This script automatically updates a Cloudflare DNS record with the current external IP address of the machine running the script. It is designed to be a more readable and maintainable Python version of an older shell script.

• Configuration Loading: Reads configuration parameters from a JSON file.
• IP Address Handling: Retrieves the current external IP address and checks if it has changed since the last update.
• Cloudflare Integration: Uses Cloudflare API to get Zone ID and Domain ID, and updates the DNS record if the IP address has changed.
• Error Handling: Provides error messages and retries for network operations to ensure reliability.
• Usage: The script is designed to be run from the command line with a configuration file as an argument.

• Python 3.x
• requests library (can be installed via pip install requests)

1. Install the requests library:

   pip install requests
   

2. Create a configuration file (config.json) with the following structure:

{
    "LAST_IP_FILE": "last_ip.txt",
    "CF_EMAIL": "[email protected]",
    "CF_TOKEN": "your-cloudflare-api-token",
    "CF_ZONE_NAME": "example.com",
    "CF_DOMAIN_NAME": "sub.example.com"
}

3. Run the script:

python update_cloudflare_dns.py config.json