## 1. 备份 ```bash mv /etc/yum.repos.d /etc/yum.repos.d.backup ``` ## 2. 下载阿里云的repo 到/etc/yum.repos.d ``` mkdir /etc/yum.repos.d wget -O /etc/yum.repos.d/CentOS-Base.repo [http://mirrors.aliyun.com/repo/Centos-7.repo](http://mirrors.aliyun.com/repo/Centos-7.repo) ``` ## 3. 清除缓存、生成新的缓存 ``` yum clean all yum makecache ``` ## 4. 安装epel ``` yum install -y epel-release ``` 在/etc/yum.repos.d会生成 epel.repo ## 5. 清除缓存、生成新的缓存 ``` yum clean all yum makecache ```