CentOS开启某端口

例如：CentOS6.5开启3306端口。

输入命令：

vi /etc/sysconfig/iptables

内容修改成如下：

# 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

输入命令ctrl+c

输入命令：wq (冒号也要输入)

*****************************************扩展************************************************************

如果测试socket连接，需要再打开一个窗口，那就直接增加一个端口号。

-A INPUT -m state –state NEW -m tcp -p tcp –dport 23000 -j ACCEPT

增加完之后需要重启服务：

sudo service iptables restart

重启之后查看端口号打开状态：使用命令

/etc/init.d/iptables status