failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.http://mirrors.163.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.163.com; Unknown error
yum源问题,参考:https://blog.csdn.net/Homewm/article/details/80642851
yum安装?DNS配置报错,dns没有配置?
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