## 安装wget ```bash yum install -y wget ``` ## 完事前都做备份 ```bash mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup ``` ## 下载阿里云镜像文件 ```bash wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo ``` ## 清理缓存 ```bash yum clean all ``` ## 生成缓存 ```bash yum makecache ``` ## 更新最新源设置 ```bash yum update -y