A ddclient config file for use with Cloudflare. See https://gist.github.com/klittlepage/7243505 for a Cloudflare patch to the 3.8.1 version of ddclient.

ddclient.conf

daemon=1800                             # check every 300 seconds
syslog=yes                              # log update msgs to syslog
mail=root                               # mail all msgs to root
mail-failure=root                       # mail failed update msgs to root
pid=/var/run/ddclient.pid               # record PID in file.
ssl=yes                                 # use ssl-support.  Works with
                                        # ssl-library

use=web, web=checkip.dyndns.com/, web-skip='IP Address'
cache=/tmp/ddclient.cache

#
## CloudFlare (cloudflare.com)
##
protocol=cloudflare,
zone=<your root domain name>,    \
login=<cloudflare login e-mail>, \
password=<cloudflare API key>    \
<your fully qualified domain>