Cloudflare Python DynDNS

This script provides a way to implement a self-hosted Dynamic DNS (DynDNS) service that automatically updates your Cloudflare DNS record with your current public IP address whenever it changes.

Setup

1. Create a Subdomain: Set up a subdomain like dyndns.your-domain.com in your Cloudflare account. All other DNS records should be CNAME records that resolve to dyndns.your-domain.com.

2. Retrieve Cloudflare Details: In your Cloudflare dashboard, find the following details for the subdomain you created:

   • Zone ID
   • DNS Record Name
   • DNS Record ID

   Set these values in the script configuration.

3. How It Works: The script checks your current public IP address. If it has changed, it updates the DNS record for dyndns.your-domain.com to reflect the new IP address.

Deployment

Step 1: Create Virtual Environment

python3 -m venv /opt/cloudflare-python-dyndns/venv
/opt/cloudflare-python-dyndns/venv/bin/activate

Step 2: Install Dependencies

Clone the repository and install required Python packages:

pip install -r /path/to/requirements.txt

Step 3: Set Up Cron Job

To run the script periodically, open your crontab and add the following line to check for IP address changes every 15 minutes:

crontab -e

Then add this line:

*/15 * * * * /opt/cloudflare-python-dyndns/venv/bin/python /opt/cloudflare-python-dyndns/cloudflare-python-dyndns/main.py >/dev/null 2>&1

Environment Variables

Make sure to create a .env file in the project directory and add the following environment variables:

CLOUDFLARE_API_TOKEN: Your Cloudflare API token with permission to edit DNS records.`
CLOUDFLARE_ZONE_ID: The Zone ID of your domain in Cloudflare.
CLOUDFLARE_DNS_RECORD_NAME: The DNS record name (e.g., dyndns.your-domain.com).
CLOUDFLARE_DNS_RECORD_ID: The DNS record ID for the dyndns record.

Roadmap

Support for IPv6 addresses.
Automate the process of fetching the DNS Record Name and ID.

Authors

• @lucashahmann

License

MIT