yum自動補全
yum install bash-completion -y
阿里雲官方鏡像站
https://developer.aliyun.com/mirror/
添加yum軟件倉庫
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
或者
sudo yum-config-manager --add-repo=http://classroom.example.com/