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cloudflare-dyndns

A simple shell script to update a single DNS record on cloudflare according to your own current IP address.

Use as a replacement for one of the dynamic DNS services.

Note: This script uses the ipify.com API to determine your current IP address. If you have privacy concerns about that, other ways of finding your IP are possible. Pull requests welcome!

Setup and deployment

Enable a domain on cloudflare, and add an A Record for the host you want to use:

cloudflare screenshot

Copy .env.production.example to .env.production and edit the settings to match your domain. Create an auth token with cloudflare that includes the scope: Edit Zone DNS for the zone in question.

Build and deploy the container with docker:

  • docker-compose build
  • docker-compose up -d

Party time.

By default, the cron job inside the container runs an IP check every 10 minutes. You can check success in the logs: docker-compose logs

Development (or non-docker deployment)

Install these dependencies:

  • dig (part of dnsutils)
  • curl
  • jq

Run ./src/update-ip.sh directly.

License

© 2020, Fred Wenzel. MIT licensed, see ./LICENSE.