centos7虚拟机镜像地址出问题了

问题很简单，网上办法多，都没有解决。

原本每次用最小安装创建ceentos7虚拟机后，习惯性运行yum install -y epel-release
yum install -y psmisc nc net-tools rsync vim lrzsz ntp libzstd openssl-static tree iotop git来安装基本命令。每次都如此，也总是没有出现问题。从昨天2024年7月4日，创建一个虚拟机后，运行上面第一个命令，出现如下错误：

[root@hadoop101 ~]# yum install -y epel-release

已加载插件：fastestmirror, langpacks

Loading mirror speeds from cached hostfile

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=updates&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: updates/7/x86_64

yum命令使用出问题了

网上查找，各种设置都没有搞定。当然高手一看就是镜像文件地址问题。当时也是第一感觉，但被网上各种解决，尝试多种方法，都没有结果。最后就按照第一感觉，修改新的镜像地址，问题自然就解决了。

解决方法就一步

就一步操作：编辑

/etc/yum.repos.d/

目录下的repo配置文件CentOS-Base.repo将镜像服务器地址修改为阿里云。

[base]

name=CentOS-$releasever - Base baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[updates]

name=CentOS-$releasever - Updates baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[extras]

name=CentOS-$releasever - Extras baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[centosplus]

name=CentOS-$releasever - Plus baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

保存退出后

yum clean all

yum makecache

问题就全部解决了。