添加80端口  重启后永久生效

firewall-cmd --zone=public --add-port=80/tcp --permanent   

查看防火墙状态

systemctl status firewalld.service

启动防火墙

systemctl start firewalld.service

关闭防火墙

systemctl stop firewalld.service

重启防火墙

systemctl restart firewalld.service

禁用防火墙 、 禁止防火墙开机启动

systemctl disable firewalld.service   

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