openstack环境里安装centos6.5系统的虚拟机，安装好后，发现没有/etc/syscofig/iptables防火墙配置文件。
解决办法如下：
[[email protected] ~]# iptables -P OUTPUT ACCEPT
[[email protected] ~]# /etc/init.d/iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
这样，/etc/sysconfig/iptables配置文件就有了
[[email protected] ~]# cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Wed Aug 31 01:14:57 2016
*filter
:INPUT ACCEPT [43:3196]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [23:2380]
COMMIT
# Completed on Wed Aug 31 01:14:57 2016
再补充点其他内容配置：
[[email protected] ~]# cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Wed Aug 31 01:14:57 2016
*filter
:INPUT ACCEPT [43:3196]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [23:2380]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -s 192.168.1.0/24 -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Wed Aug 31 01:14:57 2016
[[email protected] ~]# /etc/init.d/iptables restart
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]
[[email protected] ~]#