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Converting between image formats
Converting images from one format to another is generally straightforward.
qemu-img convert: raw, qcow2, qed, vdi, vmdk, vhd
The qemu-img convert command can do conversion between
multiple formats, including qcow2, qed,
raw, vdi, vhd, and
vmdk.
| Image format | Argument to qemu-img |
|---|---|
| QCOW2 (KVM, Xen) | qcow2 |
| QED (KVM) | qed |
| raw | raw |
| VDI (VirtualBox) | vdi |
| VHD (Hyper-V) | vpc |
| VMDK (VMware) | vmdk |
This example will convert a raw image file named
image.img to a qcow2 image file.
$ qemu-img convert -f raw -O qcow2 image.img image.qcow2Run the following command to convert a vmdk image file to a raw image file.
$ qemu-img convert -f vmdk -O raw image.vmdk image.imgRun the following command to convert a vmdk image file to a qcow2 image file.
$ qemu-img convert -f vmdk -O qcow2 image.vmdk image.qcow2Note
The -f format flag is optional. If omitted,
qemu-img will try to infer the image format.
When converting an image file with Windows, ensure the virtio driver is installed. Otherwise, you will get a blue screen when launching the image due to lack of the virtio driver. Another option is to set the image properties as below when you update the image in glance to avoid this issue, but it will reduce performance significantly.
$ glance image-update --property hw_disk_bus='ide' image_idVBoxManage: VDI (VirtualBox) to raw
If you've created a VDI image using VirtualBox, you can convert it to
raw format using the VBoxManage command-line tool that
ships with VirtualBox. On Mac OS X, and Linux, VirtualBox stores images
by default in the ~/VirtualBox VMs/ directory. The
following example creates a raw image in the current directory from a
VirtualBox VDI image.
$ VBoxManage clonehd ~/VirtualBox\ VMs/image.vdi image.img --format raw