CentOS 防火墙常用命令

firewall-cmd --zone=public --add-port=21/udp --permanent;

firewall-cmd --zone=public --remove-port=6379/tcp --permanent

firewall-cmd --zone=public --list-ports

firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="172.23.41.64" port protocol="tcp" port="8848" accept"

firewall-cmd --reload

重启一个服务：
systemctl status firewalld
systemctl restart firewalld.service