hpc-cloud/roles/mariadb/tasks/main.yml

# Install a docker based mariadb.
---
- name: include secrets
  include_vars:
    file: ../../secrets.yml
    name: secrets

- name: make mariadb settings volume
  file:
    path: "{{ item }}"
    state: directory
    mode: 0777
  with_items:
    - /srv/mariadb/lib/mysql
    - /srv/mariadb/etc/mysql
    - /srv/mariadb/etc/mysql/conf.d

- name: place settings file
  copy:
    src: files/my.cnf
    dest: /srv/mariadb/etc/mysql/conf.d/my.cnf
    mode: 660

- name: >
        Set galara.cnf on node if we have at least three nodes.
        And we're part of the cluster.
  template:
    src: files/galera.cnf
    dest: /srv/mariadb/etc/mysql/conf.d/galera.cnf
    mode: 660
  when: "'databases' in group_names and groups['databases'] | length >= 3"

  # This mimics galera_new_cluster.sh
- name: Initialize a new cluster.
  block:
    - set_fact:
        mariadb_args: "--wsrep-new-cluster"

    - template:
        src: templates/mysql.service
        dest: /etc/systemd/system/mysql.service
        mode: 644
        owner: root
        group: root

    - command: systemctl daemon-reload

    - systemd:
        name: mysql.service
        state: started

  when: "'databases' in group_names and groups['databases'] \
         | length >= 3 and ansible_hostname == hostname_node0"

- name: install service file.
  block:
    - set_fact:
        mariadb_args: ""
    - template:
        src: templates/mysql.service
        dest: /etc/systemd/system/mysql.service
        mode: 644
        owner: root
        group: root

- name: Give the master node some time to initialize the cluster.
  command: bash -c "sleep 60"
  when: "'databases' in group_names and groups['databases'] \
         | length >= 3"

- name: Daemon reload (the implicit doesn't work)
  command: bash -c "systemctl daemon-reload"

- name: make sure service is started
  systemd:
    name: mysql.service
    state: started
    daemon_reload: yes

- name: start service at boot.
  command: systemctl reenable mysql.service

- name: Give the cluster some time to initialize replication.
  command: bash -c "sleep 60 && systemctl daemon-reload"
  when: "'databases' in group_names and groups['databases'] | length >= 3"