Linux配置防火牆，開啓80端口、3306端口

防火牆配置有關介紹。

1、編輯防火牆配置

vi /etc/sysconfig/iptables

-A INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT（容許80端口經過防火牆） 
-A INPUT -m state –state NEW -m tcp -p tcp –dport 3306 -j ACCEPT（容許3306端口經過防火牆）

特別提示：不少網友把這兩條規則添加到防火牆配置的最後一行，致使防火牆啓動失敗，正確的應該是添加到默認的22端口這條規則的下面

添加好以後防火牆規則以下所示：

###################################### 
# 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 
#####################################

2、重啓

最後重啓防火牆使配置生效

/etc/init.d/iptables restart