查看防火墙状态
firewall-cmd –state
启动防火墙
systemctl start firewalld.service
关闭防火墙
systemctl stop firewalld.service
重启防火墙
firewall-cmd –reload
禁止开机启动启动防火墙
systemctl disable firewalld.service
开放3306端口
firewall-cmd –zone=public –add-port=3306/tcp –permanent
查看防火墙开放端口集合
firewall-cmd –zone=public –list-ports
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