Add your system User
Yes, it is this simple, creating a new user for ftp access in vsftpd is as easy as creating a new valid linux system user.
Disable SSH access for FTP users
The default user creation script will give a user the /bin/bash shell, which can be a little too powerful. If you don’t want your users logging into your server via SSH, we need to know how to block this access. If you change the shell to /bin/false, the users will only be able to login via ftp or mail if you have that setup. Here is how to modify your users: