我出现这种错误是因为网络链接问题，因为我设置虚拟机网络链接为VmNET8，设置了nat模式，使得我本地机可以访问虚拟机的linux服务器。但是打开虚拟机的浏览器却不能上网了。所以现在我用xshell装数据库出现了这个问题。然后将刚才的这个nat模式设置先移除后就能上网了。
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yum install 报错[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml
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