环境异常解决方案-CentOS安装软件包找不到镜像

  今天准备搭建一套Docker环境，先安装了一个CentOS 7.2的虚拟机，然后使用【yum】命令来装其他的软件包，出现了如下消息： Loaded plugins: fastestmirror, langpacks One of the configured repositories failed (Unknown), and yum doesn't have enough cach

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