#Install proftpd
Digital Ocean: How To Set Up ProFTPD on CentOS 6
thesysad.com: Setting Up FTP Server Using ProFTPD in CentOS
ProFTPD: Virtual Users
ProFTPD: Logins and Authentication
ProFTPD: Using AuthUserFiles
ftpasswd: tool for ProFTPD's AuthUserFile, AuthGroupFile, UserPassword
Linux and Unix umask command
How to Enable EPEL Repository for RHEL/CentOS 7.x/6.x/5.x
sudo rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
yum --enablerepo=epel install proftpd
chkconfig --level 3 proftpd on
service proftpd start