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 https://mirrors.aliyun.com/repo/Centos-6.repo

#替换版本，$releasever替换6.8, 6.8是我用的版本sed -i  's/$releasever/6.8/g' /etc/yum.repos.d/CentOS-Base.repo#替换centos为centos-vaultsed -i  's/centos/centos-vault/g' /etc/yum.repos.d/CentOS-Base.repo

sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.reposed -i  's/http/https/g' /etc/yum.repos.d/CentOS-Base.repo

yum makecache