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centos8报错：Errors during downloading metadata for repository ‘base‘

perll
2022/05/29 22:31:44
  1. Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
  2. Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
  3. Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
  4. Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
  5. Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
  6. CentOS-8 - Base - mirrors.aliyun.com                      0.0  B/s |   0  B     00:47   
  7. Errors during downloading metadata for repository 'base':
  8.   - Status code: 404 for https://mirrors.aliyun.com/centos/8/BaseOS/x86_64/os/repodata/repomd.xml (IP: 120.39.197.216)
  9.   - Curl error (7): Couldn't connect to server for http://mirrors.aliyuncs.com/centos/8/BaseOS/x86_64/os/repodata/repomd.xml [Failed to connect to mirrors.aliyuncs.com port 80: 拒绝连接]
  10. 错误：为仓库 'base' 下载元数据失败 : Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
是因为我之前配置阿里云镜像指令错了，以前是这样的：
  1. wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo
解决办法
  1. # 进入yum目录
  2. cd /etc/yum.repos.d

  4. # 删除目录下所有文件(注意完整复制，不要漏了那个点)
  5. rm -rf ./*

  7. # 安装正确的源
  8. wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo

  10. # 生成缓存
  11. yum makecache

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