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yum 安装出现错误如下：
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=genclo error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Name or service not known"
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. 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原因
看报错日志，ping mirrorlist.centos.org 不通。试着 ping www.baidu.com 是正常的，说明 DNS 解析没问题。
2024 年 7 月 1 日，CentOS 7 终止使用，CentOS 团队已将其存储库移至 的存档 vault.centos.org。如果不更新存储库 URL，则无法更新或验证软件包，从而导致这些错误。
CentOS7 更换镜像源
1、先安装 wget
yum install -y wget
2、下载 CentOS 7 的对应的 repo 文件
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
#或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo3、更新镜像源
yum clean all
yum makecache
yum -y update执行完上面三行命令就好了
以上内容原文链接：https://blog.csdn.net/masound/article/details/140123479
另外查到的资料也是 2024 年 7 月 1 号后 CentOS 7 终止使用引起的问题，也可以按以下教程修改 yum 源，未尝试过，可自行尝试，上面的方法已试过，成功解决了该问题。
Symptoms
When running various functions such as MultiPHP or command that utilize the yum system, errors similar to the following are produced:
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; Name or service not known"
Description
On July 1st 2024 CentOS 7 is End of Life and the CentOS team has removed their mirrors from the internet. They can still be accessed via vault.centos.org. Without updating the repository URLs, packages will be unable to be updated or validated, resulting in the error above.
IMPORTANT: Using the CentOS vault repository IS NOT to be used for staying on CentOS 7 for any longer than is required to migrate to a new server. Packages provided by the vault repository do not get any updates. This means that the software installed from the Vault repository will have unpatched security vulnerabilities and other defects.
Workaround
cPanel has released the following autofixer to enable the CentOS 7 Vault repository automatically for you:
/scripts/autorepair centos7_base_repo_is_no_moreNote: The above script will only correct servers with the repo file set as CentOS-Base.repo, systems using custom repositories will need to edit the repo file to use vault.centos.org using the manual steps below.
Manual Steps:
If you are using a custom CentOS 7 base repository, then please follow these manual steps:
- Copy the current CentOS 7 repository file so that you can revert the changes if necessary:
cp -v /etc/yum.repos.d/CentOS-Base.repo{,-backup}Note: Your CentOS 7 base repository may have a different name. The above filename “CentOS-Base.repo” is only used as an example.
- Edit the
/etc/yum.repos.d/CentOS-Base.repofile using a command line text editor - Paste in the following configuration:
[base] name=CentOS-$releasever - Base baseurl=https://vault.centos.org/7.9.2009/os/$basearch gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 #released updates [updates] name=CentOS-$releasever - Updates baseurl=https://vault.centos.org/7.9.2009/updates/$basearch gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 #additional packages that may be useful [extras] name=CentOS-$releasever - Extras baseurl=https://vault.centos.org/7.9.2009/extras/$basearch gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus baseurl=https://vault.centos.org/7.9.2009/centosplus/$basearch gpgcheck=1 enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 - Save the file and exit
- Run the following commands:
yum clean all && yum makecache原文 https://support.cpanel.net/hc/en-us/articles/24571139547415-Could-not-retrieve-mirrorlist-http-mirrorlist-centos-org-on-CentOS-7
