systemctl start firewalld
firewall-cmd --zone=public --add-port=1935/tcp --permanent
firewall-cmd --zone=public --add-port=1935-8081/tcp --permanent
firewall-cmd --zone=public --remove-port=8080/tcp --permanent
firewall-cmd --zone=public --remove-port=8080-8081/tcp --permanent
firewall-cmd --list-ports
firewall-cmd --reload
firewall-cmd --state
systemctl stop firewalld
systemctl restart firewalld