脚本

1curl -O https://file.tsyvps.com/yumcentos7.sh && chmod +x yumcentos7.sh && ./yumcentos7.sh

手动

备份现有源（可选

1sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

下载阿里云的 yum 源配置文件

1wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

or

1curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

清理缓存

1sudo yum clean all
2sudo yum makecache