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nova/nova/virt/xenapi/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.
# Copyright 2012 OpenStack, LLC.
#
# 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 decimal
import os
import re
import time
import urllib
import urlparse
import uuid
from xml.dom import minidom
from xml.parsers import expat
from eventlet import greenthread
from nova import block_device
from nova.compute import power_state
from nova.compute import task_states
from nova import exception
from nova.image import glance
from nova.openstack.common import cfg
from nova.openstack.common import excutils
from nova.openstack.common import log as logging
from nova import utils
from nova.virt.disk import api as disk
from nova.virt.disk.vfs import localfs as vfsimpl
from nova.virt import driver
from nova.virt.xenapi import agent
from nova.virt.xenapi import volume_utils
LOG = logging.getLogger(__name__)
xenapi_vm_utils_opts = [
cfg.StrOpt('cache_images',
default='all',
help='Cache glance images locally. `all` will cache all'
' images, `some` will only cache images that have the'
' image_property `cache_in_nova=True`, and `none` turns'
' off caching entirely'),
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'),
cfg.BoolOpt('xenapi_sparse_copy',
default=True,
help='Whether to use sparse_copy for copying data on a '
'resize down (False will use standard dd). This speeds '
'up resizes down considerably since large runs of zeros '
'won\'t have to be rsynced'),
cfg.IntOpt('xenapi_num_vbd_unplug_retries',
default=10,
help='Maximum number of retries to unplug VBD'),
cfg.StrOpt('xenapi_torrent_images',
default='none',
help='Whether or not to download images via Bit Torrent '
'(all|some|none).'),
cfg.StrOpt('xenapi_torrent_base_url',
default=None,
help='Base URL for torrent files.'),
cfg.FloatOpt('xenapi_torrent_seed_chance',
default=1.0,
help='Probability that peer will become a seeder.'
' (1.0 = 100%)'),
cfg.IntOpt('xenapi_torrent_seed_duration',
default=3600,
help='Number of seconds after downloading an image via'
' BitTorrent that it should be seeded for other peers.'),
cfg.IntOpt('xenapi_torrent_max_last_accessed',
default=86400,
help='Cached torrent files not accessed within this number of'
' seconds can be reaped'),
cfg.IntOpt('xenapi_torrent_listen_port_start',
default=6881,
help='Beginning of port range to listen on'),
cfg.IntOpt('xenapi_torrent_listen_port_end',
default=6891,
help='End of port range to listen on'),
cfg.IntOpt('xenapi_torrent_download_stall_cutoff',
default=600,
help='Number of seconds a download can remain at the same'
' progress percentage w/o being considered a stall'),
cfg.IntOpt('xenapi_torrent_max_seeder_processes_per_host',
default=1,
help='Maximum number of seeder processes to run concurrently'
' within a given dom0. (-1 = no limit)')
]
CONF = cfg.CONF
CONF.register_opts(xenapi_vm_utils_opts)
CONF.import_opt('default_ephemeral_format', 'nova.config')
CONF.import_opt('glance_num_retries', 'nova.image.glance')
CONF.import_opt('use_cow_images', 'nova.config')
CONF.import_opt('use_ipv6', 'nova.config')
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'
MAX_VDI_CHAIN_SIZE = 16
class ImageType(object):
"""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 = "root"
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 get_role(cls, image_type_id):
" Get the role played by the image, based on its type "
return {
cls.KERNEL: 'kernel',
cls.RAMDISK: 'ramdisk',
cls.DISK: 'root',
cls.DISK_RAW: 'root',
cls.DISK_VHD: 'root',
cls.DISK_ISO: 'iso'
}.get(image_type_id)
def _system_metadata_to_dict(system_metadata):
result = {}
for item in system_metadata:
result[item['key']] = item['value']
return result
def create_vm(session, instance, name_label, kernel, ramdisk,
use_pv_kernel=False):
"""Create a VM record. Returns 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
"""
instance_type = instance['instance_type']
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': name_label,
'other_config': {'allowvssprovider': str(False),
'nova_uuid': str(instance['uuid'])},
'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'
vm_ref = session.call_xenapi('VM.create', rec)
LOG.debug(_('Created VM'), instance=instance)
return vm_ref
def destroy_vm(session, instance, vm_ref):
"""Destroys a VM record."""
try:
session.call_xenapi('VM.destroy', vm_ref)
except session.XenAPI.Failure, exc:
LOG.exception(exc)
return
LOG.debug(_("VM destroyed"), instance=instance)
def clean_shutdown_vm(session, instance, vm_ref):
if _is_vm_shutdown(session, vm_ref):
LOG.warn(_("VM already halted, skipping shutdown..."),
instance=instance)
return False
LOG.debug(_("Shutting down VM (cleanly)"), instance=instance)
try:
session.call_xenapi('VM.clean_shutdown', vm_ref)
except session.XenAPI.Failure, exc:
LOG.exception(exc)
return False
return True
def hard_shutdown_vm(session, instance, vm_ref):
if _is_vm_shutdown(session, vm_ref):
LOG.warn(_("VM already halted, skipping shutdown..."),
instance=instance)
return False
LOG.debug(_("Shutting down VM (hard)"), instance=instance)
try:
session.call_xenapi('VM.hard_shutdown', vm_ref)
except session.XenAPI.Failure, exc:
LOG.exception(exc)
return False
return True
def _is_vm_shutdown(session, vm_ref):
vm_rec = session.call_xenapi("VM.get_record", vm_ref)
state = compile_info(vm_rec)['state']
if state == power_state.SHUTDOWN:
return True
return False
def ensure_free_mem(session, instance):
inst_type_id = instance['instance_type_id']
instance_type = instance['instance_type']
mem = long(instance_type['memory_mb']) * 1024 * 1024
host = session.get_xenapi_host()
host_free_mem = long(session.call_xenapi("host.compute_free_memory",
host))
return host_free_mem >= mem
def find_vbd_by_number(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 session.XenAPI.Failure, exc:
LOG.exception(exc)
raise volume_utils.StorageError(
_('VBD not found in instance %s') % vm_ref)
def unplug_vbd(session, vbd_ref):
"""Unplug VBD from VM."""
# Call VBD.unplug on the given VBD, with a retry if we get
# DEVICE_DETACH_REJECTED. For reasons which we don't understand,
# we're seeing the device still in use, even when all processes
# using the device should be dead.
max_attempts = CONF.xenapi_num_vbd_unplug_retries + 1
for num_attempt in xrange(1, max_attempts + 1):
try:
session.call_xenapi('VBD.unplug', vbd_ref)
return
except session.XenAPI.Failure, exc:
err = len(exc.details) > 0 and exc.details[0]
if err == 'DEVICE_ALREADY_DETACHED':
LOG.info(_('VBD %s already detached'), vbd_ref)
return
elif err == 'DEVICE_DETACH_REJECTED':
LOG.info(_('VBD %(vbd_ref)s detach rejected, attempt'
' %(num_attempt)d/%(max_attempts)d'), locals())
else:
LOG.exception(exc)
raise volume_utils.StorageError(
_('Unable to unplug VBD %s') % vbd_ref)
greenthread.sleep(1)
raise volume_utils.StorageError(
_('Reached maximum number of retries trying to unplug VBD %s')
% vbd_ref)
def destroy_vbd(session, vbd_ref):
"""Destroy VBD from host database."""
try:
session.call_xenapi('VBD.destroy', vbd_ref)
except session.XenAPI.Failure, exc:
LOG.exception(exc)
raise volume_utils.StorageError(
_('Unable to destroy VBD %s') % vbd_ref)
def create_vbd(session, vm_ref, vdi_ref, userdevice, vbd_type='disk',
read_only=False, bootable=False, osvol=False):
"""Create a VBD record and returns its reference."""
vbd_rec = {}
vbd_rec['VM'] = vm_ref
vbd_rec['VDI'] = vdi_ref
vbd_rec['userdevice'] = str(userdevice)
vbd_rec['bootable'] = bootable
vbd_rec['mode'] = read_only and 'RO' or 'RW'
vbd_rec['type'] = vbd_type
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 %(vbd_type)s-type VBD for VM %(vm_ref)s,'
' VDI %(vdi_ref)s ... '), locals())
vbd_ref = session.call_xenapi('VBD.create', vbd_rec)
LOG.debug(_('Created VBD %(vbd_ref)s for VM %(vm_ref)s,'
' VDI %(vdi_ref)s.'), locals())
if osvol:
# set osvol=True in other-config to indicate this is an
# attached nova (or cinder) volume
session.call_xenapi("VBD.add_to_other_config",
vbd_ref, 'osvol', "True")
return vbd_ref
def destroy_vdi(session, vdi_ref):
try:
session.call_xenapi('VDI.destroy', vdi_ref)
except session.XenAPI.Failure, exc:
LOG.exception(exc)
raise volume_utils.StorageError(
_('Unable to destroy VDI %s') % vdi_ref)
def safe_destroy_vdis(session, vdi_refs):
"""Destroys the requested VDIs, logging any StorageError exceptions."""
for vdi_ref in vdi_refs:
try:
destroy_vdi(session, vdi_ref)
except volume_utils.StorageError as exc:
LOG.error(exc)
def create_vdi(session, sr_ref, instance, name_label, disk_type, virtual_size,
read_only=False):
"""Create a VDI record and returns its reference."""
# create_vdi may be called simply while creating a volume
# hence information about instance may or may not be present
otherconf = {'nova_disk_type': disk_type}
if instance:
otherconf['nova_instance_uuid'] = instance['uuid']
vdi_ref = session.call_xenapi("VDI.create",
{'name_label': name_label,
'name_description': disk_type,
'SR': sr_ref,
'virtual_size': str(virtual_size),
'type': 'User',
'sharable': False,
'read_only': read_only,
'xenstore_data': {},
'other_config': otherconf,
'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
def get_vdis_for_boot_from_vol(session, dev_params):
vdis = {}
sr_uuid, label, sr_params = volume_utils.parse_sr_info(dev_params)
sr_ref = volume_utils.find_sr_by_uuid(session, sr_uuid)
# Try introducing SR if it is not present
if not sr_ref:
sr_ref = volume_utils.introduce_sr(session, sr_uuid, label, sr_params)
if sr_ref is None:
raise exception.NovaException(_('SR not present and could not be '
'introduced'))
else:
if 'vdi_uuid' in dev_params:
session.call_xenapi("SR.scan", sr_ref)
vdis = {'root': dict(uuid=dev_params['vdi_uuid'],
file=None, osvol=True)}
else:
try:
vdi_ref = volume_utils.introduce_vdi(session, sr_ref)
vdi_rec = session.call_xenapi("VDI.get_record", vdi_ref)
vdis = {'root': dict(uuid=vdi_rec['uuid'],
file=None, osvol=True)}
except volume_utils.StorageError, exc:
LOG.exception(exc)
volume_utils.forget_sr(session, sr_uuid)
return vdis
def _volume_in_mapping(mount_device, block_device_info):
block_device_list = [block_device.strip_prefix(vol['mount_device'])
for vol in
driver.block_device_info_get_mapping(
block_device_info)]
swap = driver.block_device_info_get_swap(block_device_info)
if driver.swap_is_usable(swap):
swap_dev = swap['device_name']
block_device_list.append(block_device.strip_prefix(swap_dev))
block_device_list += [block_device.strip_prefix(ephemeral['device_name'])
for ephemeral in
driver.block_device_info_get_ephemerals(
block_device_info)]
LOG.debug(_("block_device_list %s"), block_device_list)
return block_device.strip_prefix(mount_device) in block_device_list
def get_vdis_for_instance(context, session, instance, name_label, image,
image_type, block_device_info=None):
if block_device_info:
LOG.debug(_("block device info: %s"), block_device_info)
rootdev = block_device_info['root_device_name']
if _volume_in_mapping(rootdev, block_device_info):
# call function to return the vdi in connection info of block
# device.
# make it a point to return from here.
bdm_root_dev = block_device_info['block_device_mapping'][0]
dev_params = bdm_root_dev['connection_info']['data']
LOG.debug(dev_params)
return get_vdis_for_boot_from_vol(session, dev_params)
return _create_image(context, session, instance, name_label, image,
image_type)
@contextlib.contextmanager
def _dummy_vm(session, instance, vdi_ref):
"""This creates a temporary VM so that we can snapshot a VDI.
VDI's can't be snapshotted directly since the API expects a `vm_ref`. To
work around this, we need to create a temporary VM and then map the VDI to
the VM using a temporary VBD.
"""
name_label = "dummy"
vm_ref = create_vm(session, instance, name_label, None, None)
try:
vbd_ref = create_vbd(session, vm_ref, vdi_ref, 'autodetect',
read_only=True)
try:
yield vm_ref
finally:
try:
destroy_vbd(session, vbd_ref)
except volume_utils.StorageError:
# destroy_vbd() will log error
pass
finally:
destroy_vm(session, instance, vm_ref)
def _safe_copy_vdi(session, sr_ref, instance, vdi_to_copy_ref):
"""Copy a VDI and return the new VDIs reference.
This function differs from the XenAPI `VDI.copy` call in that the copy is
atomic and isolated, meaning we don't see half-downloaded images. It
accomplishes this by copying the VDI's into a temporary directory and then
atomically renaming them into the SR when the copy is completed.
The correct long term solution is to fix `VDI.copy` so that it is atomic
and isolated.
"""
with _dummy_vm(session, instance, vdi_to_copy_ref) as vm_ref:
label = "snapshot"
with snapshot_attached_here(
session, instance, vm_ref, label) as vdi_uuids:
imported_vhds = session.call_plugin_serialized(
'workarounds', 'safe_copy_vdis', sr_path=get_sr_path(session),
vdi_uuids=vdi_uuids, uuid_stack=_make_uuid_stack())
root_uuid = imported_vhds['root']['uuid']
# TODO(sirp): for safety, we should probably re-scan the SR after every
# call to a dom0 plugin, since there is a possibility that the underlying
# VHDs changed
scan_default_sr(session)
vdi_ref = session.call_xenapi('VDI.get_by_uuid', root_uuid)
return vdi_ref
def _clone_vdi(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
def set_vdi_name(session, vdi_uuid, label, description, vdi_ref=None):
vdi_ref = vdi_ref or session.call_xenapi('VDI.get_by_uuid', vdi_uuid)
session.call_xenapi('VDI.set_name_label', vdi_ref, label)
session.call_xenapi('VDI.set_name_description', vdi_ref, description)
def get_vdi_for_vm_safely(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.NovaException(_("No primary VDI found for %(vm_ref)s")
% locals())
@contextlib.contextmanager
def snapshot_attached_here(session, instance, vm_ref, label, *args):
update_task_state = None
if len(args) == 1:
update_task_state = args[0]
"""Snapshot the root disk only. Return a list of uuids for the vhds
in the chain.
"""
LOG.debug(_("Starting snapshot for VM"), instance=instance)
# Memorize the original_parent_uuid so we can poll for coalesce
vm_vdi_ref, vm_vdi_rec = get_vdi_for_vm_safely(session, vm_ref)
original_parent_uuid = _get_vhd_parent_uuid(session, vm_vdi_ref)
sr_ref = vm_vdi_rec["SR"]
snapshot_ref = session.call_xenapi("VDI.snapshot", vm_vdi_ref, {})
if update_task_state is not None:
update_task_state(task_state=task_states.IMAGE_PENDING_UPLOAD)
try:
snapshot_rec = session.call_xenapi("VDI.get_record", snapshot_ref)
_wait_for_vhd_coalesce(session, instance, sr_ref, vm_vdi_ref,
original_parent_uuid)
vdi_uuids = [vdi_rec['uuid'] for vdi_rec in
_walk_vdi_chain(session, snapshot_rec['uuid'])]
yield vdi_uuids
finally:
safe_destroy_vdis(session, [snapshot_ref])
def get_sr_path(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 = safe_find_sr(session)
sr_rec = session.call_xenapi("SR.get_record", sr_ref)
sr_uuid = sr_rec["uuid"]
return os.path.join(CONF.xenapi_sr_base_path, sr_uuid)
def destroy_cached_images(session, sr_ref, all_cached=False, dry_run=False):
"""Destroy used or unused cached images.
A cached image that is being used by at least one VM is said to be 'used'.
In the case of an 'unused' image, the cached image will be the only
descendent of the base-copy. So when we delete the cached-image, the
refcount will drop to zero and XenServer will automatically destroy the
base-copy for us.
The default behavior of this function is to destroy only 'unused' cached
images. To destroy all cached images, use the `all_cached=True` kwarg.
"""
cached_images = _find_cached_images(session, sr_ref)
destroyed = set()
def destroy_cached_vdi(vdi_uuid, vdi_ref):
LOG.debug(_("Destroying cached VDI '%(vdi_uuid)s'"))
if not dry_run:
destroy_vdi(session, vdi_ref)
destroyed.add(vdi_uuid)
for vdi_ref in cached_images.values():
vdi_uuid = session.call_xenapi('VDI.get_uuid', vdi_ref)
if all_cached:
destroy_cached_vdi(vdi_uuid, vdi_ref)
continue
# Unused-Only: Search for siblings
# Chain length greater than two implies a VM must be holding a ref to
# the base-copy (otherwise it would have coalesced), so consider this
# cached image used.
chain = list(_walk_vdi_chain(session, vdi_uuid))
if len(chain) > 2:
continue
elif len(chain) == 2:
# Siblings imply cached image is used
root_vdi_rec = chain[-1]
children = _child_vhds(session, sr_ref, root_vdi_rec['uuid'])
if len(children) > 1:
continue
destroy_cached_vdi(vdi_uuid, vdi_ref)
return destroyed
def _find_cached_images(session, sr_ref):
"""Return a dict(uuid=vdi_ref) representing all cached images."""
cached_images = {}
for vdi_ref, vdi_rec in _get_all_vdis_in_sr(session, sr_ref):
try:
image_id = vdi_rec['other_config']['image-id']
except KeyError:
continue
cached_images[image_id] = vdi_ref
return cached_images
def _find_cached_image(session, image_id, sr_ref):
"""Returns the vdi-ref of the cached image."""
cached_images = _find_cached_images(session, sr_ref)
return cached_images.get(image_id)
def upload_image(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(), instance=instance)
glance_api_servers = glance.get_api_servers()
glance_host, glance_port, glance_use_ssl = glance_api_servers.next()
properties = {
'auto_disk_config': instance['auto_disk_config'],
'os_type': instance['os_type'] or CONF.default_os_type,
}
params = {'vdi_uuids': vdi_uuids,
'image_id': image_id,
'glance_host': glance_host,
'glance_port': glance_port,
'glance_use_ssl': glance_use_ssl,
'sr_path': get_sr_path(session),
'auth_token': getattr(context, 'auth_token', None),
'properties': properties}
session.call_plugin_serialized('glance', 'upload_vhd', **params)
def resize_disk(session, instance, 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 = safe_find_sr(session)
copy_ref = session.call_xenapi('VDI.copy', vdi_ref, sr_ref)
try:
# Resize partition and filesystem down
auto_configure_disk(session, copy_ref, instance_type['root_gb'])
# Create new VDI
vdi_size = instance_type['root_gb'] * 1024 * 1024 * 1024
# NOTE(johannes): No resizing allowed for rescue instances, so
# using instance['name'] is safe here
new_ref = create_vdi(session, sr_ref, instance, instance['name'],
'root', vdi_size)
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:
destroy_vdi(session, copy_ref)
def auto_configure_disk(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)
def _generate_disk(session, instance, vm_ref, userdevice, name_label,
disk_type, 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 = safe_find_sr(session)
ONE_MEG = 1024 * 1024
virtual_size = size_mb * ONE_MEG
vdi_ref = create_vdi(session, sr_ref, instance, name_label, disk_type,
virtual_size)
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
create_vbd(session, vm_ref, vdi_ref, userdevice, bootable=False)
except Exception:
with excutils.save_and_reraise_exception():
destroy_vdi(session, vdi_ref)
def generate_swap(session, instance, vm_ref, userdevice, name_label, 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"
_generate_disk(session, instance, vm_ref, userdevice, name_label,
'swap', swap_mb, fs_type)
def generate_ephemeral(session, instance, vm_ref, userdevice, name_label,
size_gb):
_generate_disk(session, instance, vm_ref, userdevice, name_label,
'ephemeral', size_gb * 1024,
CONF.default_ephemeral_format)
def create_kernel_image(context, session, instance, name_label, image_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 CONF.cache_images:
args = {}
args['cached-image'] = image_id
args['new-image-uuid'] = str(uuid.uuid4())
filename = session.call_plugin('kernel', 'create_kernel_ramdisk', args)
if filename == "":
return _fetch_disk_image(context, session, instance, name_label,
image_id, image_type)
else:
vdi_type = ImageType.to_string(image_type)
return {vdi_type: dict(uuid=None, file=filename)}
def destroy_kernel_ramdisk(session, kernel, ramdisk):
args = {}
if kernel:
args['kernel-file'] = kernel
if ramdisk:
args['ramdisk-file'] = ramdisk
if args:
session.call_plugin('kernel', 'remove_kernel_ramdisk', args)
def _create_cached_image(context, session, instance, name_label,
image_id, image_type):
sr_ref = safe_find_sr(session)
sr_type = session.call_xenapi('SR.get_record', sr_ref)["type"]
vdis = {}
if CONF.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())
root_vdi_ref = _find_cached_image(session, image_id, sr_ref)
if root_vdi_ref is None:
vdis = _fetch_image(context, session, instance, name_label,
image_id, image_type)
root_vdi = vdis['root']
root_vdi_ref = session.call_xenapi('VDI.get_by_uuid',
root_vdi['uuid'])
set_vdi_name(session, root_vdi['uuid'], 'Glance Image %s' % image_id,
'root', vdi_ref=root_vdi_ref)
session.call_xenapi('VDI.add_to_other_config',
root_vdi_ref, 'image-id', str(image_id))
if CONF.use_cow_images and sr_type == 'ext':
new_vdi_ref = _clone_vdi(session, root_vdi_ref)
else:
new_vdi_ref = _safe_copy_vdi(session, sr_ref, instance, root_vdi_ref)
# Set the name label for the image we just created and remove image id
# field from other-config.
session.call_xenapi('VDI.remove_from_other_config',
new_vdi_ref, 'image-id')
vdi_type = ImageType.get_role(image_type)
vdi_uuid = session.call_xenapi('VDI.get_uuid', new_vdi_ref)
vdis[vdi_type] = dict(uuid=vdi_uuid, file=None)
return vdis
def _create_image(context, session, instance, name_label, image_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
"""
cache_images = CONF.cache_images.lower()
# Deterimine if the image is cacheable
if image_type == ImageType.DISK_ISO:
cache = False
elif cache_images == 'all':
cache = True
elif cache_images == 'some':
sys_meta = _system_metadata_to_dict(instance['system_metadata'])
try:
cache = utils.bool_from_str(sys_meta['image_cache_in_nova'])
except KeyError:
cache = False
elif cache_images == 'none':
cache = False
else:
LOG.warning(_("Unrecognized cache_images value '%s', defaulting to"
" True"), CONF.cache_images)
cache = True
# Fetch (and cache) the image
if cache:
vdis = _create_cached_image(context, session, instance, name_label,
image_id, image_type)
else:
vdis = _fetch_image(context, session, instance, name_label,
image_id, image_type)
# Set the name label and description to easily identify what
# instance and disk it's for
for vdi_type, vdi in vdis.iteritems():
set_vdi_name(session, vdi['uuid'], name_label, vdi_type)
return vdis
def _fetch_image(context, session, instance, name_label, image_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:
vdis = _fetch_vhd_image(context, session, instance, image_id)
else:
vdis = _fetch_disk_image(context, session, instance, name_label,
image_id, image_type)
for vdi_type, vdi in vdis.iteritems():
vdi_uuid = vdi['uuid']
LOG.debug(_("Fetched VDIs of type '%(vdi_type)s' with UUID"
" '%(vdi_uuid)s'"),
locals(), instance=instance)
return vdis
def _fetch_using_dom0_plugin_with_retry(context, session, image_id,
plugin_name, params, callback=None):
max_attempts = CONF.glance_num_retries + 1
sleep_time = 0.5
for attempt_num in xrange(1, max_attempts + 1):
LOG.info(_('download_vhd %(image_id)s, '
'attempt %(attempt_num)d/%(max_attempts)d, '
'params: %(params)s') % locals())
try:
if callback:
callback(params)
return session.call_plugin_serialized(
plugin_name, 'download_vhd', **params)
except session.XenAPI.Failure as exc:
_type, _method, error = exc.details[:3]
if error == 'RetryableError':
LOG.error(_('download_vhd failed: %r') %
(exc.details[3:],))
else:
raise
time.sleep(sleep_time)
sleep_time = min(2 * sleep_time, 15)
raise exception.CouldNotFetchImage(image_id=image_id)
def _make_uuid_stack():
# NOTE(sirp): The XenAPI plugins run 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
return [str(uuid.uuid4()) for i in xrange(MAX_VDI_CHAIN_SIZE)]
def _image_uses_bittorrent(context, instance):
bittorrent = False
xenapi_torrent_images = CONF.xenapi_torrent_images.lower()
if xenapi_torrent_images == 'all':
bittorrent = True
elif xenapi_torrent_images == 'some':
sys_meta = _system_metadata_to_dict(instance['system_metadata'])
try:
bittorrent = utils.bool_from_str(sys_meta['image_bittorrent'])
except KeyError:
pass
elif xenapi_torrent_images == 'none':
pass
else:
LOG.warning(_("Invalid value '%s' for xenapi_torrent_images"),
xenapi_torrent_images)
return bittorrent
def _fetch_vhd_image(context, session, instance, image_id):
"""Tell glance to download an image and put the VHDs into the SR
Returns: A list of dictionaries that describe VDIs
"""
LOG.debug(_("Asking xapi to fetch vhd image %(image_id)s"), locals(),
instance=instance)
params = {'image_id': image_id,
'uuid_stack': _make_uuid_stack(),
'sr_path': get_sr_path(session)}
if _image_uses_bittorrent(context, instance):
plugin_name = 'bittorrent'
callback = None
params['torrent_base_url'] = CONF.xenapi_torrent_base_url
params['torrent_seed_duration'] = CONF.xenapi_torrent_seed_duration
params['torrent_seed_chance'] = CONF.xenapi_torrent_seed_chance
params['torrent_max_last_accessed'] =\
CONF.xenapi_torrent_max_last_accessed
params['torrent_listen_port_start'] =\
CONF.xenapi_torrent_listen_port_start
params['torrent_listen_port_end'] =\
CONF.xenapi_torrent_listen_port_end
params['torrent_download_stall_cutoff'] =\
CONF.xenapi_torrent_download_stall_cutoff
params['torrent_max_seeder_processes_per_host'] =\
CONF.xenapi_torrent_max_seeder_processes_per_host
else:
plugin_name = 'glance'
glance_api_servers = glance.get_api_servers()
def pick_glance(params):
g_host, g_port, g_use_ssl = glance_api_servers.next()
params['glance_host'] = g_host
params['glance_port'] = g_port
params['glance_use_ssl'] = g_use_ssl
params['auth_token'] = getattr(context, 'auth_token', None)
callback = pick_glance
vdis = _fetch_using_dom0_plugin_with_retry(
context, session, image_id, plugin_name, params,
callback=callback)
sr_ref = safe_find_sr(session)
_scan_sr(session, sr_ref)
# Pull out the UUID of the root VDI
root_vdi_uuid = vdis['root']['uuid']
# Set the name-label to ease debugging
set_vdi_name(session, root_vdi_uuid, instance['name'], 'root')
_check_vdi_size(context, session, instance, root_vdi_uuid)
return vdis
def _get_vdi_chain_size(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
def _check_vdi_size(context, session, instance, vdi_uuid):
size_bytes = _get_vdi_chain_size(session, vdi_uuid)
# FIXME(jk0): this was copied directly from compute.manager.py, let's
# refactor this to a common area
instance_type = instance['instance_type']
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(), instance=instance)
if size_bytes > allowed_size_bytes:
LOG.info(_("Image size %(size_bytes)d exceeded instance_type "
"allowed size %(allowed_size_bytes)d"),
locals(), instance=instance)
raise exception.ImageTooLarge()
def _fetch_disk_image(context, session, instance, name_label, image_id,
image_type):
"""Fetch the image from Glance
NOTE:
Unlike _fetch_vhd_image, 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
"""
# 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
image_type_str = ImageType.to_string(image_type)
LOG.debug(_("Fetching image %(image_id)s, type %(image_type_str)s"),
locals(), instance=instance)
if image_type == ImageType.DISK_ISO:
sr_ref = _safe_find_iso_sr(session)
else:
sr_ref = safe_find_sr(session)
image_service, image_id = glance.get_remote_image_service(
context, image_id)
meta = image_service.show(context, image_id)
virtual_size = int(meta['size'])
vdi_size = virtual_size
LOG.debug(_("Size for image %(image_id)s: %(virtual_size)d"), locals(),
instance=instance)
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 > CONF.max_kernel_ramdisk_size):
max_size = CONF.max_kernel_ramdisk_size
raise exception.NovaException(
_("Kernel/Ramdisk image is too large: %(vdi_size)d bytes, "
"max %(max_size)d bytes") % locals())
vdi_ref = create_vdi(session, sr_ref, instance, name_label,
image_type_str, vdi_size)
# 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_func = lambda f: image_service.download(
context, image_id, f)
_stream_disk(stream_func, image_type, virtual_size, dev)
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, instance=instance)
args = {}
args['vdi-ref'] = vdi_ref
# Let the plugin copy the correct number of bytes.
args['image-size'] = str(vdi_size)
if CONF.cache_images:
args['cached-image'] = image_id
filename = session.call_plugin('kernel', 'copy_vdi', args)
# Remove the VDI as it is not needed anymore.
destroy_vdi(session, vdi_ref)
LOG.debug(_("Kernel/Ramdisk VDI %s destroyed"), vdi_ref,
instance=instance)
vdi_role = ImageType.get_role(image_type)
return {vdi_role: dict(uuid=None, file=filename)}
else:
vdi_role = ImageType.get_role(image_type)
return {vdi_role: dict(uuid=vdi_uuid, file=None)}
except (session.XenAPI.Failure, IOError, OSError) as e:
# We look for XenAPI and OS failures.
LOG.exception(_("Failed to fetch glance image"),
instance=instance)
e.args = e.args + ([dict(type=ImageType.to_string(image_type),
uuid=vdi_uuid,
file=filename)],)
raise
def determine_disk_image_type(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.
"""
if not image_meta:
return None
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
def determine_is_pv(session, 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
5. Boot From Volume - without image metadata (None): attempt to
use Pygrub to figure out if the volume stores a PV VM or a
HVM one. Log a warning, because there may be cases where the
volume is RAW (in which case using pygrub is fine) and cases
where the content of the volume is VHD, and pygrub might not
work as expected.
NOTE: if disk_image_type is not specified, instances launched
from remote volumes will have to include kernel and ramdisk
because external kernel and ramdisk will not be fetched.
"""
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
elif not disk_image_type:
LOG.warning(_("Image format is None: trying to determine PV status "
"using pygrub; if instance with vdi %s does not boot "
"correctly, try with image metadata.") % vdi_ref)
with vdi_attached_here(session, vdi_ref, read_only=True) as dev:
is_pv = _is_vdi_pv(dev)
else:
msg = _("Unknown image format %(disk_image_type)s") % locals()
raise exception.NovaException(msg)
return is_pv
def set_vm_name_label(session, vm_ref, name_label):
session.call_xenapi("VM.set_name_label", vm_ref, name_label)
def list_vms(session):
for vm_ref, vm_rec in session.get_all_refs_and_recs('VM'):
if (vm_rec["resident_on"] != session.get_xenapi_host() or
vm_rec["is_a_template"] or vm_rec["is_control_domain"]):
continue
else:
yield vm_ref, vm_rec
def lookup_vm_vdis(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'])
vbd_other_config = session.call_xenapi("VBD.get_other_config",
vbd_ref)
if not vbd_other_config.get('osvol'):
# This is not an attached volume
vdi_refs.append(vdi_ref)
except session.XenAPI.Failure, exc:
LOG.exception(exc)
return vdi_refs
def lookup(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]
def preconfigure_instance(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:
return
with vdi_attached_here(session, vdi_ref, read_only=False) as dev:
_mounted_processing(dev, key, net, metadata)
def lookup_kernel_ramdisk(session, vm):
vm_rec = session.call_xenapi("VM.get_record", vm)
if 'PV_kernel' in vm_rec and 'PV_ramdisk' in vm_rec:
return (vm_rec['PV_kernel'], vm_rec['PV_ramdisk'])
else:
return (None, None)
def is_snapshot(session, vm):
vm_rec = session.call_xenapi("VM.get_record", vm)
if 'is_a_template' in vm_rec and 'is_a_snapshot' in vm_rec:
return vm_rec['is_a_template'] and vm_rec['is_a_snapshot']
else:
return False
def compile_info(record):
"""Fill record with VM status information."""
return {'state': XENAPI_POWER_STATE[record['power_state']],
'max_mem': long(record['memory_static_max']) >> 10,
'mem': long(record['memory_dynamic_max']) >> 10,
'num_cpu': record['VCPUs_max'],
'cpu_time': 0}
def compile_diagnostics(record):
"""Compile VM diagnostics data."""
try:
keys = []
diags = {}
vm_uuid = record["uuid"]
xml = _get_rrd(_get_rrd_server(), vm_uuid)
if xml:
rrd = minidom.parseString(xml)
for i, node in enumerate(rrd.firstChild.childNodes):
# Provide the last update of the information
if node.localName == 'lastupdate':
diags['last_update'] = node.firstChild.data
# Create a list of the diagnostic keys (in their order)
if node.localName == 'ds':
ref = node.childNodes
# Name and Value
if len(ref) > 6:
keys.append(ref[0].firstChild.data)
# Read the last row of the first RRA to get the latest info
if node.localName == 'rra':
rows = node.childNodes[4].childNodes
last_row = rows[rows.length - 1].childNodes
for j, value in enumerate(last_row):
diags[keys[j]] = value.firstChild.data
break
return diags
except expat.ExpatError as e:
LOG.exception(_('Unable to parse rrd of %(vm_uuid)s') % locals())
return {"Unable to retrieve diagnostics": e}
def fetch_bandwidth(session):
bw = session.call_plugin_serialized('bandwidth', 'fetch_all_bandwidth')
return bw
def compile_metrics(start_time, stop_time=None):
"""Compile bandwidth usage, cpu, and disk metrics for all VMs on
this host.
Note that some stats, like bandwith, do not seem to be very
accurate in some of the data from XenServer (mdragon). """
start_time = int(start_time)
xml = _get_rrd_updates(_get_rrd_server(), start_time)
if xml:
doc = minidom.parseString(xml)
return _parse_rrd_update(doc, start_time, stop_time)
raise exception.CouldNotFetchMetrics()
def _scan_sr(session, sr_ref=None):
"""Scans the SR specified by sr_ref."""
if sr_ref:
LOG.debug(_("Re-scanning SR %s"), sr_ref)
session.call_xenapi('SR.scan', sr_ref)
def scan_default_sr(session):
"""Looks for the system default SR and triggers a re-scan."""
_scan_sr(session, _find_sr(session))
def safe_find_sr(session):
"""Same as _find_sr except raises a NotFound exception if SR cannot be
determined
"""
sr_ref = _find_sr(session)
if sr_ref is None:
raise exception.StorageRepositoryNotFound()
return sr_ref
def _find_sr(session):
"""Return the storage repository to hold VM images."""
host = session.get_xenapi_host()
try:
tokens = CONF.sr_matching_filter.split(':')
filter_criteria = tokens[0]
filter_pattern = tokens[1]
except IndexError:
# oops, flag is invalid
LOG.warning(_("Flag sr_matching_filter '%s' does not respect "
"formatting convention"), CONF.sr_matching_filter)
return None
if filter_criteria == 'other-config':
key, value = filter_pattern.split('=', 1)
for sr_ref, sr_rec in session.get_all_refs_and_recs('SR'):
if not (key in sr_rec['other_config'] and
sr_rec['other_config'][key] == value):
continue
for pbd_ref in sr_rec['PBDs']:
pbd_rec = session.get_rec('PBD', pbd_ref)
if pbd_rec and pbd_rec['host'] == host:
return sr_ref
elif filter_criteria == 'default-sr' and filter_pattern == 'true':
pool_ref = session.call_xenapi('pool.get_all')[0]
return session.call_xenapi('pool.get_default_SR', pool_ref)
# No SR found!
LOG.warning(_("XenAPI is unable to find a Storage Repository to "
"install guest instances on. Please check your "
"configuration and/or configure the flag "
"'sr_matching_filter'"))
return None
def _safe_find_iso_sr(session):
"""Same as _find_iso_sr except raises a NotFound exception if SR
cannot be determined
"""
sr_ref = _find_iso_sr(session)
if sr_ref is None:
raise exception.NotFound(_('Cannot find SR of content-type ISO'))
return sr_ref
def _find_iso_sr(session):
"""Return the storage repository to hold ISO images."""
host = session.get_xenapi_host()
for sr_ref, sr_rec in session.get_all_refs_and_recs('SR'):
LOG.debug(_("ISO: looking at SR %(sr_rec)s") % locals())
if not sr_rec['content_type'] == 'iso':
LOG.debug(_("ISO: not iso content"))
continue
if not 'i18n-key' in sr_rec['other_config']:
LOG.debug(_("ISO: iso content_type, no 'i18n-key' key"))
continue
if not sr_rec['other_config']['i18n-key'] == 'local-storage-iso':
LOG.debug(_("ISO: iso content_type, i18n-key value not "
"'local-storage-iso'"))
continue
LOG.debug(_("ISO: SR MATCHing our criteria"))
for pbd_ref in sr_rec['PBDs']:
LOG.debug(_("ISO: ISO, looking to see if it is host local"))
pbd_rec = session.get_rec('PBD', pbd_ref)
if not pbd_rec:
LOG.debug(_("ISO: PBD %(pbd_ref)s disappeared") % locals())
continue
pbd_rec_host = pbd_rec['host']
LOG.debug(_("ISO: PBD matching, want %(pbd_rec)s, "
"have %(host)s") % locals())
if pbd_rec_host == host:
LOG.debug(_("ISO: SR with local PBD"))
return sr_ref
return None
def _get_rrd_server():
"""Return server's scheme and address to use for retrieving RRD XMLs."""
xs_url = urlparse.urlparse(CONF.xenapi_connection_url)
return [xs_url.scheme, xs_url.netloc]
def _get_rrd(server, vm_uuid):
"""Return the VM RRD XML as a string."""
try:
xml = urllib.urlopen("%s://%s:%s@%s/vm_rrd?uuid=%s" % (
server[0],
CONF.xenapi_connection_username,
CONF.xenapi_connection_password,
server[1],
vm_uuid))
return xml.read()
except IOError:
LOG.exception(_('Unable to obtain RRD XML for VM %(vm_uuid)s with '
'server details: %(server)s.') % locals())
return None
def _get_rrd_updates(server, start_time):
"""Return the RRD updates XML as a string."""
try:
xml = urllib.urlopen("%s://%s:%s@%s/rrd_updates?start=%s" % (
server[0],
CONF.xenapi_connection_username,
CONF.xenapi_connection_password,
server[1],
start_time))
return xml.read()
except IOError:
LOG.exception(_('Unable to obtain RRD XML updates with '
'server details: %(server)s.') % locals())
return None
def _parse_rrd_meta(doc):
data = {}
meta = doc.getElementsByTagName('meta')[0]
for tag in ('start', 'end', 'step'):
data[tag] = int(meta.getElementsByTagName(tag)[0].firstChild.data)
legend = meta.getElementsByTagName('legend')[0]
data['legend'] = [child.firstChild.data for child in legend.childNodes]
return data
def _parse_rrd_data(doc):
dnode = doc.getElementsByTagName('data')[0]
return [dict(
time=int(child.getElementsByTagName('t')[0].firstChild.data),
values=[decimal.Decimal(valnode.firstChild.data)
for valnode in child.getElementsByTagName('v')])
for child in dnode.childNodes]
def _parse_rrd_update(doc, start, until=None):
sum_data = {}
meta = _parse_rrd_meta(doc)
data = _parse_rrd_data(doc)
for col, collabel in enumerate(meta['legend']):
_datatype, _objtype, uuid, name = collabel.split(':')
vm_data = sum_data.get(uuid, dict())
if name.startswith('vif'):
vm_data[name] = _integrate_series(data, col, start, until)
else:
vm_data[name] = _average_series(data, col, until)
sum_data[uuid] = vm_data
return sum_data
def _average_series(data, col, until=None):
vals = [row['values'][col] for row in data
if (not until or (row['time'] <= until)) and
row['values'][col].is_finite()]
if vals:
try:
return (sum(vals) / len(vals)).quantize(decimal.Decimal('1.0000'))
except decimal.InvalidOperation:
# (mdragon) Xenserver occasionally returns odd values in
# data that will throw an error on averaging (see bug 918490)
# These are hard to find, since, whatever those values are,
# Decimal seems to think they are a valid number, sortof.
# We *think* we've got the the cases covered, but just in
# case, log and return NaN, so we don't break reporting of
# other statistics.
LOG.error(_("Invalid statistics data from Xenserver: %s")
% str(vals))
return decimal.Decimal('NaN')
else:
return decimal.Decimal('0.0000')
def _integrate_series(data, col, start, until=None):
total = decimal.Decimal('0.0000')
prev_time = int(start)
prev_val = None
for row in reversed(data):
if not until or (row['time'] <= until):
time = row['time']
val = row['values'][col]
if val.is_nan():
val = decimal.Decimal('0.0000')
if prev_val is None:
prev_val = val
if prev_val >= val:
total += ((val * (time - prev_time)) +
(decimal.Decimal('0.5000') * (prev_val - val) *
(time - prev_time)))
else:
total += ((prev_val * (time - prev_time)) +
(decimal.Decimal('0.5000') * (val - prev_val) *
(time - prev_time)))
prev_time = time
prev_val = val
return total.quantize(decimal.Decimal('1.0000'))
def _get_all_vdis_in_sr(session, sr_ref):
for vdi_ref in session.call_xenapi('SR.get_VDIs', sr_ref):
try:
vdi_rec = session.call_xenapi('VDI.get_record', vdi_ref)
yield vdi_ref, vdi_rec
except session.XenAPI.Failure:
continue
def get_instance_vdis_for_sr(session, vm_ref, sr_ref):
"""Return opaqueRef for all the vdis which live on sr."""
for vbd_ref in session.call_xenapi('VM.get_VBDs', vm_ref):
try:
vdi_ref = session.call_xenapi('VBD.get_VDI', vbd_ref)
if sr_ref == session.call_xenapi('VDI.get_SR', vdi_ref):
yield vdi_ref
except session.XenAPI.Failure:
continue
def _get_vhd_parent_uuid(session, vdi_ref):
vdi_rec = session.call_xenapi("VDI.get_record", vdi_ref)
if 'vhd-parent' not in vdi_rec['sm_config']:
return None
parent_uuid = vdi_rec['sm_config']['vhd-parent']
vdi_uuid = vdi_rec['uuid']
LOG.debug(_("VHD %(vdi_uuid)s has parent %(parent_uuid)s") % locals())
return parent_uuid
def _walk_vdi_chain(session, vdi_uuid):
"""Yield vdi_recs for each element in a VDI chain."""
scan_default_sr(session)
while True:
vdi_ref = session.call_xenapi("VDI.get_by_uuid", vdi_uuid)
vdi_rec = session.call_xenapi("VDI.get_record", vdi_ref)
yield vdi_rec
parent_uuid = _get_vhd_parent_uuid(session, vdi_ref)
if not parent_uuid:
break
vdi_uuid = parent_uuid
def _child_vhds(session, sr_ref, vdi_uuid):
"""Return the immediate children of a given VHD.
This is not recursive, only the immediate children are returned.
"""
children = set()
for ref, rec in _get_all_vdis_in_sr(session, sr_ref):
rec_uuid = rec['uuid']
if rec_uuid == vdi_uuid:
continue
parent_uuid = _get_vhd_parent_uuid(session, ref)
if parent_uuid != vdi_uuid:
continue
children.add(rec_uuid)
return children
def _wait_for_vhd_coalesce(session, instance, sr_ref, vdi_ref,
original_parent_uuid):
"""Spin until the parent VHD is coalesced into its parent VHD
Before coalesce:
* original_parent_vhd
* parent_vhd
snapshot
After coalesce:
* parent_vhd
snapshot
"""
def _another_child_vhd():
if not original_parent_uuid:
return False
# Search for any other vdi which parents to original parent and is not
# in the active vm/instance vdi chain.
vdi_uuid = session.call_xenapi('VDI.get_record', vdi_ref)['uuid']
parent_vdi_uuid = _get_vhd_parent_uuid(session, vdi_ref)
for _ref, rec in _get_all_vdis_in_sr(session, sr_ref):
if ((rec['uuid'] != vdi_uuid) and
(rec['uuid'] != parent_vdi_uuid) and
(rec['sm_config'].get('vhd-parent') == original_parent_uuid)):
# Found another vhd which too parents to original parent.
return True
# Found no other vdi with the same parent.
return False
# Check if original parent has any other child. If so, coalesce will
# not take place.
if _another_child_vhd():
parent_uuid = _get_vhd_parent_uuid(session, vdi_ref)
parent_ref = session.call_xenapi("VDI.get_by_uuid", parent_uuid)
base_uuid = _get_vhd_parent_uuid(session, parent_ref)
return parent_uuid, base_uuid
# NOTE(sirp): This rescan is necessary to ensure the VM's `sm_config`
# matches the underlying VHDs.
_scan_sr(session, sr_ref)
max_attempts = CONF.xenapi_vhd_coalesce_max_attempts
for i in xrange(max_attempts):
_scan_sr(session, sr_ref)
parent_uuid = _get_vhd_parent_uuid(session, vdi_ref)
if original_parent_uuid and (parent_uuid != original_parent_uuid):
LOG.debug(_("Parent %(parent_uuid)s doesn't match original parent"
" %(original_parent_uuid)s, waiting for coalesce..."),
locals(), instance=instance)
else:
parent_ref = session.call_xenapi("VDI.get_by_uuid", parent_uuid)
base_uuid = _get_vhd_parent_uuid(session, parent_ref)
return parent_uuid, base_uuid
greenthread.sleep(CONF.xenapi_vhd_coalesce_poll_interval)
msg = (_("VHD coalesce attempts exceeded (%(max_attempts)d)"
", giving up...") % locals())
raise exception.NovaException(msg)
def _remap_vbd_dev(dev):
"""Return the appropriate location for a plugged-in VBD device
Ubuntu Maverick moved xvd? -> sd?. This is considered a bug and will be
fixed in future versions:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/684875
For now, we work around it by just doing a string replace.
"""
# NOTE(sirp): This hack can go away when we pull support for Maverick
should_remap = CONF.xenapi_remap_vbd_dev
if not should_remap:
return dev
old_prefix = 'xvd'
new_prefix = CONF.xenapi_remap_vbd_dev_prefix
remapped_dev = dev.replace(old_prefix, new_prefix)
return remapped_dev
def _wait_for_device(dev):
"""Wait for device node to appear."""
for i in xrange(0, CONF.block_device_creation_timeout):
dev_path = utils.make_dev_path(dev)
if os.path.exists(dev_path):
return
time.sleep(1)
raise volume_utils.StorageError(
_('Timeout waiting for device %s to be created') % dev)
def cleanup_attached_vdis(session):
"""Unplug any instance VDIs left after an unclean restart."""
this_vm_ref = _get_this_vm_ref(session)
vbd_refs = session.call_xenapi('VM.get_VBDs', this_vm_ref)
for vbd_ref in vbd_refs:
try:
vbd_rec = session.call_xenapi('VBD.get_record', vbd_ref)
vdi_rec = session.call_xenapi('VDI.get_record', vbd_rec['VDI'])
except session.XenAPI.Failure, e:
if e.details[0] != 'HANDLE_INVALID':
raise
continue
if 'nova_instance_uuid' in vdi_rec['other_config']:
# Belongs to an instance and probably left over after an
# unclean restart
LOG.info(_('Disconnecting stale VDI %s from compute domU'),
vdi_rec['uuid'])
unplug_vbd(session, vbd_ref)
destroy_vbd(session, vbd_ref)
@contextlib.contextmanager
def vdi_attached_here(session, vdi_ref, read_only=False):
this_vm_ref = _get_this_vm_ref(session)
vbd_ref = create_vbd(session, this_vm_ref, vdi_ref, 'autodetect',
read_only=read_only, bootable=False)
try:
LOG.debug(_('Plugging VBD %s ... '), vbd_ref)
session.call_xenapi("VBD.plug", vbd_ref)
try:
LOG.debug(_('Plugging VBD %s done.'), vbd_ref)
orig_dev = session.call_xenapi("VBD.get_device", vbd_ref)
LOG.debug(_('VBD %(vbd_ref)s plugged as %(orig_dev)s') % locals())
dev = _remap_vbd_dev(orig_dev)
if dev != orig_dev:
LOG.debug(_('VBD %(vbd_ref)s plugged into wrong dev, '
'remapping to %(dev)s') % locals())
_wait_for_device(dev)
yield dev
finally:
LOG.debug(_('Destroying VBD for VDI %s ... '), vdi_ref)
unplug_vbd(session, vbd_ref)
finally:
try:
destroy_vbd(session, vbd_ref)
except volume_utils.StorageError:
# destroy_vbd() will log error
pass
LOG.debug(_('Destroying VBD for VDI %s done.'), vdi_ref)
def get_this_vm_uuid():
with file('/sys/hypervisor/uuid') as f:
return f.readline().strip()
def _get_this_vm_ref(session):
return session.call_xenapi("VM.get_by_uuid", get_this_vm_uuid())
def _is_vdi_pv(dev):
LOG.debug(_("Running pygrub against %s"), dev)
dev_path = utils.make_dev_path(dev)
try:
out, err = utils.execute('pygrub', '-qn', dev_path, run_as_root=True)
for line in out:
# try to find kernel string
m = re.search('(?<=kernel:)/.*(?:>)', line)
if m and m.group(0).find('xen') != -1:
LOG.debug(_("Found Xen kernel %s") % m.group(0))
return True
LOG.debug(_("No Xen kernel found. Booting HVM."))
except exception.ProcessExecutionError:
LOG.exception(_("Error while executing pygrub! Please, ensure the "
"binary is installed correctly, and available in your "
"PATH; on some Linux distros, pygrub may be installed "
"in /usr/lib/xen-X.Y/bin/pygrub. Attempting to boot "
"in HVM mode."))
return False
def _get_partitions(dev):
"""Return partition information (num, size, type) for a device."""
dev_path = utils.make_dev_path(dev)
out, _err = utils.execute('parted', '--script', '--machine',
dev_path, 'unit s', 'print',
run_as_root=True)
lines = [line for line in out.split('\n') if line]
partitions = []
LOG.debug(_("Partitions:"))
for line in lines[2:]:
num, start, end, size, ptype = line.split(':')[:5]
start = int(start.rstrip('s'))
end = int(end.rstrip('s'))
size = int(size.rstrip('s'))
LOG.debug(_(" %(num)s: %(ptype)s %(size)d sectors") % locals())
partitions.append((num, start, size, ptype))
return partitions
def _stream_disk(image_service_func, image_type, virtual_size, dev):
offset = 0
if image_type == ImageType.DISK:
offset = MBR_SIZE_BYTES
_write_partition(virtual_size, dev)
dev_path = utils.make_dev_path(dev)
with utils.temporary_chown(dev_path):
with open(dev_path, 'wb') as f:
f.seek(offset)
image_service_func(f)
def _write_partition(virtual_size, dev):
dev_path = utils.make_dev_path(dev)
primary_first = MBR_SIZE_SECTORS
primary_last = MBR_SIZE_SECTORS + (virtual_size / SECTOR_SIZE) - 1
LOG.debug(_('Writing partition table %(primary_first)d %(primary_last)d'
' to %(dev_path)s...'), locals())
def execute(*cmd, **kwargs):
return utils.execute(*cmd, **kwargs)
execute('parted', '--script', dev_path, 'mklabel', 'msdos',
run_as_root=True)
execute('parted', '--script', dev_path, 'mkpart', 'primary',
'%ds' % primary_first,
'%ds' % primary_last,
run_as_root=True)
LOG.debug(_('Writing partition table %s done.'), dev_path)
def _resize_part_and_fs(dev, start, old_sectors, new_sectors):
"""Resize partition and fileystem.
This assumes we are dealing with a single primary partition and using
ext3 or ext4.
"""
size = new_sectors - start
end = new_sectors - 1
dev_path = utils.make_dev_path(dev)
partition_path = utils.make_dev_path(dev, partition=1)
# Replay journal if FS wasn't cleanly unmounted
# Exit Code 1 = File system errors corrected
# 2 = File system errors corrected, system needs a reboot
utils.execute('e2fsck', '-f', '-y', partition_path, run_as_root=True,
check_exit_code=[0, 1, 2])
# Remove ext3 journal (making it ext2)
utils.execute('tune2fs', '-O ^has_journal', partition_path,
run_as_root=True)
if new_sectors < old_sectors:
# Resizing down, resize filesystem before partition resize
utils.execute('resize2fs', partition_path, '%ds' % size,
run_as_root=True)
utils.execute('parted', '--script', dev_path, 'rm', '1',
run_as_root=True)
utils.execute('parted', '--script', dev_path, 'mkpart',
'primary',
'%ds' % start,
'%ds' % end,
run_as_root=True)
if new_sectors > old_sectors:
# Resizing up, resize filesystem after partition resize
utils.execute('resize2fs', partition_path, run_as_root=True)
# Add back journal
utils.execute('tune2fs', '-j', partition_path, run_as_root=True)
def _sparse_copy(src_path, dst_path, virtual_size, block_size=4096):
"""Copy data, skipping long runs of zeros to create a sparse file."""
start_time = time.time()
EMPTY_BLOCK = '\0' * block_size
bytes_read = 0
skipped_bytes = 0
left = virtual_size
LOG.debug(_("Starting sparse_copy src=%(src_path)s dst=%(dst_path)s "
"virtual_size=%(virtual_size)d block_size=%(block_size)d"),
locals())
# NOTE(sirp): we need read/write access to the devices; since we don't have
# the luxury of shelling out to a sudo'd command, we temporarily take
# ownership of the devices.
with utils.temporary_chown(src_path):
with utils.temporary_chown(dst_path):
with open(src_path, "r") as src:
with open(dst_path, "w") as dst:
data = src.read(min(block_size, left))
while data:
if data == EMPTY_BLOCK:
dst.seek(block_size, os.SEEK_CUR)
left -= block_size
bytes_read += block_size
skipped_bytes += block_size
else:
dst.write(data)
data_len = len(data)
left -= data_len
bytes_read += data_len
if left <= 0:
break
data = src.read(min(block_size, left))
duration = time.time() - start_time
compression_pct = float(skipped_bytes) / bytes_read * 100
LOG.debug(_("Finished sparse_copy in %(duration).2f secs, "
"%(compression_pct).2f%% reduction in size"), locals())
def _copy_partition(session, src_ref, dst_ref, partition, virtual_size):
# Part of disk taken up by MBR
virtual_size -= MBR_SIZE_BYTES
with vdi_attached_here(session, src_ref, read_only=True) as src:
src_path = utils.make_dev_path(src, partition=partition)
with vdi_attached_here(session, dst_ref, read_only=False) as dst:
dst_path = utils.make_dev_path(dst, partition=partition)
_write_partition(virtual_size, dst)
if CONF.xenapi_sparse_copy:
_sparse_copy(src_path, dst_path, virtual_size)
else:
num_blocks = virtual_size / SECTOR_SIZE
utils.execute('dd',
'if=%s' % src_path,
'of=%s' % dst_path,
'count=%d' % num_blocks,
run_as_root=True)
def _mount_filesystem(dev_path, dir):
"""mounts the device specified by dev_path in dir."""
try:
_out, err = utils.execute('mount',
'-t', 'ext2,ext3,ext4,reiserfs',
dev_path, dir, run_as_root=True)
except exception.ProcessExecutionError as e:
err = str(e)
return err
def _mounted_processing(device, key, net, metadata):
"""Callback which runs with the image VDI attached."""
# NB: Partition 1 hardcoded
dev_path = utils.make_dev_path(device, partition=1)
with utils.tempdir() as tmpdir:
# Mount only Linux filesystems, to avoid disturbing NTFS images
err = _mount_filesystem(dev_path, tmpdir)
if not err:
try:
# This try block ensures that the umount occurs
if not agent.find_guest_agent(tmpdir):
vfs = vfsimpl.VFSLocalFS(imgfile=None,
imgfmt=None,
imgdir=tmpdir)
LOG.info(_('Manipulating interface files directly'))
# for xenapi, we don't 'inject' admin_password here,
# it's handled at instance startup time, nor do we
# support injecting arbitrary files here.
disk.inject_data_into_fs(vfs,
key, net, metadata, None, None)
finally:
utils.execute('umount', dev_path, run_as_root=True)
else:
LOG.info(_('Failed to mount filesystem (expected for '
'non-linux instances): %s') % err)
def _prepare_injectables(inst, network_info):
"""
prepares the ssh key and the network configuration file to be
injected into the disk image
"""
#do the import here - Cheetah.Template will be loaded
#only if injection is performed
from Cheetah import Template as t
template = t.Template
template_data = open(CONF.injected_network_template).read()
metadata = inst['metadata']
key = str(inst['key_data'])
net = None
if network_info:
ifc_num = -1
interfaces_info = []
for vif in network_info:
ifc_num += 1
try:
if not vif['network'].get_meta('injected'):
# network is not specified injected
continue
except KeyError:
# vif network is None
continue
# NOTE(tr3buchet): using all subnets in case dns is stored in a
# subnet that isn't chosen as first v4 or v6
# subnet in the case where there is more than one
# dns = list of address of each dns entry from each vif subnet
dns = [ip['address'] for subnet in vif['network']['subnets']
for ip in subnet['dns']]
dns = ' '.join(dns).strip()
interface_info = {'name': 'eth%d' % ifc_num,
'address': '',
'netmask': '',
'gateway': '',
'broadcast': '',
'dns': dns or '',
'address_v6': '',
'netmask_v6': '',
'gateway_v6': '',
'use_ipv6': CONF.use_ipv6}
# NOTE(tr3buchet): the original code used the old network_info
# which only supported a single ipv4 subnet
# (and optionally, a single ipv6 subnet).
# I modified it to use the new network info model,
# which adds support for multiple v4 or v6
# subnets. I chose to ignore any additional
# subnets, just as the original code ignored
# additional IP information
# populate v4 info if v4 subnet and ip exist
try:
# grab the first v4 subnet (or it raises)
subnet = [s for s in vif['network']['subnets']
if s['version'] == 4][0]
# get the subnet's first ip (or it raises)
ip = subnet['ips'][0]
# populate interface_info
subnet_netaddr = subnet.as_netaddr()
interface_info['address'] = ip['address']
interface_info['netmask'] = subnet_netaddr.netmask
interface_info['gateway'] = subnet['gateway']['address']
interface_info['broadcast'] = subnet_netaddr.broadcast
except IndexError:
# there isn't a v4 subnet or there are no ips
pass
# populate v6 info if v6 subnet and ip exist
try:
# grab the first v6 subnet (or it raises)
subnet = [s for s in vif['network']['subnets']
if s['version'] == 6][0]
# get the subnet's first ip (or it raises)
ip = subnet['ips'][0]
# populate interface_info
interface_info['address_v6'] = ip['address']
interface_info['netmask_v6'] = subnet.as_netaddr().netmask
interface_info['gateway_v6'] = subnet['gateway']['address']
except IndexError:
# there isn't a v6 subnet or there are no ips
pass
interfaces_info.append(interface_info)
if interfaces_info:
net = str(template(template_data,
searchList=[{'interfaces': interfaces_info,
'use_ipv6': CONF.use_ipv6}]))
return key, net, metadata
def ensure_correct_host(session):
"""Ensure we're connected to the host we're running on. This is the
required configuration for anything that uses vdi_attached_here."""
this_vm_uuid = get_this_vm_uuid()
try:
session.call_xenapi('VM.get_by_uuid', this_vm_uuid)
except session.XenAPI.Failure as exc:
if exc.details[0] != 'UUID_INVALID':
raise
raise Exception(_('This domU must be running on the host '
'specified by xenapi_connection_url'))
def move_disks(session, instance, disk_info):
"""Move and possibly link VHDs via the XAPI plugin."""
imported_vhds = session.call_plugin_serialized(
'migration', 'move_vhds_into_sr', instance_uuid=instance['uuid'],
sr_path=get_sr_path(session), uuid_stack=_make_uuid_stack())
# Now we rescan the SR so we find the VHDs
scan_default_sr(session)
# Set name-label so we can find if we need to clean up a failed
# migration
root_uuid = imported_vhds['root']['uuid']
set_vdi_name(session, root_uuid, instance['name'], 'root')
root_vdi_ref = session.call_xenapi('VDI.get_by_uuid', root_uuid)
return {'uuid': root_uuid, 'ref': root_vdi_ref}
def vm_ref_or_raise(session, instance_name):
vm_ref = lookup(session, instance_name)
if vm_ref is None:
raise exception.InstanceNotFound(instance_id=instance_name)
return vm_ref
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