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This article will provide a guide for how to install and configure Node Exporter on Debian VPS. What is Node Exporter? Node Exporter is a Prometheus exporter that collects and exposes hardware and OS-level metrics from Linux and Unix-like systems. It runs as a background service and makes these metrics available over HTTP, typically at http://localhost:9100/metrics, where Prometheus scrapes them for monitoring and alerting. What It Monitors Node Exporter gathers system-level metrics such as: CPU usage Memory usage Disk I/O and space Network statistics Filesystem metrics System load and uptime Hardware sensor data (if available) Systemd service states Key Features Lightweight & efficient: Minimal overhead, ideal for all server types. Easy integration: Works seamlessly with Prometheus and Grafana. Modular collectors: Can enable or disable specific metric collectors. Secure options: Supports TLS and basic auth (via reverse proxy or exporter wrappers). Common Use Case Infrastructure monitoring: Paired with Prometheus and Grafana to build dashboards and alerting systems for your servers' health and performance. Prerequisites A Debian VPS (Debian 10/Debian 11/Debian 12) Root or sudo access Prometheus server (optional, but needed for metrics scraping) How to Install and Configure Node Exporter on Debian VPS To install and configure Node Exporter on Debian VPS, follow the steps below: Create a Dedicated User It’s best practice to run Node Exporter as a non-privileged system user. sudo useradd --no-create-home --shell /usr/sbin/nologin node_exporter Download Node Exporter Find the latest version from the official releases page: https://github.com/prometheus/node_exporter/releases Download and extract: cd /tmp wget https://github.com/prometheus/node_exporter/releases/download/v1.9.1/node_exporter-1.9.1.linux-amd64.tar.gz tar -xzf node_exporter-1.9.1.linux-amd64.tar.gz Replace 1.9.1 with the latest version if needed. Move the binary to a system path: sudo mv node_exporter-1.9.1.linux-amd64/node_exporter /usr/local/bin/ sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter Create a Systemd Service Create a systemd service file to manage Node Exporter as a system service. sudo nano /etc/systemd/system/node_exporter.service Paste the following: DescriptionPrometheus Node Exporter Wantsnetwork-online.target Afternetwork-online.target Usernode_exporter Groupnode_exporter Typesimple ExecStart/usr/local/bin/node_exporter WantedBymulti-user.target Save and exit. Start and Enable the Service sudo systemctl daemon-reexec sudo systemctl daemon-reload sudo systemctl start node_exporter sudo systemctl enable node_exporter Check status: sudo systemctl status node_exporter Allow Port in Firewall By default, Node Exporter exposes metrics on port 9100. If ufw is enabled: sudo ufw allow 9100/tcp Test Node Exporter Open your browser or use curl to check if it's running: http://:9100/metrics You should see a long list of metrics in plain text. Configure Prometheus to Scrape Node Exporter If you're using Prometheus, add the target in prometheus.yml: - job_name: 'node_exporter' static_configs: - targets: Reload Prometheus or restart the service: sudo systemctl restart prometheus Bonus: Secure Node Exporter with NGINX + Lets Encrypt To secure Node Exporter with TLS (HTTPS), you’ll need to wrap it behind a reverse proxy like NGINX (since Node Exporter doesn’t support TLS natively). We’ll use Certbot to get a Let’s Encrypt SSL certificate. Prerequisites Domain name pointing to your VPS (e.g. metrics.example.com) Node Exporter running on localhost:9100 Port 80 and 443 open in firewall To secure Node Exporter with TLS using NGINX + Let's Encrypt, follow the steps below: Install NGINX sudo apt update sudo apt install nginx -y Enable and start: sudo systemctl enable nginx sudo systemctl start nginx Configure Reverse Proxy for Node Exporter Create a new NGINX config: sudo nano /etc/nginx/sites-available/node_exporter Paste this config (replace domain name): server { listen 80; server_name metrics.example.com; location / { proxy_pass http://localhost:9100/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; } } Enable the site: sudo ln -s /etc/nginx/sites-available/node_exporter /etc/nginx/sites-enabled/ sudo nginx -t sudo systemctl reload nginx Install Certbot and Get SSL Certificate Install Certbot: sudo apt install certbot python3-certbot-nginx -y Request SSL: sudo certbot --nginx -d metrics.example.com When prompted, choose to redirect HTTP to HTTPS. Auto-Renew SSL Certificate Let’s Encrypt certs are valid for 90 days. Add a cron job to auto-renew: sudo systemctl list-timers | grep certbot Certbot installs a timer automatically. To test: sudo certbot renew --dry-run Test Access Over HTTPS Visit: https://metrics.example.com You should see Node Exporter’s /metrics output over a secure HTTPS connection. Verify Metrics in Prometheus Visit Prometheus web UI: http://prometheus.example.com:9090 Run a query like: node_cpu_seconds_total You should see live metrics. Conclusion You now know how to install and configure Node Exporter on Debian VPS. Related: How to Install Prometheus on Debian VPS Top 10 Best Grafana Dashboards for Service Monitoring How to Deploy a Telegraf, InfluxDB and Grafana Stack on Debian VPS

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