开放端口：
[root@WX32 ~]# iptables -I INPUT -p tcp --dport 80 -j ACCEPT

保存配置：
[root@WX32 ~]# service iptables save
Saving firewall rules to /etc/sysconfig/iptables:          [  OK  ]

重启防火墙：
[root@WX32 ~]# 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_netbios_n[  OK  ]

查看配置：
[root@WX32 ~]# service iptables status
Table: filter
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:80
...