cd /etc/yum.repos.d/
    vim /etc/yum.repos.d/aliBase.repo

    1. [Base]
    2. name=aliBase
    3. baseurl=https://mirrors.aliyun.com/centos/$releasever/os/$basearch/
    4. enabled=1
    5. gpgcheck=1
    6. gpgkey=https://mirrors.aliyun.com/centos/$releasever/os/$basearch/RPM-GPG-KEY-CentOS-$releasever

    vim /etc/yum.repos.d/aliEpel.repo

    [aliEpel]
name=aliEpel
baseurl=https://mirrors.aliyun.com/epel/$releasever\Server/$basearch/
enabled=1
gpgcheck=0

    yum clean all （清除Yum源缓存）
    yum makecache