updating an A record in a cpanel dns zone editor via a dyndns client
copy config.php and update.php and .htaccess into ./nic in a subdomain created to host the update files. eg. ddns.example.ca
update config.php with your username/pass. cpServer is the url you use to access cpanel. port is usually 2083 authUsers/pass is same as above for me. authHostnames is the A record you wish to update these can all be comma seperated to update multiple records. user/pass must also be in multiple even if they are the same.
used https://help.ubuntu.com/community/DynamicDNS to set up ddclient on my local server.
sudo nano /etc/ddclient.conf
my config file looks like this
#Configuration file for ddclient generated by debconf
#
#/etc/ddclient.conf
daemon=3600
use=web, web=checkip.dyndns.com/, web-skip='Current IP Address: '
protocol=dyndns2
server=ddns.example.ca
login=user
password='pass'
server.example.ca
run sudo ddclient -daemon=0 -debug -verbose -noquiet to check