WOLNUT

WOLNUT is a lightweight Python service designed to work alongside NUT (Network UPS Tools) to automatically send Wake-on-LAN (WOL) packets to client systems after a power outage.

wolnut... get it?

What It Does

When a UPS (connected to NUT) switches to battery power, WOLNUT:

1. Detects the power event via upsc
2. Tracks which clients were online before the outage
3. Waits for power to be restored and the battery to reach a safe threshold
4. Sends WOL packets to bring back any systems that powered down

This helps reboot systems automatically after a controlled shutdown caused by a power loss — especially useful for homelabs, small servers, and media boxes.

Features

• Auto-detect MAC addresses with ARP
• Tracks online status of clients via ping
• Supports NUT with or without authentication
• Persistent state file for post-reboot recovery
• Runs as a standalone Python service or Docker container

Docker

WOLNUT looks for /config/config.yaml on startup.

mkdir ~/wolnut
touch config.yaml

Then copy the example.config.yaml as a starting point.

Docker Run

docker run -d \
  --name wolnut \
  --restart unless-stopped \
  -v ~/wolnut:/config \
  --network host \
  hardwarehaven/wolnut:latest