If your domain is managed by cloudflare and you wan't to add a dyndns entry (your home router), here are the scripts.
It's a simple shell script which gets your external ip via ipify.org and pushes the record to cloudflare.
Clone this repo to your disk.
Add your cloudflare data to Use update.sh (and get_record_id.sh).
Use get_record_id.sh to find your cloudflare record id.
Use update.sh to push your new ip (e.g. via cronjob).
Returns exitcode 0 if successfully updated.