1)先安装wget 

执行命令 yum install -y wget

[root@localhost ~]# yum install -y wget

2) 查询国内镜像源

打开阿里镜像http://mirrors.aliyun.com/

3）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@localhost ~]# yum clean all

Loaded plugins: fastestmirror

Cleaning repos: base extras updates

Cleaning up everything

Cleaning up list of fastest mirrors

[root@localhost ~]# yum makecache

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