最近在centos7下，搭建ftp服務，按照步驟一步一步來，發現 etc/sysconfig/iptables這個檔案並不存在，然後去找解決方案，

原文地址：http://blog.csdn.net/iamzhangyouzhi/article/details/41978537

解決辦法：

1. 隨便寫一條iptables命令配置個防火牆規則。如：iptables -P OUTPUT ACCEPT。

[[email protected] /]# cd /etc/sysconfig/
[[email protected] sysconfig]# iptables -P OUTPUT ACCEPT

2. service iptables save進行儲存。

[[email protected] sysconfig]# service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[  OK  ]
[[email protected] sysconfig]# ls
atd         firstboot         iptables-config  networking       readonly-root  sshd
auditd      grub              irqbalance       network-scripts  rhn            sysstat
authconfig  htcacheclean      kdump            ntpd             rngd           sysstat.ioconf
cbq         httpd             kernel           ntpdate          rsyslog        system-config-firewall
clock       i18n              keyboard         prelink          sandbox        system-config-firewall.old
console     init              modules          quota_nld        saslauthd      udev
cpuspeed    ip6tables-config  netconsole       raid-check       selinux
crond       iptables          network          readahead        smartmontools
[
 
[email protected] sysconfig]# 

3. service iptables restart命令重啟：

[[email protected] sysconfig]# service 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] sysconfig]# 

原文地址：http://blog.163.com/xavier_666/blog/static/25884000720163299503423/