一、备份repo文件

mkdir ~/yum.repos.bak
mv /etc/yum.repos.d/* ~/yum.repos.bak/

二、导入aliyun repo

cd /etc/yum.repos.d
curl -o CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo  
# CentOS 7
curl -o CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo 
# CentOS 8

三、安装ELRepo

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum install -y https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm 
 # CentOS 7
yum install -y https://www.elrepo.org/elrepo-release-8.1-1.el8.elrepo.noarch.rpm  
# CentOS 8

四、刷新yum缓存

yum clean all && yum makecache