Cloudflare Dynamic DNS Script

Cloudflare Dynamic DNS Script.md

Cloudflare Dynamic DNS

1. Create an API token. Go to Profile > API Tokens and create a token.

2. Use the API to list your zones to deterimine ID of the zone you want to update.

3. Use the API to list your zone records to determine the ID of the record(s) you want to update.

4. Use the following bash script to update these records, filling in your API token, zone id, and record ids:

#!/bin/bash

api_token="YOUR API TOKEN"
zone="YOUR ZONE ID"
records=("YOUR 1st RECORD ID" "YOUR 2nd RECORD ID" "YOUR 3rd RECORD ID")
public_ip=$(curl -s "http://ipecho.net/plain")

echo "Public IP is ${public_ip}"

for record in "${records}"; do
	echo "Updating ${zone} -> ${record}"
	curl -s -X PATCH "https://api.cloudflare.com/client/v4/zones/${zone}/dns_records/${record}" \
	-H "Authorization: Bearer ${api_token}" \
	-H "Content-Type:application/json" \
	--data "{\"content\":\"${public_ip}\"}"
	echo ""
done

5. Create a systemd timer or cron job to run this script periodically, e.g. every hour.