I always need to look for the default password for MariaDB and phpMyAdmin in my NAS. There is no hint at all. Some even change the rules after upgrade. Therefore, I write a note here and share to save your time. This page would be continuously maintained.
When trying to improve ZurmoCRM performance on NAS, I have separate PHP programs and MySQL running on different machine. It is a good idea to run MySQL with RAID 1 to protect data from hardware failure.
I also explain how to harden your NAS to protect MySQL service from remote connection.