The nova.virt.libvirt.imagebackend Module

class Backend(use_cow)

Bases: object

backend(image_type=None)

image(instance, disk_name, image_type=None)

Constructs image for selected backend

Instance :Instance name. Name :Image name. Image_type :Image type.

Optional, is CONF.libvirt_images_type by default.

snapshot(disk_path, snapshot_name, image_type=None)

Returns snapshot for given image

Path :path to image Snapshot_name :snapshot name Image_type :type of image

class Image(source_type, driver_format, is_block_dev=False)

Bases: object

cache(fetch_func, filename, size=None, *args, **kwargs)

Creates image from template.

Ensures that template and image not already exists. Ensures that base directory exists. Synchronizes on template fetching.

Fetch_func :Function that creates the base image Should accept target argument. Filename :Name of the file in the image directory Size :Size of created image in bytes (optional)

create_image(prepare_template, base, size, *args, **kwargs)

Create image from template.

Contains specific behavior for each image type.

Prepare_template :  function, that creates template.

Should accept target argument. :base: Template name :size: Size of created image in bytes

libvirt_info(disk_bus, disk_dev, device_type, cache_mode, extra_specs)

Get LibvirtConfigGuestDisk filled for this image.

Disk_dev :Disk bus device name Disk_bus :Disk bus type Device_type :Device type for this image. Cache_mode :Caching mode for this image Extra_specs :Instance type extra specs dict.

snapshot_create()

snapshot_delete()

snapshot_extract(target, out_format)

class Lvm(instance=None, disk_name=None, path=None, snapshot_name=None)

Bases: nova.virt.libvirt.imagebackend.Image

create_image(prepare_template, base, size, *args, **kwargs)

static escape(filename)

remove_volume_on_error(*args, **kwds)

snapshot_create()

snapshot_delete()

snapshot_extract(target, out_format)

class Qcow2(instance=None, disk_name=None, path=None, snapshot_name=None)

Bases: nova.virt.libvirt.imagebackend.Image

create_image(prepare_template, base, size, *args, **kwargs)

snapshot_create()

snapshot_delete()

snapshot_extract(target, out_format)

class Raw(instance=None, disk_name=None, path=None, snapshot_name=None)

Bases: nova.virt.libvirt.imagebackend.Image

correct_format()

create_image(prepare_template, base, size, *args, **kwargs)

snapshot_create()

snapshot_delete()

snapshot_extract(target, out_format)