qcow2快照操做

1. 查看虛擬機快照
   virsh snapshot-list vmname
2. 查看快照的詳細信息
   virsh snapshot-info vmname snapname
3. 建立內部快照
   virsh snapshot-create-as vmname snapname
4. 建立帶內存內部快照
   virsh snapshot-create-as --migrate vmname snapname
5. 建立外部快照
   virsh snapshot-create-as vmname snapname --no-metadata --disk-only --atomic
6. commit到base鏡像
   virsh blockcommit vmname vda --verbose --pivot --active
   7.pull到top鏡像
   virsh blockpull vmname vda --wait --verbose
7. 在線rebase
   virsh qemu-monitor-command vmname '{"execute": "drive-backup", "arguments":{"device":"drive-virtio-disk0", "sync":"full", "target":"/path/imagename", "format":"qcow2"}}'
8. 離線rebaseqemu-img rebase -u -b /path/base /path/top