# 关闭防火墙
systemctl stop firewalld

# 取消开机启动
systemctl disable firewalld

# Cetnos 7 默认已经装了 iptables, 只需装 services 
yum install iptables-services -y

# 打开配置文件
vi /etc/sysconfig/iptables

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

# 重启防火墙使配置生效
systemctl restart iptables

# 设置防火墙开机启动
systemctl enable iptables