virsh snapshot-create as k8s-m1 20190317
virsh snapshot-list k8s-m1
或者
qemu-img info /opt/kvm/images/k8s-m1.qcow2
virsh snapshot-revert k8s-m1 20190317
kvm创建快照与还原
原文：https://blog.51cto.com/lingxudong/2364270
