centos更换清华镜像源

要将CentOS更换为清华镜像源，你可以按照以下步骤进行操作：

1. 首先，备份CentOS-Base.repo文件。在终端中执行以下命令：

sudo cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo-old

这将在同一目录下创建一个名为CentOS-Base.repo-old的备份文件。这是为了防止出现问题时可以恢复原始配置。引用<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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