一、安装wget

执行： yum install -y wget

[root@local ~] yum install -y wget

二、下载CentOS 7的repo文件

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

●或者

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

●更新镜像源

●清除缓存yum clean all

●生成缓存yum makecache

[root@local ~]# yum clean all

[root@local ~]# yum makecache