If you select Subdomain as the Reverse Proxy Method, when configuring a Docker Repository, the Registry Name in the Docker Repository Configuration Advanced tab will be set automatically to the required value, and will use the Repository Key as the Subdomain.
Using the Subdomain method requires a Wildcard certificate such as.
*. myservername.org. You also need to ensure that the certificate you use supports the number of levels used in your subdomain.
Docker Settings in HTTP Settings
Corresponding HTTP Settings in Docker Repository Advanced Configuration