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!DynDNS with ddclient

{{{
> sudo apt-get update                               # update repositories
> sudo apt-get install ddclient                     # install
> sudo vi /etc/ddclient.conf                        # config file
> sudo service ddclient restart                     # restart daemon
> sudo cat /var/cache/ddclient/ddclient.cache       # IP cache uploaded before
> systemctl status ddclient                         # status check
> journalctl -xeu ddclient                          # log 
> sudo ddclient -query                              # try all common dyndns services
> sudo ddclient -daemon=0 -debug -verbose -noquiet  # start directly with verbose output to analyse
}}}

With current Raspberry OS 

verbose=yes  # for detailed logging