prometheus/tasks/mysqld_exporter.yml

---
- name: 'prometheus | mysqld exporter | get latest release from GitHub'
  shell: curl --silent "https://api.github.com/repos/prometheus/mysqld_exporter/releases/latest" | jq -r .tag_name | sed "s/v//"
  register: prometheus_mysqld_exporter_version
  run_once: true

- name: 'prometheus | mysqld exporter | download'
  get_url:
    url: https://github.com/prometheus/mysqld_exporter/releases/download/v{{ prometheus_mysqld_exporter_version.stdout }}/mysqld_exporter-{{ prometheus_mysqld_exporter_version.stdout }}.linux-amd64.tar.gz
    dest: /tmp

- name: 'prometheus | mysqld exporter | unarchive'
  unarchive:
    remote_src: yes
    src: /tmp/mysqld_exporter-{{ prometheus_mysqld_exporter_version.stdout }}.linux-amd64.tar.gz
    dest: /tmp

- name: 'prometheus | mysqld exporter | move to /usr/local/bin'
  copy:
    src: /tmp/mysqld_exporter-{{ prometheus_mysqld_exporter_version.stdout }}.linux-amd64/mysqld_exporter
    dest: /usr/local/bin/prometheus-mysqld-exporter
    remote_src: yes
    owner: root
    group: root
    mode: 0755
  notify:
    - 'prometheus | mysqld exporter | restart service'

- name: 'prometheus | mysqld exporter | install unit file to systemd'
  template:
    src: systemd/prometheus-mysqld-exporter.service.j2
    dest: /etc/systemd/system/prometheus-mysqld-exporter.service
    owner: root
    group: root
    mode: 0600

- name: 'prometheus | mysqld exporter | configure systemd to use service'
  systemd:
    daemon_reload: yes
    enabled: yes
    name: prometheus-mysqld-exporter.service

- name: 'prometheus | mysqld exporter | configuration'
  copy:
    dest: '/var/lib/prometheus/.my.cnf'
    owner: root
    group: root
    mode: 0644
    backup: yes
    content: |
      [client]
      user={{ prometheus_mysqld_exporter_user }}
      password={{ prometheus_mysqld_exporter_password }}
  when:
    - prometheus_mysqld_exporter_user is defined
  register: prometheus_mysqld_exporter_configuration
  notify:
    - 'prometheus | mysqld exporter | restart service'