前言
天翼云服务器安装 centos7.9 使用yum命令报错，使用yum命令，报错信息如下：
[root@ecm-xxx mysql-8.0.34]# yum -y update
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
epel/x86_64/metalink | 5.1 kB 00:00:00 * epel: ftp-stud.hs-esslingen.de
https://mirrors.tuna.tsinghua.edu.cn/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
正在尝试其它镜像。
To address this issue please refer to the below wiki article https://wiki.centos.org/yum-errorsIf above article doesn't help to resolve this issue please use https://bugs.centos.org/.One of the configured repositories failed (CentOS-7 - Base),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=base ...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 baseorsubscription-manager repos --disable=base5. 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=base.skip_if_unavailable=truefailure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
https://mirrors.tuna.tsinghua.edu.cn/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
问题原因
centos7在2024年6月30日，生命周期结束，官方不再进行支持维护，官方的YUM源也下线了，下线的方式是使yum的域名不解析。所以现在需要配置国内的YUM源。
解决办法
1. 编辑 CentOS-Base.repo
sudo vim /etc/yum.repos.d/CentOS-Base.repo
2. 将下文信息替换原有内容
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/ http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 #released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/ http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 #additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/ http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/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=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/ http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 #contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
baseurl=http://mirrors.aliyun.com/centos/$releasever/contrib/$basearch/ http://mirrors.tuna.tsinghua.edu.cn/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 # 使用failovermethod指定优先级，这里设置为随机（roundrobin），也可以改为priority并指定每个URL的优先级
failovermethod=roundrobin
3. 清理YUM缓存并更新
sudo yum clean all
sudo yum makecache
sudo yum update