应用命令 systemctl start iptables 开启防火墙, 涌现以下毛病.
Failed to start iptables.service: Unit iptables.service failed to load: No such file or directory.Fa
阅读背景：
redhat7.6yum[Errno14]curl#37-"Couldn'topenfile/mnt/repodata/repomd.
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