开始

开启防火墙，没有任何反应说明防火墙开启成功
systemctl start firewalld

关闭防火墙
systemctl stop firewalld

查看防火墙状态
systemctl status firewalld
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//添加80端口
firewall-cmd —permanent —zone=public —add-port=80/tcp

//重启、生效
firewall-cmd —reload

//查看开放端口列表
firewall-cmd —permanent —zone=public —list-ports