configuration management. I am using the default AMI from Amazon (ami-3275ee5b), which uses yum

Answer 1

I'm adding my own take on the various approaches (centos 7).

The variable mysql_root_password should be stored in an ansible-vault (better) or passed on the command-line (worse)

- name: "Ensure mariadb packages are installed"
  yum: name={{ item }} state="present"
  with_items:
    - mariadb
    - mariadb-server

- name: "Ensure mariadb is running and configured to start at boot"
  service: name=mariadb state=started enabled=yes

# idempotently ensure secure mariadb installation --
# - attempts to connect as root user with no password and then set the root@ mysql password for each mysql root user mode.
# - ignore_errors is true because this task will always fail on subsequent runs (as the root user password has been changed from "")
- name: Change root user password on first run, this will only succeed (and only needs to succeed) on first playbook run
  mysql_user: login_user=root
              login_password=''
              name=root
              password={{ mysql_root_password }}
              priv=*.*:ALL,GRANT
              host={{ item }}
  with_items:
    - "{{ ansible_hostname }}"
    - 127.0.0.1
    - ::1
    - localhost
  ignore_errors: true

- name: Ensure the anonymous mysql user ""@{{ansible_hostname}} is deleted
  action: mysql_user user="" host="{{ ansible_hostname }}" state="absent" login_user=root login_password={{ mysql_root_password }}

- name: Ensure the anonymous mysql user ""@localhost is deleted
  action: mysql_user user="" state="absent" login_user=root login_password={{ sts_ad_password }}

- name: Ensure the mysql test database is deleted
  action: mysql_db db=test state=absent login_user=root login_password={{ mysql_root_password }}