阿里云

http://mirrors.aliyun.com/help/centos

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

yum clean all

yum makecache

163源

http://mirrors.163.com/.help/centos.html

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo

yum clean all

yum makecache