Cloudflare-sync-dns

Run this in cron to regularly sync any IP change into your Cloudflare DNS records.

Node in Bash

NOTE that you can use this nvm-based bash script to run npm commands from cron:

#!/bin/bash
export NVM_DIR="/home/myhome/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm
cloudflare-sync-dns /path/to/settings.json