当做虚拟机备份快照时,镜像的大小一般会大于实际数据大小,you'll need to zero out all free space of the partitions contained within the guest first.
参考维基百科:https://pve.proxmox.com/wiki/Shrin_Qcow2_Disk_Files
针对linux镜像:
尽量删除一些无用文件
dd if=/dev/zero of=/mytempfile
# that could take a some time
rm -f /mytempfile
mv image.qcow2 image.qcow2_backup
qemu-img convert -O qcow2 image.qcow2_backup image.qcow2
qemu-img convert -O qcow2 -c image.qcow2_backup image.qcow2
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