CentOS 更换 YUM 镜像源

1. 安装 wget

type wget
# 如果找不到wget命令，需要先安装
yum -y install wget

2. 备份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

3. 下载

# CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
# CentOS 8
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo

4. 生成缓存

# 清除缓存
yum clean all
# 生成缓存，建立元数据
yum makecache

参考：https://developer.aliyun.com/...