Register DDNS (Optional)

If you do not plan to access your server outside of your local network, or if you have a static public IP and your own domain, you can skip this section.

This guide will use the DuckDNS.org service as DDNS in order to map a subdomain to our server. We will register a subdomain on DuckDNS.org and configure our server to update the IP on DuckDNS.org.

Steps

1. Register a subdomain on DuckDNS.org.
   1. Access and create an account at https://www.duckdns.org/.
   2. Register a subdomain of your preference. Write down the generated token because we are going to need it next.
2. Copy the script that updates the DDNS with our public IP to sbin: cp ./scripts/duck.sh /usr/local/sbin/.
3. Edit the script: nano /usr/local/sbin/duck.sh. Replace XXX with the subdomain we registered and YYY with the token we generated during registration. Save and exit with Ctrl + X, Y, Enter.
4. We change the permissions of the script so that only root can access it: chmod 700 /usr/local/sbin/duck.sh. The script contains our token, which is the only thing that allows only us to change the IP to which the subdomain points, hence the importance of securing it.