Hello。Such an error occurred when Upgrading Fleet, indicating that the connection was rejected, but It was normal for me to link to the database

It’s trying to connect to localhost. You need to pass it the same MySQL connection variables as when you run

fleet serve

Yes, this is our production environment... Then I should have used./ fleet preapre db --mysql_address = XXX :3306 \ --mysql_database = XXX \ --mysql_username = XXX \ --mysql_password = XXX?