---
- name: Install Prometheus Node Exporter
  hosts: all
  become: true
  vars:
    node_exporter_version: "1.10.2"
    architecture: "linux-amd64"
    # Defines where the binary is downloaded/extracted
    download_url: "https://github.com/prometheus/node_exporter/releases/download/v{{ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.{{ architecture }}.tar.gz"

  tasks:
    - name: Create node_exporter group
      group:
        name: node_exporter
        state: present

    - name: Create node_exporter user
      user:
        name: node_exporter
        group: node_exporter
        shell: /bin/false
        create_home: no

    - name: Download and unarchive Node Exporter
      unarchive:
        src: "{{ download_url }}"
        dest: /tmp/
        remote_src: yes

    - name: Move binary to /usr/local/bin
      copy:
        src: "/tmp/node_exporter-{{ node_exporter_version }}.{{ architecture }}/node_exporter"
        dest: /usr/local/bin/node_exporter
        mode: '0755'
        owner: node_exporter
        group: node_exporter
        remote_src: yes

    - name: Create Systemd service file
      copy:
        dest: /etc/systemd/system/node_exporter.service
        content: |
          [Unit]
          Description=Node Exporter
          Wants=network-online.target
          After=network-online.target

          [Service]
          User=node_exporter
          Group=node_exporter
          Type=simple
          ExecStart=/usr/local/bin/node_exporter

          [Install]
          WantedBy=multi-user.target

    - name: Force systemd to reread configs
      systemd:
        daemon_reload: yes

    - name: Enable and start Node Exporter
      systemd:
        name: node_exporter
        state: started
        enabled: yes

    - name: Clean up temporary files
      file:
        path: "/tmp/node_exporter-{{ node_exporter_version }}.{{ architecture }}"
        state: absent