一、鏡像源修改
1. 備份原有的鏡像源配置文件
在修改之前，先備份現有的 CentOS-Base.repo 文件：
sudo cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup2. 編輯鏡像源配置文件
使用文本編輯器（如 nano 或 vi）打開 /etc/yum.repos.d/CentOS-Base.repo 文件：
sudo vim /etc/yum.repos.d/CentOS-Base.repo將文件內容替換為以下阿里云鏡像源的配置：
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually pi
)
