在保存Iptables配置时：systemctl enable iptables.service
出现错误：
Failed to execute operation: No such file or directory
后来去百度，看到一篇文章说，猜到版本过低，更新一下iptables
yum install iptables-services
然后在执行：systemctl enable iptables.service ，完美》
Failed to execute operation: No such file or directory(systemctl enable iptables.service)
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