방화벽 추가
firewall-cmd --permanent --zone=public --add-port=80/tcp
firewall-cmd --permanent --zone=public --add-port=8080/tcp
firewall-cmd --permanent --zone=public --add-port=21/tcp
방화벽 확인
cat /etc/firewalld/zones/public.xml
방화벽 재시작
systemctl restart firewalld