ansible/roles/prometheus/tasks/main.yml

---
- name: Install Prometheus Components
  apt:
    name:
      - prometheus
      - prometheus-pushgateway
    state: latest
    update_cache: true
  register: apt_result
  retries: 3
  until: apt_result is succeeded

- name: Ensure the alert folder exist
  file:
    path: /etc/prometheus/alerts
    state: directory
    group: prometheus
    owner: prometheus
    mode: u=rwx,g=rx,o=rx

- name: Ensure the target folder exist
  file:
    path: /etc/prometheus/targets
    state: directory
    group: prometheus
    owner: prometheus
    mode: u=rwx,g=rx,o=rx

- name: Copy the CA cert
  copy:
    content: "{{ ca_cert }}"
    dest: /etc/prometheus/ca.crt
  notify:
   - Restart prometheus
   - Reload nginx

- name: Generate certificate
  include_role:
    name: generate-cert
  vars:
    directory: /etc/prometheus/
    cname: "prometheus-{{ lan_address }}"
    owner: prometheus
    group: prometheus
    key_mode: u=rw,g=,o=
    subject_alt_name: "IP:{{ lan_address }}"
# Need an equivalent to notify here

- name: Ensured the certificate is monitored
  import_tasks: register-cert-to-monitoring.yml
  vars:
    target: "{{ lan_address }}:9090|prometheus-{{ lan_address }}|{{ ansible_facts['nodename'] }}"

- name: Setup the prometheus config
  template:
    src: prometheus.yml
    dest: /etc/prometheus/prometheus.yml
    owner: prometheus
    group: prometheus
    mode: '0640'
  notify: Restart prometheus
  no_log: {{ enable_no_log | default('true') }}

- name: Add node targets file
  template:
    src: node-targets.json
    dest: "/etc/prometheus/targets/{{ item }}-targets.json"
    owner: prometheus
    group: prometheus
    mode: '0640'
    force: no
  notify: Restart prometheus
  loop:
    - blackbox-http-down
    - blackbox-http-up
    - blackbox-tls-internal
    - node

- name: Copy the web-config folder
  template:
    src: web-config.yaml
    dest: /etc/prometheus/web-config.yaml
    group: prometheus
    owner: prometheus
    mode: u=rw,g=r,o=r
  notify: Restart prometheus

- name: Setup the arguments for prometheus
  template:
    src: prometheus
    dest: /etc/default/prometheus
    owner: root
    group: root
    mode: '0644'
  notify: Restart prometheus
  vars:
    args:
      - name: web.listen-address
        value: "127.0.0.1:9090"
#        value: "{{ lan_address }}:9090"
#      - name: web.config.file # Not available before 2.24, and it sucks
#        value: /etc/prometheus/web-config.yaml

# Here we go, using nginx to add mSSL to prometheus... because who need to authentication on the server with ALL the jucy data?
# Think prometheus, think!
- name: Copy the nginx config
  template:
    src: atrocious_nginx_stub
    dest: "/etc/nginx/sites-available/internal-prometheus"
  notify: Reload nginx

- name: Activate the config
  file:
    src: "/etc/nginx/sites-available/internal-prometheus"
    dest: "/etc/nginx/sites-enabled/internal-prometheus"
    state: link
    force: yes