Centos6默认iptables配置文件
出现一批安装完centos的镜像iptables无法启动，warning
解决办法办法：
1.随便写一条iptables命令配置个防火墙规则，生成iptables文件
如：iptables -P OUTPUT ACCEPT
2.service iptables save保存
3.修改/etc/sysconfig/iptables配置文件如下：
4.重启即可service iptables restart
-------------------------------------------
# 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 -j REJECT --reject-with icmp-host-prohibited
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT