centos7 关闭firewall安装iptables

默认情况下暴力关闭防火墙：
sudo iptables -F
以下为正确方式：参考http://www.open-open.com/lib/view/open1411818940031.html
卸载默认防火墙firewall，安装iptables

关闭firewall：

sudo systemctl stop firewalld.service #停止firewall
sudo systemctl disable firewalld.service #禁止firewall开机启动

安装iptables防火墙

sudo yum install iptables-services #安装
sudo vim /etc/sysconfig/iptables #编辑防火墙配置文件

修改内容如下

# 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
# 开启80,3306 端口
[color=green]-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT[/color]
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

:wq #保存退出

sudo systemctl restart iptables.service #最后重启防火墙使配置生效
sudo systemctl enable iptables.service #设置防火墙开机启动 

reboot 即可。