CentOS7启用iptables防火墙

CentOS 7.0默认使用的是firewall做为防火墙，这里改成iptables防火墙。

1. 关闭firewall：

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

二、安装iptables防火墙

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

文件修改以下:

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