CentOS 7.0，安裝、啓用、操做iptables防火牆

CentOS 7.0默認使用的是firewall做爲防火牆，這裏改成iptables防火牆。

一、關閉firewall：

systemctl stop firewalld.service #中止firewall

systemctl disable firewalld.service #禁止firewall開機啓動

二、安裝iptables防火牆

service iptables status # 檢查是否安裝了iptables

iptables yum install -y iptables #安裝iptables 

iptables yum update iptables #升級iptables 

iptables-services yum install iptables-services  #安裝iptables-services 

vi /etc/sysconfig/iptables #編輯防火牆配置文件

# 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 #最後重啓防火牆使配置生效

systemctl enable iptables.service #設置防火牆開機啓動

關閉和卸載 iptables

關閉： /etc/init.d/iptables stop

卸載：yum remove iptables