linux命令随笔（2）

LINUX通过下面的命令可以开启允许对外访问的网络端口：

/sbin/iptables -I INPUT -p tcp –dport 8000 -j ACCEPT #开启8000端口

/etc/rc.d/init.d/iptables save #保存配置

/etc/rc.d/init.d/iptables restart #重启服务

查看端口是否已经开放

/etc/init.d/iptables status

装好Tomcat7后，发现除了本机能访问外界访问不了，岂有此理。于是请教百度大神，在费一番周折后，总结步骤如下：

1.修改文件/etc/sysconfig/iptables

[root@bogon ~]# cd /etc/sysconfig/
[root@bogon sysconfig]# vi iptables

文件内容如下，注意红色一行是新加的，目的是对外界开放8080端口

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]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp –icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp –dport 5353 -d 224.0.0.251 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp –dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp –dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 21 -j ACCEPT
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 443 -j ACCEPT
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 8080 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT –reject-with icmp-host-prohibited
-A FORWARD -j REJECT –reject-with icmp-host-prohibited
COMMIT

这行文字实际是从上一行拷贝修改而来，在VI中拷贝一行用yy，拷贝多行用yyn，粘贴用p。还算方便的。

2.将iptables服务重启。

[root@bogon sysconfig]# service iptables restart
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: [ OK ]
Loading additional iptables modules: ip_conntrack_ftp [ OK ]
[root@bogon sysconfig]#