Centos6.5配置防火牆

1、查看防火牆狀態

[root@instance-xfl1djr7 ~]# /etc/init.d/iptables status

2、啟動/關閉防火牆

• 開啟防火牆

[root@instance-xfl1djr7 ~]# service iptables start

• 關閉防火牆

[root@instance-xfl1djr7 ~]# service iptables stop

• 開機自啟

開啟： chkconfig iptables on
關閉： chkconfig iptables off

3、開放指定端口

• 比如我要開放3306三個端口，可以在/etc/sysconfig/iptables文件中添加三行信息，如下：

vi /etc/sysconfig/iptables

內容修改成如下：
# 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 3306 -j ACCEPT 

-A INPUT -j REJECT –reject-with icmp-host-prohibited 
-A FORWARD -j REJECT –reject-with icmp-host-prohibited 
COMMIT

• 修改后重啟防火牆

service iptables restart