[ubuntu] Best practice for FTP

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http://ubuntuforums.org – Hi. I have few questions about setting and using FTP server. At first, I want to know what is the best solution for FTP server with about hundreds or thousands users. Is best choice to create system accounts and restrict it only to FTP or create virtual accounts or to use SQL database? At second, How to manage access to folders? Example - I have user "A" , "B" and "C". Both "A" and "B" wants to see their own folder but also want to see folder of user "C". User "C" wants to see only his own folder. What is the best practice t (Hardware)