centos7.0 防火墙端口授权、开启、查看

1.firewall-cmd --zone=public --add-port=3306/tcp --permanent 开启3306端口(permanent:永久)
2.systemctl status firewalld 查看 firewalld 状态
3.systemctl start firewalld 开启 firewalld
4.firewall-cmd --reload 重新载入
4.firewall-cmd --zone=public --query-port=3306/tcp 查看端口
5.firewall-cmd --zone=public --remove-port=80/tcp --permanent 删除
6.systemctl stop firewalld 关闭 firewalld