nut-watcher

For some reason, nut-driver on the Raspberry Pi likes to break. Every few days it stalls out trying to talk to my UPS. nut-watcher is a simple Go service that polls the driver and if it fails to poll 3 times in a row, it instructs systemd to restart nut-driver.service.

Building

To build for a raspberry pi:

GOOS=linux GOARCH=arm64 go build -o nut-watcher -v main.go

An example systemd unit:

[Unit]
Description=Network UPS Tools Watchdog
After=network.target nut-server.service nut-driver.service nut-monitor.service

[Service]
Environment=NUT_EXPORTER_PASSWORD=***
ExecStart=/usr/local/bin/nut-watcher --username=***
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target