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

完整报错：

Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
Invalid configuration value: failovermethod=priority in /etc/yum.repos.d/CentOS-Base.repo; 配置：ID 为 "failovermethod" 的 OptionBinding 不存在
CentOS-8 - Base - mirrors.aliyun.com                      0.0  B/s |   0  B     00:47    
Errors during downloading metadata for repository 'base':
  - Status code: 404 for https://mirrors.aliyun.com/centos/8/BaseOS/x86_64/os/repodata/repomd.xml (IP: 120.39.197.216)
  - 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]
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

在网上找了很多资料都没用，最后在镜像站找到了原因：

是因为我之前配置阿里云镜像指令错了，以前是这样的：

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo

因此解决方案为：

# 进入yum目录
cd /etc/yum.repos.d

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

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

# 生成缓存
yum makecache

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