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Docs/Centos7更换阿里源.md

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+> 本文作者：丁辉
+
+# Centos7更换阿里源
+
+1. 备份本地Yum源
+
+   ```bash
+   mkdir -p /etc/yum.repos.d/backup/
+   mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/backup/
+   ```
+
+2. 下载阿里云Yum源
+
+   ```bash
+   curl -O http://mirrors.aliyun.com/repo/Centos-7.repo
+   curl -O http://mirrors.aliyun.com/repo/epel-7.repo
+   ```
+
+3. *删除缓存数据*
+
+   ```bash
+   yum clean all
+   ```
+
+4. *创建元数据缓存*
+
+   ```bash
+   yum makecache
+   ```
+
+