CloudFlare IP update from Shell

updateDomain.sh

#!/bin/bash

# set your user, token (key) name server and a comma-separated list of A records you want to change
[email protected]
CFP=myCloudFlareToken
CFNS=MYcloudFlareNS
CFHOSTS=my.host.tochange.com
CFUPHOSTS=myhost.tochange.com,myhost.tochange.com

# get your current external ip address
CFIP=$(curl -s http://myip.dnsomatic.com/)

# build the url you need to do the update
CFURL="https://www.cloudflare.com/api.html?a=DIUP&hosts=$CFUPHOSTS&u=$CFU&tkn=$CFP&ip=$CFIP"

# find out the ip address listed in DNS for the first host in your list
CFHOSTIP=$(nslookup $(echo $CFHOSTS | cut -d ',' -f1) $CFNS | \
     grep Address | tail -1 | cut -d ' ' -f2)

# if your current external IP are different from what shows in DNS do the update
if [ "$CFIP" != "$CFHOSTIP" ]
then
     # use curl to do the dynamic update
     /usr/bin/curl -s $CFURL
fi
echo $CFURL

You can retrieve token in the admin area of CloudFlare