Linux學習之八--關閉firewall防火牆安裝iptables並配置

　　CentOS 7以後默認使用的是firewall做爲防火牆，這裏改成iptables防火牆,並開啓80端口、3306端口。

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

yum install iptables-services #安裝

vi /etc/sysconfig/iptables #編輯防火牆配置文件

內容爲：

# 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 8888 -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport 9999 -j ACCEPT

-A INPUT -m state --state NEW -m tcp -p tcp --dport 21 -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

三、重啓、開機啓動iptables

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