First time startup, the container will initialize 389 directory server instance. There will be errors related to systemd service and fips. It would be ignored due to it is not available in container.
Secure connection will be initialized at first time startup. It uses self-signed certificate with 240 months validity from first startup. You can replace
it with your prefer external CA and external server certificate. You must setup persistent volume before replacement.
Changing FQDN_NAME variable after first startup, it will not change the server certificate. You must manually change it. For self-signed server certificate, you can follow /root/create-selfsigned-cert.sh file as a given example.
There is no suffix and database after first startup. You must create suffix, database and some entries up to your requirement. However, there are example scripts to create suffix, database and entries for dc=example,dc=com. You see it in Usage section above.
Cockpit for 389 directory server is not available in this container image.