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yum install wget

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

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
 
yum clean all
 
yum makecache