Install vsftpd
anonymous_enable=NO
local_enable=YES
userlist_enable=YES
userlist_deny=NO
userlist_file=/etc/vsftpd.user_list
ftpuser
/bin/false
sudo mkdir -p /home/ftp/ftpuser
sudo useradd ftpuser -d /home/ftp/ftpuser -s /bin/false
sudo passwd ftpuser