ansible-proxmox-prometheus-node-exporter.yaml

---
- name: Install Prometheus Node Exporter
  hosts: all
  become: yes
  vars:
    node_exporter_version: "1.9.1"
    node_exporter_user: "pve-exporter"
    node_exporter_binary_path: "/usr/local/bin/node_exporter"
    node_exporter_port: "9100"

  tasks:
    - name: Download node_exporter
      get_url:
        url: "https://github.com/prometheus/node_exporter/releases/download/v{{ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.linux-amd64.tar.gz"
        dest: "/tmp/node_exporter-{{ node_exporter_version }}.linux-amd64.tar.gz"
        mode: '0644'

    - name: Extract node_exporter
      unarchive:
        src: "/tmp/node_exporter-{{ node_exporter_version }}.linux-amd64.tar.gz"
        dest: "/tmp"
        remote_src: yes

    - name: Copy node_exporter binary
      copy:
        src: "/tmp/node_exporter-{{ node_exporter_version }}.linux-amd64/node_exporter"
        dest: "{{ node_exporter_binary_path }}"
        mode: '0755'
        owner: root
        group: root
        remote_src: yes

    - name: Create node_exporter user
      user:
        name: "{{ node_exporter_user }}"
        shell: /bin/false
        system: yes
        create_home: no

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

          [Service]
          User={{ node_exporter_user }}
          Group={{ node_exporter_user }}
          Type=simple
          Restart=on-failure
          RestartSec=5s
          ExecStart={{ node_exporter_binary_path }}

          [Install]
          WantedBy=multi-user.target
        mode: '0644'
      notify: reload systemd

    - name: Clean up temporary files
      file:
        path: "{{ item }}"
        state: absent
      loop:
        - "/tmp/node_exporter-{{ node_exporter_version }}.linux-amd64.tar.gz"
        - "/tmp/node_exporter-{{ node_exporter_version }}.linux-amd64"

    - name: Enable and start prometheus-node-exporter service
      systemd:
        name: prometheus-node-exporter
        enabled: yes
        state: started
        daemon_reload: yes

    - name: Wait for service to start
      wait_for:
        port: "{{ node_exporter_port }}"
        delay: 5
        timeout: 30

    - name: Check if port 9100 is listening
      shell: netstat -tlnp | grep :{{ node_exporter_port }}
      register: netstat_result
      changed_when: false

    - name: Display port status
      debug:
        msg: "Node Exporter is listening on port {{ node_exporter_port }}: {{ netstat_result.stdout }}"

  handlers:
    - name: reload systemd
      systemd:
        daemon_reload: yes