cloud Shell · Cloudflare API · Linux · Cron
Cloudflare DDNS Updater
A shell script that detects the public IPv4 address and automatically updates a Cloudflare DNS record in dynamic-IP environments.
- Problem
- When an ISP changes the public IP, DNS names used to reach home servers or remote resources stop pointing to the correct address.
- Solution
- The script compares the current IPv4 address with the Cloudflare record and uses the API to update it; cron can run the check periodically without manual intervention.
- Outcome
- A simple self-hosted DDNS updater that keeps a Cloudflare-managed domain reachable without a static public address.
- Stack
- ShellCloudflare APILinuxCron
Focused dynamic DNS
The project targets a Linux server and requires a Cloudflare-managed domain, a DNS record, API credentials, and the zone identifier.
Scheduled automation
A cron entry runs the script at the selected interval, turning public-IP checks and DNS updates into a repeatable background task.