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src/node-exporter/README.md

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+# Node Exporter
+
+[English](./README.md) | [中文](./README.zh.md)
+
+This service deploys Prometheus Node Exporter, which exposes hardware and OS metrics from *NIX kernels.
+
+## Services
+
+- `node-exporter`: Prometheus Node Exporter service
+
+## Environment Variables
+
+| Variable Name               | Description           | Default Value |
+| --------------------------- | --------------------- | ------------- |
+| NODE_EXPORTER_VERSION       | Node Exporter version | `v1.8.2`      |
+| NODE_EXPORTER_PORT_OVERRIDE | Host port mapping     | `9100`        |
+
+Please modify the `.env` file as needed for your use case.
+
+## Usage
+
+### Start Node Exporter
+
+```bash
+docker compose up -d
+```
+
+### Access Metrics
+
+- Metrics endpoint: <http://localhost:9100/metrics>
+
+### Configure Prometheus
+
+Add this scrape config to your Prometheus configuration:
+
+```yaml
+scrape_configs:
+  - job_name: 'node'
+    static_configs:
+      - targets: ['localhost:9100']
+```
+
+## Metrics Collected
+
+Node Exporter collects a wide variety of system metrics:
+
+- **CPU**: usage, frequency, temperature
+- **Memory**: usage, available, cached
+- **Disk**: I/O, space usage
+- **Network**: traffic, errors
+- **File system**: mount points, usage
+- **Load**: system load averages
+- **And many more**
+
+## Network Mode
+
+For more accurate metrics, you can run Node Exporter with host network mode. Uncomment in `docker-compose.yaml`:
+
+```yaml
+network_mode: host
+```
+
+Note: When using host network mode, port mapping is not needed.
+
+## Notes
+
+- Node Exporter should run on each host you want to monitor
+- The service needs access to host filesystem and processes
+- Metrics are exposed in Prometheus format
+- No authentication is provided by default
+
+## Security
+
+- Bind to localhost only if running Prometheus on the same host
+- Use firewall rules to restrict access to the metrics endpoint
+- Consider using a reverse proxy with authentication for production
+- Monitor access logs for suspicious activity
+
+## License
+
+Node Exporter is licensed under Apache License 2.0. See [Node Exporter GitHub](https://github.com/prometheus/node_exporter) for more information.