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[root@localhost ~]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# mv CentOS-Base.repo CentOS-Base.repo.bak
[root@localhost yum.repos.d]# lsb_release -a
LSB Version:	
Distributor ID:	CentOS
Description:	CentOS Linux release 7.2.1511 (Core) 
Release:	7.2.1511
Codename:	Core
[root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
[root@localhost yum.repos.d]# yum makecache

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[hadoop@localhost yum.repos.d]$ sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo