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vm_utils.py
1771 lines (1515 loc) · 67.8 KB
/
vm_utils.py
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2010 Citrix Systems, Inc.
# Copyright 2011 Piston Cloud Computing, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Helper methods for operations related to the management of VM records and
their attributes like VDIs, VIFs, as well as their lookup functions.
"""
import contextlib
import json
import os
import pickle
import re
import tempfile
import time
import urllib
import urlparse
import uuid
from decimal import Decimal, InvalidOperation
from xml.dom import minidom
from eventlet import greenthread
from nova import exception
from nova import flags
from nova.image import glance
from nova import log as logging
from nova.openstack.common import cfg
from nova import utils
from nova.compute import instance_types
from nova.compute import power_state
from nova.virt.disk import api as disk
from nova.virt.xenapi import HelperBase
from nova.virt.xenapi import volume_utils
LOG = logging.getLogger(__name__)
xenapi_vm_utils_opts = [
cfg.StrOpt('default_os_type',
default='linux',
help='Default OS type'),
cfg.IntOpt('block_device_creation_timeout',
default=10,
help='time to wait for a block device to be created'),
cfg.IntOpt('max_kernel_ramdisk_size',
default=16 * 1024 * 1024,
help='maximum size in bytes of kernel or ramdisk images'),
cfg.StrOpt('sr_matching_filter',
default='other-config:i18n-key=local-storage',
help='Filter for finding the SR to be used to install guest '
'instances on. The default value is the Local Storage in '
'default XenServer/XCP installations. To select an SR '
'with a different matching criteria, you could set it to '
'other-config:my_favorite_sr=true. On the other hand, to '
'fall back on the Default SR, as displayed by XenCenter, '
'set this flag to: default-sr:true'),
]
FLAGS = flags.FLAGS
FLAGS.register_opts(xenapi_vm_utils_opts)
XENAPI_POWER_STATE = {
'Halted': power_state.SHUTDOWN,
'Running': power_state.RUNNING,
'Paused': power_state.PAUSED,
'Suspended': power_state.SUSPENDED,
'Crashed': power_state.CRASHED}
SECTOR_SIZE = 512
MBR_SIZE_SECTORS = 63
MBR_SIZE_BYTES = MBR_SIZE_SECTORS * SECTOR_SIZE
KERNEL_DIR = '/boot/guest'
class ImageType:
"""
Enumeration class for distinguishing different image types
0 - kernel image (goes on dom0's filesystem)
1 - ramdisk image (goes on dom0's filesystem)
2 - disk image (local SR, partitioned by objectstore plugin)
3 - raw disk image (local SR, NOT partitioned by plugin)
4 - vhd disk image (local SR, NOT inspected by XS, PV assumed for
linux, HVM assumed for Windows)
5 - ISO disk image (local SR, NOT partitioned by plugin)
"""
KERNEL = 0
RAMDISK = 1
DISK = 2
DISK_RAW = 3
DISK_VHD = 4
DISK_ISO = 5
_ids = (KERNEL, RAMDISK, DISK, DISK_RAW, DISK_VHD, DISK_ISO)
KERNEL_STR = "kernel"
RAMDISK_STR = "ramdisk"
DISK_STR = "os"
DISK_RAW_STR = "os_raw"
DISK_VHD_STR = "vhd"
DISK_ISO_STR = "iso"
_strs = (KERNEL_STR, RAMDISK_STR, DISK_STR, DISK_RAW_STR, DISK_VHD_STR,
DISK_ISO_STR)
@classmethod
def to_string(cls, image_type):
return dict(zip(ImageType._ids, ImageType._strs)).get(image_type)
@classmethod
def from_string(cls, image_type_str):
return dict(zip(ImageType._strs, ImageType._ids)).get(image_type_str)
class VMHelper(HelperBase):
"""
The class that wraps the helper methods together.
"""
@classmethod
def create_vm(cls, session, instance, kernel, ramdisk,
use_pv_kernel=False):
"""Create a VM record. Returns a Deferred that gives the new
VM reference.
the use_pv_kernel flag indicates whether the guest is HVM or PV
There are 3 scenarios:
1. Using paravirtualization, kernel passed in
2. Using paravirtualization, kernel within the image
3. Using hardware virtualization
"""
inst_type_id = instance.instance_type_id
instance_type = instance_types.get_instance_type(inst_type_id)
mem = str(long(instance_type['memory_mb']) * 1024 * 1024)
vcpus = str(instance_type['vcpus'])
rec = {
'actions_after_crash': 'destroy',
'actions_after_reboot': 'restart',
'actions_after_shutdown': 'destroy',
'affinity': '',
'blocked_operations': {},
'ha_always_run': False,
'ha_restart_priority': '',
'HVM_boot_params': {},
'HVM_boot_policy': '',
'is_a_template': False,
'memory_dynamic_min': mem,
'memory_dynamic_max': mem,
'memory_static_min': '0',
'memory_static_max': mem,
'memory_target': mem,
'name_description': '',
'name_label': instance.name,
'other_config': {'allowvssprovider': False},
'other_config': {},
'PCI_bus': '',
'platform': {'acpi': 'true', 'apic': 'true', 'pae': 'true',
'viridian': 'true', 'timeoffset': '0'},
'PV_args': '',
'PV_bootloader': '',
'PV_bootloader_args': '',
'PV_kernel': '',
'PV_legacy_args': '',
'PV_ramdisk': '',
'recommendations': '',
'tags': [],
'user_version': '0',
'VCPUs_at_startup': vcpus,
'VCPUs_max': vcpus,
'VCPUs_params': {},
'xenstore_data': {}}
# Complete VM configuration record according to the image type
# non-raw/raw with PV kernel/raw in HVM mode
if use_pv_kernel:
rec['platform']['nx'] = 'false'
if instance.kernel_id:
# 1. Kernel explicitly passed in, use that
rec['PV_args'] = 'root=/dev/xvda1'
rec['PV_kernel'] = kernel
rec['PV_ramdisk'] = ramdisk
else:
# 2. Use kernel within the image
rec['PV_bootloader'] = 'pygrub'
else:
# 3. Using hardware virtualization
rec['platform']['nx'] = 'true'
rec['HVM_boot_params'] = {'order': 'dc'}
rec['HVM_boot_policy'] = 'BIOS order'
LOG.debug(_('Created VM %s...'), instance.name)
vm_ref = session.call_xenapi('VM.create', rec)
instance_name = instance.name
LOG.debug(_('Created VM %(instance_name)s as %(vm_ref)s.') % locals())
return vm_ref
@classmethod
def ensure_free_mem(cls, session, instance):
inst_type_id = instance.instance_type_id
instance_type = instance_types.get_instance_type(inst_type_id)
mem = long(instance_type['memory_mb']) * 1024 * 1024
#get free memory from host
host = session.get_xenapi_host()
host_free_mem = long(session.call_xenapi("host.compute_free_memory",
host))
return host_free_mem >= mem
@classmethod
def create_cd_vbd(cls, session, vm_ref, vdi_ref, userdevice, bootable):
"""Create a VBD record. Returns a Deferred that gives the new
VBD reference specific to CDRom devices."""
vbd_rec = {}
vbd_rec['VM'] = vm_ref
vbd_rec['VDI'] = vdi_ref
vbd_rec['userdevice'] = str(userdevice)
vbd_rec['bootable'] = bootable
vbd_rec['mode'] = 'RO'
vbd_rec['type'] = 'CD'
vbd_rec['unpluggable'] = True
vbd_rec['empty'] = False
vbd_rec['other_config'] = {}
vbd_rec['qos_algorithm_type'] = ''
vbd_rec['qos_algorithm_params'] = {}
vbd_rec['qos_supported_algorithms'] = []
LOG.debug(_('Creating a CDROM-specific VBD for VM %(vm_ref)s,'
' VDI %(vdi_ref)s ... ') % locals())
vbd_ref = session.call_xenapi('VBD.create', vbd_rec)
LOG.debug(_('Created a CDROM-specific VBD %(vbd_ref)s '
' for VM %(vm_ref)s, VDI %(vdi_ref)s.') % locals())
return vbd_ref
@classmethod
def find_vbd_by_number(cls, session, vm_ref, number):
"""Get the VBD reference from the device number"""
vbd_refs = session.call_xenapi("VM.get_VBDs", vm_ref)
if vbd_refs:
for vbd_ref in vbd_refs:
try:
vbd_rec = session.call_xenapi("VBD.get_record", vbd_ref)
if vbd_rec['userdevice'] == str(number):
return vbd_ref
except cls.XenAPI.Failure, exc:
LOG.exception(exc)
raise volume_utils.StorageError(
_('VBD not found in instance %s') % vm_ref)
@classmethod
def unplug_vbd(cls, session, vbd_ref):
"""Unplug VBD from VM"""
try:
vbd_ref = session.call_xenapi('VBD.unplug', vbd_ref)
except cls.XenAPI.Failure, exc:
LOG.exception(exc)
if exc.details[0] != 'DEVICE_ALREADY_DETACHED':
raise volume_utils.StorageError(
_('Unable to unplug VBD %s') % vbd_ref)
@classmethod
def destroy_vbd(cls, session, vbd_ref):
"""Destroy VBD from host database"""
try:
task = session.call_xenapi('Async.VBD.destroy', vbd_ref)
session.wait_for_task(task)
except cls.XenAPI.Failure, exc:
LOG.exception(exc)
raise volume_utils.StorageError(
_('Unable to destroy VBD %s') % vbd_ref)
@classmethod
def destroy_vdi(cls, session, vdi_ref):
try:
task = session.call_xenapi('Async.VDI.destroy', vdi_ref)
session.wait_for_task(task)
except cls.XenAPI.Failure, exc:
LOG.exception(exc)
raise volume_utils.StorageError(
_('Unable to destroy VDI %s') % vdi_ref)
@classmethod
def create_vdi(cls, session, sr_ref, name_label, virtual_size, read_only):
"""Create a VDI record and returns its reference."""
vdi_ref = session.call_xenapi("VDI.create",
{'name_label': name_label,
'name_description': '',
'SR': sr_ref,
'virtual_size': str(virtual_size),
'type': 'User',
'sharable': False,
'read_only': read_only,
'xenstore_data': {},
'other_config': {},
'sm_config': {},
'tags': []})
LOG.debug(_('Created VDI %(vdi_ref)s (%(name_label)s,'
' %(virtual_size)s, %(read_only)s) on %(sr_ref)s.')
% locals())
return vdi_ref
@classmethod
def copy_vdi(cls, session, sr_ref, vdi_to_copy_ref):
"""Copy a VDI and return the new VDIs reference."""
vdi_ref = session.call_xenapi('VDI.copy', vdi_to_copy_ref, sr_ref)
LOG.debug(_('Copied VDI %(vdi_ref)s from VDI '
'%(vdi_to_copy_ref)s on %(sr_ref)s.') % locals())
return vdi_ref
@classmethod
def clone_vdi(cls, session, vdi_to_clone_ref):
"""Clones a VDI and return the new VDIs reference."""
vdi_ref = session.call_xenapi('VDI.clone', vdi_to_clone_ref)
LOG.debug(_('Cloned VDI %(vdi_ref)s from VDI '
'%(vdi_to_clone_ref)s') % locals())
return vdi_ref
@classmethod
def set_vdi_name_label(cls, session, vdi_uuid, name_label):
vdi_ref = session.call_xenapi("VDI.get_by_uuid", vdi_uuid)
session.call_xenapi("VDI.set_name_label", vdi_ref, name_label)
@classmethod
def get_vdi_for_vm_safely(cls, session, vm_ref):
"""Retrieves the primary VDI for a VM"""
vbd_refs = session.call_xenapi("VM.get_VBDs", vm_ref)
for vbd in vbd_refs:
vbd_rec = session.call_xenapi("VBD.get_record", vbd)
# Convention dictates the primary VDI will be userdevice 0
if vbd_rec['userdevice'] == '0':
vdi_rec = session.call_xenapi("VDI.get_record", vbd_rec['VDI'])
return vbd_rec['VDI'], vdi_rec
raise exception.Error(_("No primary VDI found for"
"%(vm_ref)s") % locals())
@classmethod
def create_snapshot(cls, session, instance, vm_ref, label):
"""Creates Snapshot (Template) VM, Snapshot VBD, Snapshot VDI,
Snapshot VHD"""
LOG.debug(_("Snapshotting VM %(vm_ref)s with label '%(label)s'...")
% locals())
vm_vdi_ref, vm_vdi_rec = cls.get_vdi_for_vm_safely(session, vm_ref)
sr_ref = vm_vdi_rec["SR"]
original_parent_uuid = get_vhd_parent_uuid(session, vm_vdi_ref)
task = session.call_xenapi('Async.VM.snapshot', vm_ref, label)
template_vm_ref = session.wait_for_task(task, instance['uuid'])
template_vdi_rec = cls.get_vdi_for_vm_safely(session,
template_vm_ref)[1]
template_vdi_uuid = template_vdi_rec["uuid"]
LOG.debug(_('Created snapshot %(template_vm_ref)s from'
' VM %(vm_ref)s.') % locals())
parent_uuid, base_uuid = _wait_for_vhd_coalesce(
session, instance, sr_ref, vm_vdi_ref, original_parent_uuid)
template_vdi_uuids = {'base': base_uuid,
'image': parent_uuid,
'snap': template_vdi_uuid}
return template_vm_ref, template_vdi_uuids
@classmethod
def get_sr_path(cls, session):
"""Return the path to our storage repository
This is used when we're dealing with VHDs directly, either by taking
snapshots or by restoring an image in the DISK_VHD format.
"""
sr_ref = cls.safe_find_sr(session)
sr_rec = session.call_xenapi("SR.get_record", sr_ref)
sr_uuid = sr_rec["uuid"]
return os.path.join(FLAGS.xenapi_sr_base_path, sr_uuid)
@classmethod
def find_cached_image(cls, session, image_id, sr_ref):
"""Returns the vdi-ref of the cached image."""
for vdi_ref, vdi_rec in _get_all_vdis_in_sr(session, sr_ref):
if ('image-id' in vdi_rec['other_config'] and
vdi_rec['other_config']['image-id'] == image_id):
return vdi_ref
return None
@classmethod
def upload_image(cls, context, session, instance, vdi_uuids, image_id):
""" Requests that the Glance plugin bundle the specified VDIs and
push them into Glance using the specified human-friendly name.
"""
# NOTE(sirp): Currently we only support uploading images as VHD, there
# is no RAW equivalent (yet)
LOG.debug(_("Asking xapi to upload %(vdi_uuids)s as"
" ID %(image_id)s") % locals())
glance_host, glance_port = glance.pick_glance_api_server()
properties = {}
properties['auto_disk_config'] = instance.auto_disk_config
properties['os_type'] = instance.os_type or FLAGS.default_os_type
params = {'vdi_uuids': vdi_uuids,
'image_id': image_id,
'glance_host': glance_host,
'glance_port': glance_port,
'sr_path': cls.get_sr_path(session),
'auth_token': getattr(context, 'auth_token', None),
'properties': properties}
kwargs = {'params': pickle.dumps(params)}
task = session.async_call_plugin('glance', 'upload_vhd', kwargs)
session.wait_for_task(task, instance['uuid'])
@classmethod
def resize_disk(cls, session, vdi_ref, instance_type):
# Copy VDI over to something we can resize
# NOTE(jerdfelt): Would be nice to just set vdi_ref to read/write
sr_ref = cls.safe_find_sr(session)
copy_ref = session.call_xenapi('VDI.copy', vdi_ref, sr_ref)
copy_uuid = session.call_xenapi('VDI.get_uuid', copy_ref)
try:
# Resize partition and filesystem down
cls.auto_configure_disk(session=session,
vdi_ref=copy_ref,
new_gb=instance_type['root_gb'])
# Create new VDI
new_ref = cls.fetch_blank_disk(session,
instance_type['id'])
new_uuid = session.call_xenapi('VDI.get_uuid', new_ref)
# Manually copy contents over
virtual_size = instance_type['root_gb'] * 1024 * 1024 * 1024
_copy_partition(session, copy_ref, new_ref, 1, virtual_size)
return new_ref, new_uuid
finally:
cls.destroy_vdi(session, copy_ref)
@classmethod
def auto_configure_disk(cls, session, vdi_ref, new_gb):
"""Partition and resize FS to match the size specified by
instance_types.root_gb.
This is a fail-safe to prevent accidentally destroying data on a disk
erroneously marked as auto_disk_config=True.
The criteria for allowing resize are:
1. 'auto_disk_config' must be true for the instance (and image).
(If we've made it here, then auto_disk_config=True.)
2. The disk must have only one partition.
3. The file-system on the one partition must be ext3 or ext4.
"""
with vdi_attached_here(session, vdi_ref, read_only=False) as dev:
partitions = _get_partitions(dev)
if len(partitions) != 1:
return
num, start, old_sectors, ptype = partitions[0]
if ptype in ('ext3', 'ext4'):
new_sectors = new_gb * 1024 * 1024 * 1024 / SECTOR_SIZE
_resize_part_and_fs(dev, start, old_sectors, new_sectors)
@classmethod
def _generate_disk(cls, session, instance, vm_ref, userdevice, name,
size_mb, fs_type):
"""
Steps to programmatically generate a disk:
1. Create VDI of desired size
2. Attach VDI to compute worker
3. Create partition
4. Create VBD between instance VM and VDI
"""
# 1. Create VDI
sr_ref = cls.safe_find_sr(session)
name_label = '%s-%s' % (instance.name, name)
ONE_MEG = 1024 * 1024
virtual_size = size_mb * ONE_MEG
vdi_ref = cls.create_vdi(
session, sr_ref, name_label, virtual_size, read_only=False)
try:
# 2. Attach VDI to compute worker (VBD hotplug)
with vdi_attached_here(session, vdi_ref, read_only=False) as dev:
# 3. Create partition
dev_path = utils.make_dev_path(dev)
utils.execute('parted', '--script', dev_path,
'mklabel', 'msdos', run_as_root=True)
partition_start = 0
partition_end = size_mb
utils.execute('parted', '--script', dev_path,
'mkpart', 'primary',
str(partition_start),
str(partition_end),
run_as_root=True)
partition_path = utils.make_dev_path(dev, partition=1)
if fs_type == 'linux-swap':
utils.execute('mkswap', partition_path,
run_as_root=True)
elif fs_type is not None:
utils.execute('mkfs', '-t', fs_type, partition_path,
run_as_root=True)
# 4. Create VBD between instance VM and swap VDI
volume_utils.VolumeHelper.create_vbd(
session, vm_ref, vdi_ref, userdevice, bootable=False)
except Exception:
with utils.save_and_reraise_exception():
cls.destroy_vdi(session, vdi_ref)
@classmethod
def generate_swap(cls, session, instance, vm_ref, userdevice, swap_mb):
# NOTE(jk0): We use a FAT32 filesystem for the Windows swap
# partition because that is what parted supports.
is_windows = instance.os_type == "windows"
fs_type = "vfat" if is_windows else "linux-swap"
cls._generate_disk(session, instance, vm_ref, userdevice,
'swap', swap_mb, fs_type)
@classmethod
def generate_ephemeral(cls, session, instance, vm_ref, userdevice,
size_gb):
cls._generate_disk(session, instance, vm_ref, userdevice,
'ephemeral', size_gb * 1024,
FLAGS.default_ephemeral_format)
@classmethod
def fetch_blank_disk(cls, session, instance_type_id):
# Size the blank harddrive to suit the machine type:
one_gig = 1024 * 1024 * 1024
req_type = instance_types.get_instance_type(instance_type_id)
req_size = req_type['root_gb']
LOG.debug("Creating blank HD of size %(req_size)d gigs"
% locals())
vdi_size = one_gig * req_size
LOG.debug("ISO vm create: Looking for the SR")
sr_ref = cls.safe_find_sr(session)
vdi_ref = cls.create_vdi(session, sr_ref, 'blank HD', vdi_size, False)
return vdi_ref
@classmethod
def create_kernel_image(cls, context, session, instance, image, user_id,
project_id, image_type):
"""Creates kernel/ramdisk file from the image stored in the cache.
If the image is not present in the cache, it streams it from glance.
Returns: A list of dictionaries that describe VDIs
"""
filename = ""
if FLAGS.cache_images:
args = {}
args['cached-image'] = image
args['new-image-uuid'] = str(uuid.uuid4())
task = session.async_call_plugin('glance', "create_kernel_ramdisk",
args)
filename = session.wait_for_task(task, instance.id)
if filename == "":
return cls.fetch_image(context, session, instance, image,
user_id, project_id, image_type)
else:
return [dict(vdi_type=ImageType.to_string(image_type),
vdi_uuid=None,
file=filename)]
@classmethod
def create_image(cls, context, session, instance, image, user_id,
project_id, image_type):
"""Creates VDI from the image stored in the local cache. If the image
is not present in the cache, it streams it from glance.
Returns: A list of dictionaries that describe VDIs
"""
if FLAGS.cache_images == False or image_type == ImageType.DISK_ISO:
# If caching is disabled, we do not have to keep a copy of the
# image. Fetch the image from glance.
return cls.fetch_image(context, session,
instance, instance.image_ref,
instance.user_id, instance.project_id,
image_type)
sr_ref = cls.safe_find_sr(session)
sr_type = session.call_xenapi('SR.get_record', sr_ref)["type"]
vdi_return_list = []
if FLAGS.use_cow_images and sr_type != "ext":
LOG.warning(_("Fast cloning is only supported on default local SR "
"of type ext. SR on this system was found to be of "
"type %(sr_type)s. Ignoring the cow flag.")
% locals())
vdi_ref = cls.find_cached_image(session, image, sr_ref)
if vdi_ref is None:
vdis = cls.fetch_image(context, session, instance, image, user_id,
project_id, image_type)
vdi_ref = session.call_xenapi('VDI.get_by_uuid',
vdis[0]['vdi_uuid'])
session.call_xenapi('VDI.add_to_other_config',
vdi_ref, "image-id", str(image))
session.call_xenapi('VDI.set_name_label',
vdi_ref, "Cached glance image")
for vdi in vdis:
if vdi["vdi_type"] == "swap":
session.call_xenapi('VDI.add_to_other_config',
vdi_ref, "swap-disk",
str(vdi['vdi_uuid']))
if FLAGS.use_cow_images and sr_type == 'ext':
new_vdi_ref = cls.clone_vdi(session, vdi_ref)
else:
new_vdi_ref = cls.copy_vdi(session, sr_ref, vdi_ref)
# Set the name label for the image we just created and remove image id
# field from other-config.
session.call_xenapi('VDI.set_name_label', new_vdi_ref, instance.name)
session.call_xenapi('VDI.remove_from_other_config',
new_vdi_ref, "image-id")
vdi_return_list.append(dict(
vdi_type=("os" if image_type == ImageType.DISK_VHD
else ImageType.to_string(image_type)),
vdi_uuid=session.call_xenapi('VDI.get_uuid', new_vdi_ref),
file=None))
# Create a swap disk if the glance image had one associated with it.
vdi_rec = session.call_xenapi('VDI.get_record', vdi_ref)
if 'swap-disk' in vdi_rec['other_config']:
swap_disk_uuid = vdi_rec['other_config']['swap-disk']
swap_vdi_ref = session.call_xenapi('VDI.get_by_uuid',
swap_disk_uuid)
new_swap_vdi_ref = cls.copy_vdi(session, sr_ref, swap_vdi_ref)
new_swap_vdi_uuid = session.call_xenapi('VDI.get_uuid',
new_swap_vdi_ref)
session.call_xenapi('VDI.set_name_label', new_swap_vdi_ref,
instance.name + "-swap")
vdi_return_list.append(dict(vdi_type="swap",
vdi_uuid=new_swap_vdi_uuid,
file=None))
return vdi_return_list
@classmethod
def fetch_image(cls, context, session, instance, image, user_id,
project_id, image_type):
"""Fetch image from glance based on image type.
Returns: A single filename if image_type is KERNEL or RAMDISK
A list of dictionaries that describe VDIs, otherwise
"""
if image_type == ImageType.DISK_VHD:
return cls._fetch_image_glance_vhd(context,
session, instance, image, image_type)
else:
return cls._fetch_image_glance_disk(context,
session, instance, image, image_type)
@classmethod
def _fetch_image_glance_vhd(cls, context, session, instance, image,
image_type):
"""Tell glance to download an image and put the VHDs into the SR
Returns: A list of dictionaries that describe VDIs
"""
instance_id = instance.id
LOG.debug(_("Asking xapi to fetch vhd image %(image)s")
% locals())
sr_ref = cls.safe_find_sr(session)
# NOTE(sirp): The Glance plugin runs under Python 2.4
# which does not have the `uuid` module. To work around this,
# we generate the uuids here (under Python 2.6+) and
# pass them as arguments
uuid_stack = [str(uuid.uuid4()) for i in xrange(3)]
glance_host, glance_port = glance.pick_glance_api_server()
params = {'image_id': image,
'glance_host': glance_host,
'glance_port': glance_port,
'uuid_stack': uuid_stack,
'sr_path': cls.get_sr_path(session),
'num_retries': FLAGS.glance_num_retries,
'auth_token': getattr(context, 'auth_token', None)}
kwargs = {'params': pickle.dumps(params)}
task = session.async_call_plugin('glance', 'download_vhd', kwargs)
result = session.wait_for_task(task, instance['uuid'])
# 'download_vhd' will return a json encoded string containing
# a list of dictionaries describing VDIs. The dictionary will
# contain 'vdi_type' and 'vdi_uuid' keys. 'vdi_type' can be
# 'os' or 'swap' right now.
vdis = json.loads(result)
for vdi in vdis:
LOG.debug(_("xapi 'download_vhd' returned VDI of "
"type '%(vdi_type)s' with UUID '%(vdi_uuid)s'" % vdi))
cls.scan_sr(session, instance, sr_ref)
# Pull out the UUID of the first VDI (which is the os VDI)
os_vdi_uuid = vdis[0]['vdi_uuid']
# Set the name-label to ease debugging
vdi_ref = session.call_xenapi("VDI.get_by_uuid", os_vdi_uuid)
primary_name_label = instance.name
session.call_xenapi("VDI.set_name_label", vdi_ref, primary_name_label)
cls._check_vdi_size(context, session, instance, os_vdi_uuid)
return vdis
@classmethod
def _get_vdi_chain_size(cls, context, session, vdi_uuid):
"""Compute the total size of a VDI chain, starting with the specified
VDI UUID.
This will walk the VDI chain to the root, add the size of each VDI into
the total.
"""
size_bytes = 0
for vdi_rec in walk_vdi_chain(session, vdi_uuid):
cur_vdi_uuid = vdi_rec['uuid']
vdi_size_bytes = int(vdi_rec['physical_utilisation'])
LOG.debug(_('vdi_uuid=%(cur_vdi_uuid)s vdi_size_bytes='
'%(vdi_size_bytes)d' % locals()))
size_bytes += vdi_size_bytes
return size_bytes
@classmethod
def _check_vdi_size(cls, context, session, instance, vdi_uuid):
size_bytes = cls._get_vdi_chain_size(context, session, vdi_uuid)
# FIXME(jk0): this was copied directly from compute.manager.py, let's
# refactor this to a common area
instance_type_id = instance['instance_type_id']
instance_type = instance_types.get_instance_type(instance_type_id)
allowed_size_gb = instance_type['root_gb']
allowed_size_bytes = allowed_size_gb * 1024 * 1024 * 1024
LOG.debug(_("image_size_bytes=%(size_bytes)d, allowed_size_bytes="
"%(allowed_size_bytes)d") % locals())
if size_bytes > allowed_size_bytes:
LOG.info(_("Image size %(size_bytes)d exceeded"
" instance_type allowed size "
"%(allowed_size_bytes)d")
% locals())
raise exception.ImageTooLarge()
@classmethod
def _fetch_image_glance_disk(cls, context, session, instance, image,
image_type):
"""Fetch the image from Glance
NOTE:
Unlike _fetch_image_glance_vhd, this method does not use the Glance
plugin; instead, it streams the disks through domU to the VDI
directly.
Returns: A single filename if image_type is KERNEL_RAMDISK
A list of dictionaries that describe VDIs, otherwise
"""
instance_id = instance.id
# FIXME(sirp): Since the Glance plugin seems to be required for the
# VHD disk, it may be worth using the plugin for both VHD and RAW and
# DISK restores
LOG.debug(_("Fetching image %(image)s") % locals())
LOG.debug(_("Image Type: %s"), ImageType.to_string(image_type))
if image_type == ImageType.DISK_ISO:
sr_ref = cls.safe_find_iso_sr(session)
LOG.debug(_("ISO: Found sr possibly containing the ISO image"))
else:
sr_ref = cls.safe_find_sr(session)
glance_client, image_id = glance.get_glance_client(context, image)
glance_client.set_auth_token(getattr(context, 'auth_token', None))
meta, image_file = glance_client.get_image(image_id)
virtual_size = int(meta['size'])
vdi_size = virtual_size
LOG.debug(_("Size for image %(image)s:" +
"%(virtual_size)d") % locals())
if image_type == ImageType.DISK:
# Make room for MBR.
vdi_size += MBR_SIZE_BYTES
elif (image_type in (ImageType.KERNEL, ImageType.RAMDISK) and
vdi_size > FLAGS.max_kernel_ramdisk_size):
max_size = FLAGS.max_kernel_ramdisk_size
raise exception.Error(
_("Kernel/Ramdisk image is too large: %(vdi_size)d bytes, "
"max %(max_size)d bytes") % locals())
name_label = instance.name
vdi_ref = cls.create_vdi(session, sr_ref, name_label, vdi_size, False)
# From this point we have a VDI on Xen host;
# If anything goes wrong, we need to remember its uuid.
try:
filename = None
vdi_uuid = session.call_xenapi("VDI.get_uuid", vdi_ref)
with vdi_attached_here(session, vdi_ref, read_only=False) as dev:
_stream_disk(dev, image_type, virtual_size, image_file)
if image_type in (ImageType.KERNEL, ImageType.RAMDISK):
# We need to invoke a plugin for copying the
# content of the VDI into the proper path.
LOG.debug(_("Copying VDI %s to /boot/guest on dom0"), vdi_ref)
fn = "copy_kernel_vdi"
args = {}
args['vdi-ref'] = vdi_ref
# Let the plugin copy the correct number of bytes.
args['image-size'] = str(vdi_size)
if FLAGS.cache_images:
args['cached-image'] = image
task = session.async_call_plugin('glance', fn, args)
filename = session.wait_for_task(task, instance['uuid'])
# Remove the VDI as it is not needed anymore.
session.call_xenapi("VDI.destroy", vdi_ref)
LOG.debug(_("Kernel/Ramdisk VDI %s destroyed"), vdi_ref)
return [dict(vdi_type=ImageType.to_string(image_type),
vdi_uuid=None,
file=filename)]
else:
return [dict(vdi_type=ImageType.to_string(image_type),
vdi_uuid=vdi_uuid,
file=None)]
except (cls.XenAPI.Failure, IOError, OSError) as e:
# We look for XenAPI and OS failures.
LOG.exception(_("instance %s: Failed to fetch glance image"),
instance_id)
e.args = e.args + ([dict(vdi_type=ImageType.
to_string(image_type),
vdi_uuid=vdi_uuid,
file=filename)],)
raise e
@classmethod
def determine_disk_image_type(cls, image_meta):
"""Disk Image Types are used to determine where the kernel will reside
within an image. To figure out which type we're dealing with, we use
the following rules:
1. If we're using Glance, we can use the image_type field to
determine the image_type
2. If we're not using Glance, then we need to deduce this based on
whether a kernel_id is specified.
"""
disk_format = image_meta['disk_format']
disk_format_map = {
'ami': 'DISK',
'aki': 'KERNEL',
'ari': 'RAMDISK',
'raw': 'DISK_RAW',
'vhd': 'DISK_VHD',
'iso': 'DISK_ISO',
}
try:
image_type_str = disk_format_map[disk_format]
except KeyError:
raise exception.InvalidDiskFormat(disk_format=disk_format)
image_type = getattr(ImageType, image_type_str)
image_ref = image_meta['id']
msg = _("Detected %(image_type_str)s format for image %(image_ref)s")
LOG.debug(msg % locals())
return image_type
@classmethod
def determine_is_pv(cls, session, instance_id, vdi_ref, disk_image_type,
os_type):
"""
Determine whether the VM will use a paravirtualized kernel or if it
will use hardware virtualization.
1. Glance (VHD): then we use `os_type`, raise if not set
2. Glance (DISK_RAW): use Pygrub to figure out if pv kernel is
available
3. Glance (DISK): pv is assumed
4. Glance (DISK_ISO): no pv is assumed
"""
LOG.debug(_("Looking up vdi %s for PV kernel"), vdi_ref)
if disk_image_type == ImageType.DISK_VHD:
# 1. VHD
if os_type == 'windows':
is_pv = False
else:
is_pv = True
elif disk_image_type == ImageType.DISK_RAW:
# 2. RAW
with vdi_attached_here(session, vdi_ref, read_only=True) as dev:
is_pv = _is_vdi_pv(dev)
elif disk_image_type == ImageType.DISK:
# 3. Disk
is_pv = True
elif disk_image_type == ImageType.DISK_ISO:
# 4. ISO
is_pv = False
else:
raise exception.Error(_("Unknown image format %(disk_image_type)s")
% locals())
return is_pv
@classmethod
def set_vm_name_label(cls, session, vm_ref, name_label):
session.call_xenapi("VM.set_name_label", vm_ref, name_label)
@classmethod
def list_vms(cls, session):
for vm_ref, vm_rec in cls.get_all_refs_and_recs(session, 'VM'):
if vm_rec["is_a_template"] or vm_rec["is_control_domain"]:
continue
else:
yield vm_ref, vm_rec
@classmethod
def lookup(cls, session, name_label):
"""Look the instance up and return it if available"""
vm_refs = session.call_xenapi("VM.get_by_name_label", name_label)
n = len(vm_refs)
if n == 0:
return None
elif n > 1:
raise exception.InstanceExists(name=name_label)
else:
return vm_refs[0]
@classmethod
def lookup_vm_vdis(cls, session, vm_ref):
"""Look for the VDIs that are attached to the VM"""
# Firstly we get the VBDs, then the VDIs.
# TODO(Armando): do we leave the read-only devices?
vbd_refs = session.call_xenapi("VM.get_VBDs", vm_ref)
vdi_refs = []
if vbd_refs:
for vbd_ref in vbd_refs:
try:
vdi_ref = session.call_xenapi("VBD.get_VDI", vbd_ref)
# Test valid VDI
record = session.call_xenapi("VDI.get_record", vdi_ref)
LOG.debug(_('VDI %s is still available'), record['uuid'])
except cls.XenAPI.Failure, exc:
LOG.exception(exc)
else:
vdi_refs.append(vdi_ref)
if len(vdi_refs) > 0:
return vdi_refs
else:
return None
@classmethod
def preconfigure_instance(cls, session, instance, vdi_ref, network_info):
"""Makes alterations to the image before launching as part of spawn.
"""
# As mounting the image VDI is expensive, we only want do do it once,
# if at all, so determine whether it's required first, and then do
# everything
mount_required = False
key, net, metadata = _prepare_injectables(instance, network_info)
mount_required = key or net or metadata
if not mount_required: