查看防火墙状态:
systemctl status firewalld
开启防火墙:
systemctl start firewalld
关闭防火墙:
systemctl stop firewalld
查看某一端口是否开启:
firewall-cmd --query-port=3306/tcp # 查看3306端口是否开启
开启某一端口:
firewall-cmd --zone=public --add-port=3306/tcp --permanent # 开启3306端口
firewall-cmd --reload # 重启防火墙
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