vi /etc/sysconfig/iptables
-A INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT（允許80端口通過防火牆）
-A INPUT -m state –state NEW -m tcp -p tcp –dport 3306 -j ACCEPT（允許3306端口通過防火牆）
特別提示：很多網友把這兩條規則添加到防火牆配置的最後一行，導致防火牆啟動失敗，正確的應該是添加到默認的22端口這條規則的下面
添加好之後防火牆規則如下所示：
復制代碼代碼如下:
# 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 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
/etc/init.d/iptables restart
#最後重啟防火牆使配置生效
