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Serving a Website on a Raspberry Pi Zero Running in RAM

This post details how to set up a website served entirely from a Raspberry Pi Zero's RAM, leveraging its limited 512MB memory for diskless operation. It caters to the Hacker News appreciation for extreme technical optimization and resourceful hardware hacks. The guide provides a comprehensive walkthrough, covering everything from disk preparation to external VPS configuration for TLS termination and robust backup strategies.

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May 8, 3:00 PM
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The Lowdown

The article outlines an impressive project: hosting a public website on a Raspberry Pi Zero v1.3 running Alpine Linux, entirely from its 512MB RAM, without a persistent disk. The author emphasizes the ingenuity required to operate diskless, highlighting that even with RAM being abundant elsewhere, the Pi Zero's constraints make this a notable feat.

Key aspects of the setup include:

  • Hardware Essentials: A Raspberry Pi Zero v1.3, a small microSD card (512MB+) used initially for boot and configuration persistence, and optional Ethernet hardware.
  • Diskless Alpine Linux: A detailed process for installing Alpine Linux in diskless mode, ensuring the root filesystem operates from tmpfs or ramfs.
  • Persistence with lbu: Utilizing Alpine's lbu (Local Backup Utility) to commit configurations and website files to the microSD card, ensuring changes survive reboots.
  • Lightweight Web Servers: Choice between darkhttpd for static content or nginx for more flexibility, configured to run efficiently with limited resources.
  • External VPS for TLS: Offloading TLS termination and traffic handling to a low-spec external VPS (like TierHive) running socat to forward secure traffic to the local Pi Zero, which only serves HTTP.
  • Network Configuration: Instructions for opening ports on the local network, configuring static IPs, and setting up dynamic DNS (DDNS) if needed.
  • Backup Strategy: Simple and effective dd command to create byte-for-byte image backups of the microSD card, or direct backup after removing the card from the running, diskless Pi.

The project demonstrates remarkable resourcefulness in utilizing minimal hardware to achieve a fully functional, publicly accessible website, showcasing practical techniques for optimizing embedded systems for web serving.