CentOS中防火墙常用的命令

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