linux常用防火墙firewalld

习惯用firewalld，基本指令：

//安装

yum install firewalld

//放行

sudo firewall-cmd --zone=public --add-port=6666/tcp --permanent

//重加载

sudo firewall-cmd --reload

//启动

sudo systemctl start firewalld

//停止

sudo systemctl status firewalld

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