Dynamic DNS for CloudFlare
Edit YOUR_CLOUDFLARE_API, YOUR_CLOUDFLARE_EMAIL, ZONE_NAME, RECORD_ID, RECORD_TYPE, RECORD_NAME in cloudflare-ddns.sh with yours.
Make the script run every five minutes to ensure no more than 5 minutes downtime should your wan IP change.
$ crontab -e
Add the following line and save it.
*/5 * * * * /path/to/cloudflare-ddns.sh