centos7关闭防火墙

systemctl status firewalld查看防火墙状态
systemctl start firewalld 启动防火墙
systemctl stop firewalld 关闭防火墙
systemctl disable firewalld关闭开机自启。

systemctl （系统控制）
查看防火墙是否开启：

[[e-mail] hadoop-2.6.0-cdh5.15.1]$ sudo firewall-cmd --state

停止防火墙：

[[e-mail] hadoop-2.6.0-cdh5.15.1]$ sudo systemctl stop firewall.service