linux开放指定端口

方式1:
/sbin/iptables -I INPUT -p tcp --dport 8011 -j ACCEPT #开启8011端口

/etc/rc.d/init.d/iptables save #保存配置 /etc/rc.d/init.d/iptables restart #重启服务
/etc/init.d/iptables status #查看端口已经开放

方式2:
vi /etc/sysconfig/iptables

-A INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT
(允许80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:

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

*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 -j REJECT –reject-with icmp-host-prohibited
-A FORWARD -j REJECT –reject-with icmp-host-prohibited
COMMIT
#######################################

/etc/init.d/iptables restart #最后重启防火墙使配置生效

转载:https://www.cnblogs.com/de0319gh/p/3791947.html

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