Installing node_exporter as systemd serivice

node_exporter-as-systemd-service.md

sudo useradd --system --shell /bin/false node_exporter

curl -fsSL https://github.com/prometheus/node_exporter/releases/download/v1.3.1/node_exporter-1.3.1.linux-amd64.tar.gz \
  | sudo tar -zxvf - -C /usr/local/bin --strip-components=1 node_exporter-1.3.1.linux-amd64/node_exporter \
  && sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter

sudo tee /etc/systemd/system/node_exporter.service <<"EOF"
[Unit]
Description=Node Exporter

[Service]
User=node_exporter
Group=node_exporter
EnvironmentFile=-/etc/sysconfig/node_exporter
ExecStart=/usr/local/bin/node_exporter $OPTIONS

[Install]
WantedBy=multi-user.target
EOF

sudo systemctl daemon-reload && \
sudo systemctl start node_exporter && \
sudo systemctl status node_exporter && \
sudo systemctl enable node_exporter

The branch got merged into master (started on that branch for animated schematics by accident so just PR'd it to master).
Now have node_exporter running on the temporary Droplet. And local prom on 9090 and local Grafana on 3000 with the node exporter full dashboard showing the stats for the remote DO instance.

Note that It's not recommended to deploy it as a Docker container because it requires access to the host system.

So there's a task to repeat this 'bare metal' install on do-set.
But first we will try to get the 'bare metal' CH install running on DO.
Then try the dockerised CH with metrics on DO

Hello.
I tired to copy and paste this instruction. So I wrote ansible playbook.
May be someone found it useful.

- name: Install node_exporter.
  hosts: localhost
  connection: local
  become: true
  gather_facts: true

  vars:
    environment_file_path: '/etc/sysconfig/node_exporter'

  handlers:
    - name: Start node_exporter
      ansible.builtin.systemd:
        name: node_exporter.service
        daemon_reload: true
        state: started

    - name: Restart node_exporter
      ansible.builtin.systemd:
        name: node_exporter.service
        daemon_reload: true
        state: restarted

  tasks:
    - name: Set environment file path in Debian.
      when: ansible_facts.os_family == 'Debian'
      ansible.builtin.set_fact:
        environment_file_path: '/etc/default/node_exporter'

    - name: Ensure that node_exporter group is exist.
      ansible.builtin.group:
        name: node_exporter
        system: true
        state: present

    - name: Ensure that node_exporter user is exist.
      ansible.builtin.user:
        name: node_exporter
        group: node_exporter
        system: true
        shell: /bin/false
        state: present

    - name: Download node_exporter archive.
      ansible.builtin.unarchive:
        src: 'https://github.com/prometheus/node_exporter/releases/download/v1.11.1/node_exporter-1.11.1.linux-arm64.tar.gz'
        dest: /usr/local/bin
        creates: /usr/local/bin/node_exporter
        remote_src: true
        include:
          - "node_exporter-1.11.1.linux-arm64/node_exporter"
        extra_opts: ['--strip-components=1']
        owner: root
        group: root
        mode: '0755'

    - name: Copy systemd unit template.
      ansible.builtin.copy:
        content: |
          [Unit]
          Description=Node Exporter

          [Service]
          User=node_exporter
          Group=node_exporter
          EnvironmentFile=-{{ environment_file_path }}
          ExecStart=/usr/local/bin/node_exporter $OPTIONS

          [Install]
          WantedBy=multi-user.target
        dest: /etc/systemd/system/node_exporter.service
        owner: root
        group: root
        mode: '0755'
      notify:
        - Start node_exporter
        - Restart node_exporter

    - name: Copy environment file content.
      ansible.builtin.copy:
        content: >
          OPTIONS="--collector.systemd --web.listen-address=127.0.0.1:9100"
        dest: "{{ environment_file_path }}"
        owner: root
        group: root
        mode: '0644'
      notify:
        - Start node_exporter
        - Restart node_exporter