CentOS 6/7关闭防火墙命令

service iptables stop //临时关闭
chkconfig iptables off //禁止开机启动

stop iptables.service 
Failed to stop iptables.service: Unit iptables.service not loaded.

systemctl stop firewalld //临时关闭

systemctl disable firewalld //禁止开机启动

Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.

Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

yum install -y iptables-services //安装iptables-services
service iptables stop //关闭防火墙
service iptables status //检查防火墙状态