你好我已经在这个url 链接下载ISO centos 7.x下载了CENTOS 7的最小版本
一切正常...... PING和网络都没问题.我ping外部HOST例如.
但当我数字:
[root@localhost ~]# yum update
Loaded plugins: fastestmirror
One of the configured repositories failed (Unknown),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:
1. Contact the upstream for the repository and get them to fix the problem.
2. Reconfigure the baseurl/etc. for the repository, to point to a working
upstream. …