目录
说明
Linux虚拟机软件选择
最小化安装
网卡
ens33
报错内容
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; 未知的错误"
One of the configured repositories failed (未知),
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. Run the command with the repository temporarily disabled
yum --disablerepo=<repoid> ...
4. Disable the repository permanently, 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>
or
subscription-manager repos --disable=<repoid>
5. 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
报错原因
Linux虚拟机虚拟网络设置出错
解决方案
方案一
修改网卡为动态IP
vi /etc/sysconfig/network-scripts/ifcfg-ens33 
保存退出后重启网卡
service network restart现在可以使用yum命令了
使用完yum命令后记得将动态网卡修改回静态网卡，方便后期操作
方案二
方案一无效的情况下可以使用方案二彻底解决
重置虚拟机虚拟网络设置
重置完虚拟网络设置后，网关地址会发生变化，记得修改/etc/hosts映射地址与/etc/sysconfig/network-scripts/ifcfg-ens33中的ip、网关地址