安装最小化的CentOS7后，执行yum命令报错Could not resolve host mirrorlis ...

安装最小化的CentOS7后，执行yum命令报错"Could not resolve host: mirrorlist.centos.org; 未知的错误"

错误

1. [root@anonymous yum.repos.d]# yum list lrzsz
2. 已加载插件：fastestmirror, langpacks
3. Loading mirror speeds from cached hostfile
4. Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
5. 14: curl#6 - "Could not resolve host: mirrorlist.centos.org; 未知的错误"
8. One of the configured repositories failed (未知),
9. and yum doesn't have enough cached data to continue. At this point the only
10. safe thing yum can do is fail. There are a few ways to work "fix" this:
12.      1. Contact the upstream for the repository and get them to fix the problem.
14.      2. Reconfigure the baseurl/etc. for the repository, to point to a working
15.         upstream. This is most often useful if you are using a newer
16.         distribution release than is supported by the repository (and the
17.         packages for the previous distribution release still work).
19.      3. Run the command with the repository temporarily disabled
20.             yum --disablerepo=<repoid> ...
22.      4. Disable the repository permanently, so yum won't use it by default. Yum
23.         will then just ignore the repository until you permanently enable it
24.         again or use --enablerepo for temporary usage:
26.             yum-config-manager --disable <repoid>
27.         or
28.             subscription-manager repos --disable=<repoid>
30.      5. Configure the failing repository to be skipped, if it is unavailable.
31.         Note that yum will try to contact the repo. when it runs most commands,
32.         so will have to try and fail each time (and thus. yum will be be much
33.         slower). If it is a very temporary problem though, this is often a nice
34.         compromise:
36.             yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
38. Cannot find a valid baseurl for repo: base/7/x86_64

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办理方案：

（确保可以或许ping通114.114.114.114）
1.更新base.repo源
1.11备份文件

1. mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

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1.12下载新的CentOS-Base.repo 到/etc/yum.repos.d/

1. wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

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1.13运行yum makecache生成缓存

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