Cloudflare now requires ddclient version 3.9.1 or higher due to a change to APIv4.
Debian/Ubuntu packages are currently behind at 3.8.x (As of 2020.08.06)
See : .
ddclient.conf
The 'cloudflare' protocol is used by DNS service offered by www.cloudflare.com.
Configuration variables applicable to the 'cloudflare' protocol are:
protocol=cloudflare ##
server=fqdn.of.service ## defaults to www.cloudflare.com
login=service-login ## login name and password registered with the service
password=service-password ##
fully.qualified.host ## the host registered with the service.
Example ddclient.conf file entries:
## single host update
protocol=cloudflare, \
zone=dns.zone, \
login=my-cloudflare.com-login, \
password=my-cloudflare.com-secure-token \
myhost.com
## multiple host update to the custom DNS service
protocol=cloudflare, \
zone=dns.zone, \
login=my-cloudflare.com-login, \
password=my-cloudflare.com-secure-token \
my-toplevel-domain.com,my-other-domain.com