Monitoring Pi-hole: Having your Raspberry Pi, and eating it with Prometheus remote write!

The article introduces Pi-hole, an open-source network advertisement and internet tracking blocker, and explains how to monitor it using Prometheus Remote Write on a Raspberry Pi. Pi-hole operates by intercepting DNS requests to block potentially dangerous or ad-laden content, protecting all network-connected devices. The guide addresses the limitations of using a Raspberry Pi's SD card for intensive data storage by suggesting a configuration that sends data to a Prometheus server hosted elsewhere, thereby minimizing local storage use. It details the setup process, including installing Docker, deploying a Prometheus exporter for Pi-hole metrics, and configuring Prometheus to scrape these metrics and use remote write for centralized monitoring. Additionally, the author highlights using Sysdig Monitor and PromQL for creating dashboards that enhance visibility into network requests, ultimately offering a secure and manageable solution for maintaining network integrity with minimal overhead.