在CentOS7中关闭防火墙使用以下命令，

//临时关闭
systemctl stop firewalld
//禁止开机启动
systemctl disable firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

如果安装了iptables-service（执行命令iptables -L -n，如果有结果就表示已经安装），也可以使用下面的命令，

yum install -y iptables-services
//关闭防火墙
service iptables stop
Redirecting to /bin/systemctl stop iptables.service
//检查防火墙状态
service iptables status
Redirecting to /bin/systemctl status iptables.service
iptables.service - IPv4 firewall with iptables
Loaded: loaded (/usr/lib/systemd/system/iptables.service; disabled; vendor preset: disabled)
Active: inactive (dead)