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Architecture

AtomicNix combines several architectural patterns to achieve reliable over-the-air updates on embedded hardware:

  • A/B partition scheme with paired boot and rootfs slots
  • Read-only squashfs rootfs with OverlayFS root (squashfs lower + tmpfs upper) for runtime state
  • U-Boot boot-count rollback with watchdog integration (currently disabled on Rock64 during development)
  • Network isolation with no IP forwarding between WAN and LAN interfaces
  • EN18031-compliant authentication with no embedded credentials

This chapter covers each of these in detail. For the rationale behind specific design choices, see Design Decisions.