ansible-roles/prometheus-node-exporter/tasks/main.yml

---
- block:
    - name: Create the user under the node exporter will run
      user: name={{ prometheus_n_e_user }} home={{ prometheus_n_e_home }} createhome=no shell=/usr/sbin/nologin system=yes

    - name: Create the prometheus node exporter base directory
      file: dest={{ item }} state=directory owner=root group=root
      with_items:
        - '{{ prometheus_n_e_home }}'
        - '{{ prometheus_n_e_dist_dir }}'

    - name: Create the prometheus node exporter log directory
      file: dest={{ prometheus_n_e_logdir }} state=directory owner={{ prometheus_n_e_user }} group={{ prometheus_n_e_user }}

    - name: Download the prometheus node exporter
      get_url: url={{ prometheus_n_e_download_url }} dest=/srv/

    - name: Unarchive the prometheus distribution
      unarchive: src=/srv/{{ prometheus_n_e_file }} dest={{ prometheus_n_e_dist_dir }} remote_src=yes owner=root group=root
      args:
        creates: '{{ prometheus_n_e_dist_dir }}/{{ prometheus_n_e_dir }}/node_exporter'
      notify: Restart node exporter

    - name: Install the prometheus node exporter upstart script
      template: src=node_exporter.upstart.j2 dest=/etc/init/node_exporter.conf mode=0644 owner=root group=root
      when: ansible_service_mgr != 'systemd'

    - name: Install the prometheus node exporter systemd unit
      template: src=node_exporter.systemd.j2 dest=/etc/systemd/system/node_exporter.service mode=0644 owner=root group=root
      when: ansible_service_mgr == 'systemd'
      notify: systemd reload

    - name: Ensure that prometheus node_exporter is started and enabled
      service: name=node_exporter state=started enabled=yes

  tags: [ 'prometheus', 'node_exporter' ]
  when: prometheus_n_e_install

- block:
    - name: Ensure that prometheus node_exporter is stopped and disabled
      service: name=node_exporter state=stopped enabled=no

    - name: Remove prometheus node exporter upstart script
      file: dest=/etc/init/node_exporter.conf state=absent
      when: ansible_service_mgr != 'systemd'

    - name: Remove the prometheus node exporter systemd unit
      file: dest=/etc/systemd/system/node_exporter.service state=absent
      when: ansible_service_mgr == 'systemd'
      notify: systemd reload

  tags: [ 'prometheus', 'node_exporter' ]
  when: not prometheus_n_e_install