玩转Linux之- CentOS 7.0,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。 tcp

一、关闭firewall: this

systemctl stop firewalld.service #中止firewall spa

systemctl disable firewalld.service #禁止firewall开机启动 rest

二、安装iptables防火墙 ip

yum install iptables-services #安装 it

vi /etc/sysconfig/iptables #编辑防火墙配置文件 io

# Firewall configuration written by system-config-firewall table

# Manual customization of this file is not recommended. 配置

*filter file

: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

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