关闭防火墙
#禁用，禁止开机启动： systemctl disable firewalld
#停止运行： systemctl stop firewalld
yum安装iptables
yum -y install iptables-services
启动
systemctl start iptables
配置
vim /etc/sysconfig/iptables
开机启动iptables
systemctl enable iptables
systemctl stop iptables
systemctl start iptables
systemctl restart iptables
systemctl reload iptables