背景

CentOS 8 已在 2021 年底结束支持，CentOS 7 由于用户基数与用户贡献较多，因此会按照计划维护至生命周期结束即 2024 年 6 月 30 日

解决办法

使用centos-vault作为停止支持的CentOS的yum源, 国内还有很多centos镜像网站,例如,阿里云，清华源、中科大、上海交大、电子科大源等等。系统版本可以通过执行cat /etc/redhat-release命令查看, 我的系统是CentOS 8.3.2011 决定选用清华源镜像, 官方说明文档: https://mirrors.tuna.tsinghua.edu.cn/help/centos-vault

• 备份repo文件到当前目录

  cp -r  /etc/yum.repos.d ./
  

• 修改CentOS-Base.repo, 可以将8.3.2011替换成自己的版本号

  cat > /etc/yum.repos.d/CentOS-Base.repo << "EOF"
  
  # CentOS-Base.repo
  #
  # The mirror system uses the connecting IP address of the client and the
  # update status of each mirror to pick mirrors that are updated to and
  # geographically close to the client.  You should use this for CentOS updates
  # unless you are manually picking other mirrors.
  #
  # If the mirrorlist= does not work for you, as a fall back you can try the
  # remarked out baseurl= line instead.
  #
  #
  
  [base]
  name=CentOS-$releasever - Base
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
  baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/8.3.2011/BaseOS/$basearch/os/
  
  #additional packages that may be useful
  [extras]
  name=CentOS-$releasever - Extras
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
  baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/8.3.2011/extras/$basearch/os
  gpgcheck=1
  gpgkey=https://mirrors.tuna.tsinghua.edu.cn/centos/RPM-GPG-KEY-CentOS-Official
  
  #additional packages that extend functionality of existing packages
  [centosplus]
  name=CentOS-$releasever - Plus
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
  baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/8.3.2011/centosplus/$basearch/os
  gpgcheck=1
  enabled=1
  gpgkey=https://mirrors.tuna.tsinghua.edu.cn/centos/RPM-GPG-KEY-CentOS-Official
  
  #additional packages that extend functionality of existing packages
  [AppStream]
  name=CentOS-$releasever - AppStream
  #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
  baseurl=https://mirrors.tuna.tsinghua.edu.cn/centos-vault/8.3.2011/AppStream/$basearch/os
  gpgcheck=1
  enabled=1
  gpgkey=https://mirrors.tuna.tsinghua.edu.cn/centos/RPM-GPG-KEY-CentOS-Official
  
  EOF
  

• 执行yum makecache -y 更新软件包缓存, 如果有报错的话可以删掉/etc/yum.repos.d/下面的其他repo文件只保留/etc/yum.repos.d/CentOS-Base.repo 这一个repo文件