yum install vsftpd

systemctl start vsftpd

modprobe nf_conntrack_ftp

iptables -F

iptables -A INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT

iptables -A INPUT -p tcp –dport 21 -m state –state NEW -j ACCEPT

iptables -A OUTPUT -m state –state ESTABLISHED -j ACCEPT

iptables -P INPUT DROP

iptables -P OUTPUT DROP

iptables –vnL