CentOS报错：There are no enabled repos

在使用yum安装软件的时候报了下面的错误：

Loading mirror speeds from cached hostfile
There are no enabled repos.Run "yum repolist all" to see the repos you have.To enable Red Hat Subscription Management repositories:subscription-manager repos --enable <repo>To enable custom repositories:yum-config-manager --enable <repo>

解决方案：
去网站下载对应版本repo文件, 放入/etc/yum.repos.d/里

https://mirrors.aliyun.com/centos/

生成缓存

yum clean all
yum makecache

结果报以下错

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 onlysafe 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 workingupstream. This is most often useful if you are using a newerdistribution release than is supported by the repository (and thepackages for the previous distribution release still work).3. Run the command with the repository temporarily disabledyum --disablerepo=<repoid> ...4. Disable the repository permanently, so yum won't use it by default. Yumwill then just ignore the repository until you permanently enable itagain or use --enablerepo for temporary usage:yum-config-manager --disable <repoid>orsubscription-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 muchslower). If it is a very temporary problem though, this is often a nicecompromise:yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=trueCannot find a valid baseurl for repo: CentOS-Base/x86_64

然后去看了一下网卡配置发现dns不知道怎么没有了
解决方案：补上dns

vim /etc/resolv.conf#添加以下内容
nameserver 8.8.8.8

然后重新生成缓存

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