Explanation: I run a number of services behind a NAT at home which are only accessible through a WireGuard VPN. My IP rarely if ever changes, but it it does, this script will send me a Discord notification so I can update my VPN endpoint while away from home.

Yes, obviously this problem is solved with a DDNS service, of which there are many. But, I don't have any public DNS records and only need the IP endpoint for WireGaurd.

Runs in a Docker container running cron every 30 minutes.

Can just as easily be adapted to run on the host instead.

Uses Cloudflare's zero-log ip lookup (https://1.1.1.1/cdn-cgi/trace)

• The script ip_notify.py runs as a oneshot service. It caches the current ip to a file and checks for differences on next run
• Run as a cron job
• Or run the supplied docker image and compose project (cron in docker)

• --webhook The Discord webhook endpoint (Required)
• -o | --cache-dir The file to write save the previous ip to (Default: $XDG_CONFIG_HOME/ip-notify/old_ip)
• --test Send the webhook even if the IP hasn't changed

Most useful when running in Docker (See docker-compose.yml).

# The discord webhook url. Include here or in .env file
WEBHOOK_URL=${WEBHOOK_URL}
# The color of the Discord Embed in hex
EMBED_COLOR=1bb106
# The link when clicking the Embed author
AUTHOR_URL=https://github.com/jack-mil/ip-notify
# The icon for the Embed and User avatar
ICON_URL=https://1.1.1.1/favicon.ico
# The file (in the container) to store the previous ip
IP_CACHE=/data/ip.txt
# An additional log file (in the container)
LOG_FILE=/data/logs.txt

• Install python requirements with pip from requirements.txt

• Alternatively, a VS Code Dev container config is supplied

• Dockerfile and an example Docker Compose project are provided if preferred

Thanks to these projects for inspiration:

• https://github.com/timothymiller/cloudflare-ddns
• https://github.com/teobouvard/turnip