add MariaDB role

roles/mariadb/tasks/main.yml

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+---
+
+- name: Install mariadb
+  import_tasks: mariadb.yml
+
+- name: Install mysqld exporter
+  import_tasks: mysqld_exporter.yml

roles/mariadb/tasks/mariadb.yml

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+---
+- name: Add MariaDB GPG apt key
+  apt_key:
+    url: https://mariadb.org/mariadb_release_signing_key.asc
+    keyring: /usr/share/keyrings/mariadb_release_signing_key.gpg
+    state: present
+
+- name: Add MariaDB Repository
+  apt_repository:
+    repo: "deb [arch={{ deb_architecture }} signed-by=/usr/share/keyrings/mariadb_release_signing_key.gpg] \
+          https://mirrors.n-ix.net/mariadb/repo/{{ mariadb_server_version }}/ubuntu {{ ansible_distribution_release }} main/debug"
+    state: present
+    update_cache: true
+
+- name: Install MariaDB
+  apt:
+    name: mariadb-server
+    state: latest
+    update_cache: true
+    cache_valid_time: 3600
+
+- name: Install required system packages
+  apt:
+    name: python3-mysqldb  # needed for mariadb ansible module
+    state: latest
+    update_cache: true
+    cache_valid_time: 3600
+
+- name: Copy configuration file
+  template:
+    src: my.cnf.j2
+    dest: /etc/mysql/my.cnf
+    owner: mysql
+    group: mysql
+    mode: 0600
+  notify: restart mariadb

roles/mariadb/tasks/mysqld_exporter.yml

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+---
+
+- name: Get latest mysqld_exporter version
+  github_release:
+    user: prometheus
+    repo: mysqld_exporter
+    action: latest_release
+    token: "{{ vault_github_token }}"
+  delegate_to: localhost
+  run_once: true
+  register: mysqld_exporter_version
+- name: "{{ mysqld_exporter_version }}"
+  set_fact:
+    mysqld_exporter_version: "{{ mysqld_exporter_version | replace ('v', '', 1) | trim }}"
+  run_once: true
+
+- name: download mysqld_exporter {{ mysqld_exporter_version.tag }} from GitHub
+  get_url:
+    url: "https://github.com/prometheus/mysqld_exporter/releases/download/\
+          v{{ mysqld_exporter_version.tag }}/mysqld_exporter-{{ mysqld_exporter_version.tag }}\
+          .linux-{{ deb_architecture }}.tar.gz"
+    dest: "/tmp/mysqld_exporter-{{ mysqld_exporter_version.tag }}.linux-{{ deb_architecture }}.tar.gz"
+  register: _download_archive
+  until: _download_archive is succeeded
+  retries: 3
+  delay: 5
+
+- name: unpack mysqld_exporter binaries
+  unarchive:
+    src: "/tmp/mysqld_exporter-{{ mysqld_exporter_version.tag }}.linux-{{ deb_architecture }}.tar.gz"
+    dest: "/tmp"
+    creates: "/tmp/mysqld_exporter-{{ mysqld_exporter_version.tag }}.linux-{{ deb_architecture }}"
+    remote_src: true
+
+- name: Copy mysqld_exporter
+  copy:
+    src: "/tmp/mysqld_exporter-{{ mysqld_exporter_version.tag }}.linux-{{ deb_architecture }}/mysqld_exporter"
+    dest: "{{ mysqld_exporter_install_dir }}/mysqld_exporter"
+    remote_src: true
+    mode: 0755
+  notify: restart mysqld_exporter
+
+- name: Copy the mysqld_exporter systemd service file
+  template:
+    src: mysqld_exporter.service.j2
+    dest: /etc/systemd/system/mysqld_exporter.service
+    owner: root
+    group: root
+    mode: 0644
+  notify: restart mysqld_exporter