prometheus/tasks/postgresql_exporter.yml

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

- name: 'prometheus | postgres exporter | download'
  get_url:
    url: https://github.com/prometheus-community/postgres_exporter/releases/download/v{{ prometheus_postgres_exporter_version.stdout }}/postgres_exporter-{{ prometheus_postgres_exporter_version.stdout }}.linux-amd64.tar.gz
    dest: /tmp

- name: 'prometheus | postgres exporter | unarchive'
  unarchive:
    remote_src: yes
    src: /tmp/postgres_exporter-{{ prometheus_postgres_exporter_version.stdout }}.linux-amd64.tar.gz
    dest: /tmp

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

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

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

- name: 'prometheus | postgres exporter | configuration'
  copy:
    dest: '/etc/default/prometheus-postgres-exporter'
    owner: root
    group: root
    mode: 0644
    backup: yes
    content: |
      DATA_SOURCE_NAME='postgresql://{{ prometheus_exporter_postgresql_user }}:{{ prometheus_exporter_postgresql_password }}@{{ prometheus_exporter_postgresql_host }}:{{prometheus_exporter_postgresql_port }}/''
      ARGS=''
  when:
    - prometheus_postgres_exporter_user is defined
    - prometheus_postgres_exporter_password is defined
    - prometheus_postgres_exporter_host is defined
    - prometheus_postgres_exporter_port is defined
  register: prometheu_postgres_exporter_configuration
  notify:
    - 'prometheus | postgres exporter | restart service'