vim /etc/yum.repos.d/CentOS-OpenStack-rocky.repo
[centotack-rocky]
name=openstack-rocky
baseurl=https://mirrors.aliyun.com/centos/7/cloud/x86_64/openstack-rocky/
enabled=1
gpgcheck=0
[qume-kvm]
name=qemu-kvm
baseurl= https://mirrors.aliyun.com/centos/7/virt/x86_64/kvm-common/
enabled=1
gpgcheck=0
原文:https://www.cnblogs.com/zHQQQQ/p/12487499.html