i use this everytime i reinstall the os
Code: 
yum -y install proftpd
nano /etc/shells
Add this line in /etc/shells file (sudo gedit /etc/shells to open the file) : /bin/false
useradd userftp -p 'mypass' -d /home -s /bin/false
passwd userftp
/etc/init.d/proftpd start
this is for centos