在centos7.0默認(rèn)使用firewalld服務(wù)，若萱使用iptables，需要禁用firewalld并啟動(dòng)iptables
systemctl stop firewalld
systemctl disable firewalld
安裝 iptables
yum install iptables-services
systemctl enbale iptables
cp /usr/libexec/iptables/iptables.init /etc/init.d/iptables
service iptables save
service iptables stop
service iptables start
systemctl stop iptables
systemctl start iptables
