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CentOS报错: Could not resolve host: mirrorlist.centos.org; Unknown error

由于其他错误，执行了 12$ sudo yum clean metadata$ sudo yum clean all 在更新资源时报 123456789101112131415161718192021222324252627Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&am