---
- name: Install Prometheus Node Exporter
  hosts: all
  become: yes

  tasks:
    - name: Create node_exporter group
      group:
        name: "node_exporter"
        state: present
        system: true

    - name: Create node_exporter user
      user:
        name: "node_exporter"
        group: "node_exporter"
        comment: "Node Exporter"
        shell: /bin/false
        home: "/usr/sbin/nologin"
        system: true
        state: present

    - name: Download and unzip Node Exporter
      unarchive:
        src: "https://github.com/prometheus/node_exporter/releases/download/v{{ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.linux-amd64.tar.gz"
        dest: /tmp/
        remote_src: yes
        validate_certs: no

    - name: Move the binary to the installation directory
      copy:
        src: "/tmp/node_exporter-{{ node_exporter_version }}.linux-amd64/node_exporter"
        dest: "/usr/local/bin/node_exporter"
        owner: "node_exporter"
        group: "node_exporter"
        mode: 0755
        remote_src: true

    - name: Remove archive
      file:
        path: /tmp/node_exporter-{{ node_exporter_version }}.linux-amd64/
        state: absent

    - name: Install service
      template:
        src: node_exporter.service.j2
        dest: /etc/systemd/system/node_exporter.service
        owner: root
        group: root
        mode: 0755

    - name: Restart service and pickup changes
      systemd:
        state: restarted
        daemon_reload: yes
        name: node_exporter.service
        enabled: yes