Linux配置防火墙 开启80端口、3306端口的方法

vi /etc/sysconfig/iptables

-A INPUT -m state �Cstate NEW -m tcp -p tcp �Cdport 80 -j ACCEPT（允许80端口通过防火墙）

-A INPUT -m state �Cstate NEW -m tcp -p tcp �Cdport 3306 -j ACCEPT（允许3306端口通过防火墙）

特别提示：很多网友把这两条规则添加到防火墙配置的最后一行，导致防火墙启动失败，正确的应该是添加到默认的22端口这条规则的下面

添加好之后防火墙规则如下所示：

# 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 �Cstate ESTABLISHED,RELATED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

-A INPUT -m state �Cstate NEW -m tcp -p tcp �Cdport 22 -j ACCEPT

-A INPUT -m state �Cstate NEW -m tcp -p tcp �Cdport 80 -j ACCEPT

-A INPUT -m state �Cstate NEW -m tcp -p tcp �Cdport 3306 -j ACCEPT

-A INPUT -j REJECT �Creject-with icmp-host-prohibited

-A FORWARD -j REJECT �Creject-with icmp-host-prohibited

COMMIT

/etc/init.d/iptables restart

#最后重启防火墙使配置生效