CentOS 7.0，安装、启用、操做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。

一、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

service iptables status # 检查是否安装了iptables

iptables yum install -y iptables #安装iptables 

iptables yum update iptables #升级iptables 

iptables-services yum install iptables-services  #安装iptables-services 

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 -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

关闭和卸载 iptables

关闭： /etc/init.d/iptables stop

卸载：yum remove iptables