Loaded plugins: fastestmirror, langpacks
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. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).
3. Disable the repository, so yum won't use it by default. Yum will then
just ignore the repository until you permanently enable it again or use
--enablerepo for temporary usage:
yum-config-manager --disable <repoid>
4. Configure the failing repository to be skipped, if it is unavailable.
Note that yum will try to contact the repo. when it runs most commands,
so will have to try and fail each time (and thus. yum will be be much
slower). If it is a very temporary problem though, this is often a nice
compromise:
yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
Cannot find a valid baseurl for repo: base/7/x86_64
难道是虚拟机没有网络访问权限,先【ping www.baidu.com】试一下
网络访问权限没有问题,那问题可能是CentOS的yum源的问题,下载一个能访问的yum源放到【/etc/yum.repos.d/】目录下,例如阿里的:
curl -o /etc/yum.repos.d/CentOS-Base-Ali.repo
http://mirrors.aliyun.com/repo/Centos-7.repo
运行【yum makecache】生成缓存
查找镜像正常。
【附】加入163的yum源
curl -o /etc/yum.repos.d/CentOS-Base-163.repo
https://mirrors.163.com/.help/CentOS7-Base-163.repo