从Centos7开始默认使用firewall防火墙了
换成iptables防火墙，操作步骤如下：
关闭firewalld防火墙，关闭开机自启
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systemctl stop firewalld.service
systemctl disable firewalld.service
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安装iptables防火墙，设置开机自启
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yum -y install iptables-services net-tools
systemctl enable iptables.service
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然后编辑iptables防火墙规则就好了
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vim /etc/sysconfig/iptables
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来个示例：
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*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
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