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