阿里 YUM 地址

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup  

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

或者

curl http://mirrors.aliyun.com/repo/Centos-7.repo > /etc/yum.repos.d/centos.repo

sudo yum clean all

sudo yum makecache

测试
yum -y install zip