关闭firewall：

systemctl stop firewalld.service#停止firewall

systemctl disable firewalld.service#禁止firewall开机启动

yum install iptables-services#安装iptables

vi /etc/sysconfig/iptables#编辑防火墙配置文件

# Firewall configuration written by system-config-firewall

# Manual customization of this file is not recommended.

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

:wq!#保存退出

systemctl start iptables.service#启动防火墙

systemctl stop iptables.service#停止防火墙

systemctl restart iptables.service#重启防火墙

systemctl status iptables.service#查看防火墙状态

systemctl enable iptables.service#设置开机启动