linux开放关闭防火墙端口

1. 重启后生效
   开启： chkconfig iptables on
   关闭： chkconfig iptables off

2. 即时生效，重启后失效
   开启： service iptables start
   关闭： service iptables stop

查看iptables文件
vim /etc/sysconfig/iptables

redhat部分-----------
1：端口开放

/sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT

2：保存修改

/etc/rc.d/init.d/iptables save

3: 重启服务

/etc/rc.d/init.d/iptables restart

4：查看端口状态

/etc/init.d/iptables status

结果如下

Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp – 0.0.0.0/0 0.0.0.0/0 tcp dpt:2181
2 ACCEPT tcp – 0.0.0.0/0 0.0.0.0/0 tcp dpt:6379
3 ACCEPT tcp – 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080
4 ACCEPT all – 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
5 ACCEPT icmp – 0.0.0.0/0 0.0.0.0/0
6 ACCEPT all – 0.0.0.0/0 0.0.0.0/0
7 ACCEPT tcp – 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
8 REJECT all – 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 REJECT all – 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination

5：删除端口（2表示上面的num列）

/sbin/iptables -D INPUT 2