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connection.py
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connection.py
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Copyright (c) 2010 Citrix Systems, Inc.
# Copyright (c) 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.
"""
A connection to a hypervisor through libvirt.
Supports KVM, LXC, QEMU, UML, and XEN.
**Related Flags**
:libvirt_type: Libvirt domain type. Can be kvm, qemu, uml, xen
(default: kvm).
:libvirt_uri: Override for the default libvirt URI (depends on libvirt_type).
:libvirt_xml_template: Libvirt XML Template.
:rescue_image_id: Rescue ami image (None = original image).
:rescue_kernel_id: Rescue aki image (None = original image).
:rescue_ramdisk_id: Rescue ari image (None = original image).
:injected_network_template: Template file for injected network
:allow_same_net_traffic: Whether to allow in project network traffic
"""
import hashlib
import functools
import multiprocessing
import netaddr
import os
import random
import re
import shutil
import sys
import tempfile
import time
import uuid
from xml.dom import minidom
from xml.etree import ElementTree
from eventlet import greenthread
from eventlet import tpool
from nova import block_device
from nova import context as nova_context
from nova import db
from nova import exception
from nova import flags
import nova.image
from nova import log as logging
from nova import utils
from nova import vnc
from nova.auth import manager
from nova.compute import instance_types
from nova.compute import power_state
from nova.virt import disk
from nova.virt import driver
from nova.virt import images
from nova.virt.libvirt import netutils
libvirt = None
libxml2 = None
Template = None
LOG = logging.getLogger('nova.virt.libvirt_conn')
FLAGS = flags.FLAGS
flags.DECLARE('live_migration_retry_count', 'nova.compute.manager')
# TODO(vish): These flags should probably go into a shared location
flags.DEFINE_string('rescue_image_id', None, 'Rescue ami image')
flags.DEFINE_string('rescue_kernel_id', None, 'Rescue aki image')
flags.DEFINE_string('rescue_ramdisk_id', None, 'Rescue ari image')
flags.DEFINE_string('libvirt_xml_template',
utils.abspath('virt/libvirt.xml.template'),
'Libvirt XML Template')
flags.DEFINE_string('libvirt_type',
'kvm',
'Libvirt domain type (valid options are: '
'kvm, lxc, qemu, uml, xen)')
flags.DEFINE_string('libvirt_uri',
'',
'Override the default libvirt URI (which is dependent'
' on libvirt_type)')
flags.DEFINE_bool('allow_same_net_traffic',
True,
'Whether to allow network traffic from same network')
flags.DEFINE_bool('use_cow_images',
True,
'Whether to use cow images')
flags.DEFINE_string('ajaxterm_portrange',
'10000-12000',
'Range of ports that ajaxterm should randomly try to bind')
flags.DEFINE_string('firewall_driver',
'nova.virt.libvirt.firewall.IptablesFirewallDriver',
'Firewall driver (defaults to iptables)')
flags.DEFINE_string('cpuinfo_xml_template',
utils.abspath('virt/cpuinfo.xml.template'),
'CpuInfo XML Template (Used only live migration now)')
flags.DEFINE_string('live_migration_uri',
"qemu+tcp://%s/system",
'Define protocol used by live_migration feature')
flags.DEFINE_string('live_migration_flag',
"VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER",
'Define live migration behavior.')
flags.DEFINE_string('block_migration_flag',
"VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER, "
"VIR_MIGRATE_NON_SHARED_INC",
'Define block migration behavior.')
flags.DEFINE_integer('live_migration_bandwidth', 0,
'Define live migration behavior')
flags.DEFINE_string('snapshot_image_format', None,
'Snapshot image format (valid options are : '
'raw, qcow2, vmdk, vdi).'
'Defaults to same as source image')
flags.DEFINE_string('libvirt_vif_type', 'bridge',
'Type of VIF to create.')
flags.DEFINE_string('libvirt_vif_driver',
'nova.virt.libvirt.vif.LibvirtBridgeDriver',
'The libvirt VIF driver to configure the VIFs.')
flags.DEFINE_list('libvirt_volume_drivers',
['iscsi=nova.virt.libvirt.volume.LibvirtISCSIVolumeDriver',
'local=nova.virt.libvirt.volume.LibvirtVolumeDriver',
'rdb=nova.virt.libvirt.volume.LibvirtNetVolumeDriver',
'sheepdog=nova.virt.libvirt.volume.LibvirtNetVolumeDriver'],
'Libvirt handlers for remote volumes.')
flags.DEFINE_string('default_local_format',
None,
'The default format a local_volume will be formatted with '
'on creation.')
flags.DEFINE_bool('libvirt_use_virtio_for_bridges',
False,
'Use virtio for bridge interfaces')
def get_connection(read_only):
# These are loaded late so that there's no need to install these
# libraries when not using libvirt.
# Cheetah is separate because the unit tests want to load Cheetah,
# but not libvirt.
global libvirt
global libxml2
if libvirt is None:
libvirt = __import__('libvirt')
if libxml2 is None:
libxml2 = __import__('libxml2')
_late_load_cheetah()
return LibvirtConnection(read_only)
def _late_load_cheetah():
global Template
if Template is None:
t = __import__('Cheetah.Template', globals(), locals(),
['Template'], -1)
Template = t.Template
def _get_eph_disk(ephemeral):
return 'disk.eph' + str(ephemeral['num'])
class LibvirtConnection(driver.ComputeDriver):
def __init__(self, read_only):
super(LibvirtConnection, self).__init__()
self.libvirt_uri = self.get_uri()
self.libvirt_xml = open(FLAGS.libvirt_xml_template).read()
self.cpuinfo_xml = open(FLAGS.cpuinfo_xml_template).read()
self._wrapped_conn = None
self.read_only = read_only
fw_class = utils.import_class(FLAGS.firewall_driver)
self.firewall_driver = fw_class(get_connection=self._get_connection)
self.vif_driver = utils.import_object(FLAGS.libvirt_vif_driver)
self.volume_drivers = {}
for driver_str in FLAGS.libvirt_volume_drivers:
driver_type, _sep, driver = driver_str.partition('=')
driver_class = utils.import_class(driver)
self.volume_drivers[driver_type] = driver_class(self)
def init_host(self, host):
# NOTE(nsokolov): moved instance restarting to ComputeManager
pass
def _get_connection(self):
if not self._wrapped_conn or not self._test_connection():
LOG.debug(_('Connecting to libvirt: %s'), self.libvirt_uri)
self._wrapped_conn = self._connect(self.libvirt_uri,
self.read_only)
return self._wrapped_conn
_conn = property(_get_connection)
def _test_connection(self):
try:
self._wrapped_conn.getCapabilities()
return True
except libvirt.libvirtError as e:
if e.get_error_code() == libvirt.VIR_ERR_SYSTEM_ERROR and \
e.get_error_domain() == libvirt.VIR_FROM_REMOTE:
LOG.debug(_('Connection to libvirt broke'))
return False
raise
def get_uri(self):
if FLAGS.libvirt_type == 'uml':
uri = FLAGS.libvirt_uri or 'uml:///system'
elif FLAGS.libvirt_type == 'xen':
uri = FLAGS.libvirt_uri or 'xen:///'
elif FLAGS.libvirt_type == 'lxc':
uri = FLAGS.libvirt_uri or 'lxc:///'
else:
uri = FLAGS.libvirt_uri or 'qemu:///system'
return uri
def _connect(self, uri, read_only):
auth = [[libvirt.VIR_CRED_AUTHNAME, libvirt.VIR_CRED_NOECHOPROMPT],
'root',
None]
if read_only:
return libvirt.openReadOnly(uri)
else:
return libvirt.openAuth(uri, auth, 0)
def list_instances(self):
return [self._conn.lookupByID(x).name()
for x in self._conn.listDomainsID()]
def _map_to_instance_info(self, domain):
"""Gets info from a virsh domain object into an InstanceInfo"""
# domain.info() returns a list of:
# state: one of the state values (virDomainState)
# maxMemory: the maximum memory used by the domain
# memory: the current amount of memory used by the domain
# nbVirtCPU: the number of virtual CPU
# puTime: the time used by the domain in nanoseconds
(state, _max_mem, _mem, _num_cpu, _cpu_time) = domain.info()
name = domain.name()
return driver.InstanceInfo(name, state)
def list_instances_detail(self):
infos = []
for domain_id in self._conn.listDomainsID():
domain = self._conn.lookupByID(domain_id)
info = self._map_to_instance_info(domain)
infos.append(info)
return infos
def plug_vifs(self, instance, network_info):
"""Plugin VIFs into networks."""
for (network, mapping) in network_info:
self.vif_driver.plug(instance, network, mapping)
def destroy(self, instance, network_info, block_device_info=None,
cleanup=True):
instance_name = instance['name']
try:
virt_dom = self._lookup_by_name(instance_name)
except exception.NotFound:
virt_dom = None
# If the instance is already terminated, we're still happy
# Otherwise, destroy it
if virt_dom is not None:
try:
virt_dom.destroy()
except libvirt.libvirtError as e:
is_okay = False
errcode = e.get_error_code()
if errcode == libvirt.VIR_ERR_OPERATION_INVALID:
# If the instance if already shut off, we get this:
# Code=55 Error=Requested operation is not valid:
# domain is not running
(state, _max_mem, _mem, _cpus, _t) = virt_dom.info()
if state == power_state.SHUTOFF:
is_okay = True
if not is_okay:
LOG.warning(_("Error from libvirt during destroy of "
"%(instance_name)s. Code=%(errcode)s "
"Error=%(e)s") %
locals())
raise
try:
# NOTE(justinsb): We remove the domain definition. We probably
# would do better to keep it if cleanup=False (e.g. volumes?)
# (e.g. #2 - not losing machines on failure)
virt_dom.undefine()
except libvirt.libvirtError as e:
errcode = e.get_error_code()
LOG.warning(_("Error from libvirt during undefine of "
"%(instance_name)s. Code=%(errcode)s "
"Error=%(e)s") %
locals())
raise
for (network, mapping) in network_info:
self.vif_driver.unplug(instance, network, mapping)
def _wait_for_destroy():
"""Called at an interval until the VM is gone."""
instance_name = instance['name']
try:
state = self.get_info(instance_name)['state']
except exception.NotFound:
msg = _("Instance %s destroyed successfully.") % instance_name
LOG.info(msg)
raise utils.LoopingCallDone
timer = utils.LoopingCall(_wait_for_destroy)
timer.start(interval=0.5, now=True)
self.firewall_driver.unfilter_instance(instance,
network_info=network_info)
# NOTE(vish): we disconnect from volumes regardless
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
for vol in block_device_mapping:
connection_info = vol['connection_info']
mountpoint = vol['mount_device']
xml = self.volume_driver_method('disconnect_volume',
connection_info,
mountpoint)
if cleanup:
self._cleanup(instance)
return True
def _cleanup(self, instance):
target = os.path.join(FLAGS.instances_path, instance['name'])
instance_name = instance['name']
LOG.info(_('instance %(instance_name)s: deleting instance files'
' %(target)s') % locals())
if FLAGS.libvirt_type == 'lxc':
disk.destroy_container(target, instance, nbd=FLAGS.use_cow_images)
if os.path.exists(target):
shutil.rmtree(target)
def volume_driver_method(self, method_name, connection_info,
*args, **kwargs):
driver_type = connection_info.get('driver_volume_type')
if not driver_type in self.volume_drivers:
raise exception.VolumeDriverNotFound(driver_type=driver_type)
driver = self.volume_drivers[driver_type]
method = getattr(driver, method_name)
return method(connection_info, *args, **kwargs)
@exception.wrap_exception()
def attach_volume(self, connection_info, instance_name, mountpoint):
virt_dom = self._lookup_by_name(instance_name)
mount_device = mountpoint.rpartition("/")[2]
xml = self.volume_driver_method('connect_volume',
connection_info,
mount_device)
virt_dom.attachDevice(xml)
def _get_disk_xml(self, xml, device):
"""Returns the xml for the disk mounted at device"""
try:
doc = libxml2.parseDoc(xml)
except Exception:
return None
ctx = doc.xpathNewContext()
try:
ret = ctx.xpathEval('/domain/devices/disk')
for node in ret:
for child in node.children:
if child.name == 'target':
if child.prop('dev') == device:
return str(node)
finally:
if ctx is not None:
ctx.xpathFreeContext()
if doc is not None:
doc.freeDoc()
@exception.wrap_exception()
def detach_volume(self, connection_info, instance_name, mountpoint):
mount_device = mountpoint.rpartition("/")[2]
try:
# NOTE(vish): This is called to cleanup volumes after live
# migration, so we should still logout even if
# the instance doesn't exist here anymore.
virt_dom = self._lookup_by_name(instance_name)
xml = self._get_disk_xml(virt_dom.XMLDesc(0), mount_device)
if not xml:
raise exception.DiskNotFound(location=mount_device)
virt_dom.detachDevice(xml)
finally:
self.volume_driver_method('disconnect_volume',
connection_info,
mount_device)
@exception.wrap_exception()
def snapshot(self, context, instance, image_href):
"""Create snapshot from a running VM instance.
This command only works with qemu 0.14+
"""
virt_dom = self._lookup_by_name(instance['name'])
(image_service, image_id) = nova.image.get_image_service(
context, instance['image_ref'])
base = image_service.show(context, image_id)
(snapshot_image_service, snapshot_image_id) = \
nova.image.get_image_service(context, image_href)
snapshot = snapshot_image_service.show(context, snapshot_image_id)
metadata = {'is_public': False,
'status': 'active',
'name': snapshot['name'],
'properties': {
'kernel_id': instance['kernel_id'],
'image_location': 'snapshot',
'image_state': 'available',
'owner_id': instance['project_id'],
'ramdisk_id': instance['ramdisk_id'],
}
}
if 'architecture' in base['properties']:
arch = base['properties']['architecture']
metadata['properties']['architecture'] = arch
source_format = base.get('disk_format') or 'raw'
if source_format == 'ami':
# NOTE(vish): assume amis are raw
source_format = 'raw'
image_format = FLAGS.snapshot_image_format or source_format
if FLAGS.use_cow_images:
source_format = 'qcow2'
# NOTE(vish): glance forces ami disk format to be ami
if base.get('disk_format') == 'ami':
metadata['disk_format'] = 'ami'
else:
metadata['disk_format'] = image_format
if 'container_format' in base:
metadata['container_format'] = base['container_format']
# Make the snapshot
snapshot_name = uuid.uuid4().hex
snapshot_xml = """
<domainsnapshot>
<name>%s</name>
</domainsnapshot>
""" % snapshot_name
snapshot_ptr = virt_dom.snapshotCreateXML(snapshot_xml, 0)
# Find the disk
xml_desc = virt_dom.XMLDesc(0)
domain = ElementTree.fromstring(xml_desc)
source = domain.find('devices/disk/source')
disk_path = source.get('file')
# Export the snapshot to a raw image
temp_dir = tempfile.mkdtemp()
try:
out_path = os.path.join(temp_dir, snapshot_name)
qemu_img_cmd = ('qemu-img',
'convert',
'-f',
source_format,
'-O',
image_format,
'-s',
snapshot_name,
disk_path,
out_path)
utils.execute(*qemu_img_cmd)
# Upload that image to the image service
with open(out_path) as image_file:
image_service.update(context,
image_href,
metadata,
image_file)
finally:
# Clean up
shutil.rmtree(temp_dir)
snapshot_ptr.delete(0)
@exception.wrap_exception()
def reboot(self, instance, network_info, reboot_type=None, xml=None):
"""Reboot a virtual machine, given an instance reference.
This method actually destroys and re-creates the domain to ensure the
reboot happens, as the guest OS cannot ignore this action.
"""
virt_dom = self._conn.lookupByName(instance['name'])
# NOTE(itoumsn): Use XML delived from the running instance
# instead of using to_xml(instance, network_info). This is almost
# the ultimate stupid workaround.
if not xml:
xml = virt_dom.XMLDesc(0)
# NOTE(itoumsn): self.shutdown() and wait instead of self.destroy() is
# better because we cannot ensure flushing dirty buffers
# in the guest OS. But, in case of KVM, shutdown() does not work...
self.destroy(instance, network_info, cleanup=False)
self.plug_vifs(instance, network_info)
self.firewall_driver.setup_basic_filtering(instance, network_info)
self.firewall_driver.prepare_instance_filter(instance, network_info)
self._create_new_domain(xml)
self.firewall_driver.apply_instance_filter(instance, network_info)
def _wait_for_reboot():
"""Called at an interval until the VM is running again."""
instance_name = instance['name']
try:
state = self.get_info(instance_name)['state']
except exception.NotFound:
msg = _("During reboot, %s disappeared.") % instance_name
LOG.error(msg)
raise utils.LoopingCallDone
if state == power_state.RUNNING:
msg = _("Instance %s rebooted successfully.") % instance_name
LOG.info(msg)
raise utils.LoopingCallDone
timer = utils.LoopingCall(_wait_for_reboot)
return timer.start(interval=0.5, now=True)
@exception.wrap_exception()
def pause(self, instance, callback):
"""Pause VM instance"""
dom = self._lookup_by_name(instance.name)
dom.suspend()
@exception.wrap_exception()
def unpause(self, instance, callback):
"""Unpause paused VM instance"""
dom = self._lookup_by_name(instance.name)
dom.resume()
@exception.wrap_exception()
def suspend(self, instance, callback):
"""Suspend the specified instance"""
dom = self._lookup_by_name(instance.name)
dom.managedSave(0)
@exception.wrap_exception()
def resume(self, instance, callback):
"""resume the specified instance"""
dom = self._lookup_by_name(instance.name)
dom.create()
@exception.wrap_exception()
def rescue(self, context, instance, callback, network_info):
"""Loads a VM using rescue images.
A rescue is normally performed when something goes wrong with the
primary images and data needs to be corrected/recovered. Rescuing
should not edit or over-ride the original image, only allow for
data recovery.
"""
virt_dom = self._conn.lookupByName(instance['name'])
unrescue_xml = virt_dom.XMLDesc(0)
unrescue_xml_path = os.path.join(FLAGS.instances_path,
instance['name'],
'unrescue.xml')
f = open(unrescue_xml_path, 'w')
f.write(unrescue_xml)
f.close()
xml = self.to_xml(instance, network_info, rescue=True)
rescue_images = {
'image_id': FLAGS.rescue_image_id or instance['image_ref'],
'kernel_id': FLAGS.rescue_kernel_id or instance['kernel_id'],
'ramdisk_id': FLAGS.rescue_ramdisk_id or instance['ramdisk_id'],
}
self._create_image(context, instance, xml, '.rescue', rescue_images,
network_info=network_info)
self.reboot(instance, network_info, xml=xml)
@exception.wrap_exception()
def unrescue(self, instance, callback, network_info):
"""Reboot the VM which is being rescued back into primary images.
Because reboot destroys and re-creates instances, unresue should
simply call reboot.
"""
unrescue_xml_path = os.path.join(FLAGS.instances_path,
instance['name'],
'unrescue.xml')
f = open(unrescue_xml_path)
unrescue_xml = f.read()
f.close()
os.remove(unrescue_xml_path)
self.reboot(instance, network_info, xml=unrescue_xml)
@exception.wrap_exception()
def poll_rescued_instances(self, timeout):
pass
@exception.wrap_exception()
def poll_unconfirmed_resizes(self, resize_confirm_window):
pass
# NOTE(ilyaalekseyev): Implementation like in multinics
# for xenapi(tr3buchet)
@exception.wrap_exception()
def spawn(self, context, instance, network_info,
block_device_info=None):
xml = self.to_xml(instance, network_info, False,
block_device_info=block_device_info)
self.firewall_driver.setup_basic_filtering(instance, network_info)
self.firewall_driver.prepare_instance_filter(instance, network_info)
self._create_image(context, instance, xml, network_info=network_info,
block_device_info=block_device_info)
domain = self._create_new_domain(xml)
LOG.debug(_("instance %s: is running"), instance['name'])
self.firewall_driver.apply_instance_filter(instance, network_info)
def _wait_for_boot():
"""Called at an interval until the VM is running."""
instance_name = instance['name']
try:
state = self.get_info(instance_name)['state']
except exception.NotFound:
msg = _("During reboot, %s disappeared.") % instance_name
LOG.error(msg)
raise utils.LoopingCallDone
if state == power_state.RUNNING:
msg = _("Instance %s spawned successfully.") % instance_name
LOG.info(msg)
raise utils.LoopingCallDone
timer = utils.LoopingCall(_wait_for_boot)
return timer.start(interval=0.5, now=True)
def _flush_xen_console(self, virsh_output):
LOG.info(_('virsh said: %r'), virsh_output)
virsh_output = virsh_output[0].strip()
if virsh_output.startswith('/dev/'):
LOG.info(_("cool, it's a device"))
out, err = utils.execute('dd',
"if=%s" % virsh_output,
'iflag=nonblock',
run_as_root=True,
check_exit_code=False)
return out
else:
return ''
def _append_to_file(self, data, fpath):
LOG.info(_('data: %(data)r, fpath: %(fpath)r') % locals())
fp = open(fpath, 'a+')
fp.write(data)
return fpath
def _dump_file(self, fpath):
fp = open(fpath, 'r+')
contents = fp.read()
LOG.info(_('Contents of file %(fpath)s: %(contents)r') % locals())
return contents
@exception.wrap_exception()
def get_console_output(self, instance):
console_log = os.path.join(FLAGS.instances_path, instance['name'],
'console.log')
utils.execute('chown', os.getuid(), console_log, run_as_root=True)
if FLAGS.libvirt_type == 'xen':
# Xen is special
virsh_output = utils.execute('virsh', 'ttyconsole',
instance['name'])
data = self._flush_xen_console(virsh_output)
fpath = self._append_to_file(data, console_log)
elif FLAGS.libvirt_type == 'lxc':
# LXC is also special
LOG.info(_("Unable to read LXC console"))
else:
fpath = console_log
return self._dump_file(fpath)
@exception.wrap_exception()
def get_ajax_console(self, instance):
def get_open_port():
start_port, end_port = FLAGS.ajaxterm_portrange.split("-")
for i in xrange(0, 100): # don't loop forever
port = random.randint(int(start_port), int(end_port))
# netcat will exit with 0 only if the port is in use,
# so a nonzero return value implies it is unused
cmd = 'netcat', '0.0.0.0', port, '-w', '1'
try:
stdout, stderr = utils.execute(*cmd, process_input='')
except exception.ProcessExecutionError:
return port
raise Exception(_('Unable to find an open port'))
def get_pty_for_instance(instance_name):
virt_dom = self._lookup_by_name(instance_name)
xml = virt_dom.XMLDesc(0)
dom = minidom.parseString(xml)
for serial in dom.getElementsByTagName('serial'):
if serial.getAttribute('type') == 'pty':
source = serial.getElementsByTagName('source')[0]
return source.getAttribute('path')
port = get_open_port()
token = str(uuid.uuid4())
host = instance['host']
ajaxterm_cmd = 'sudo socat - %s' \
% get_pty_for_instance(instance['name'])
cmd = ['%s/tools/ajaxterm/ajaxterm.py' % utils.novadir(),
'--command', ajaxterm_cmd, '-t', token, '-p', port]
utils.execute(cmd)
return {'token': token, 'host': host, 'port': port}
def get_host_ip_addr(self):
return FLAGS.my_ip
@exception.wrap_exception()
def get_vnc_console(self, instance):
def get_vnc_port_for_instance(instance_name):
virt_dom = self._lookup_by_name(instance_name)
xml = virt_dom.XMLDesc(0)
# TODO: use etree instead of minidom
dom = minidom.parseString(xml)
for graphic in dom.getElementsByTagName('graphics'):
if graphic.getAttribute('type') == 'vnc':
return graphic.getAttribute('port')
port = get_vnc_port_for_instance(instance['name'])
token = str(uuid.uuid4())
host = instance['host']
return {'token': token, 'host': host, 'port': port}
@staticmethod
def _cache_image(fn, target, fname, cow=False, *args, **kwargs):
"""Wrapper for a method that creates an image that caches the image.
This wrapper will save the image into a common store and create a
copy for use by the hypervisor.
The underlying method should specify a kwarg of target representing
where the image will be saved.
fname is used as the filename of the base image. The filename needs
to be unique to a given image.
If cow is True, it will make a CoW image instead of a copy.
"""
if not os.path.exists(target):
base_dir = os.path.join(FLAGS.instances_path, '_base')
if not os.path.exists(base_dir):
os.mkdir(base_dir)
base = os.path.join(base_dir, fname)
@utils.synchronized(fname)
def call_if_not_exists(base, fn, *args, **kwargs):
if not os.path.exists(base):
fn(target=base, *args, **kwargs)
call_if_not_exists(base, fn, *args, **kwargs)
if cow:
utils.execute('qemu-img', 'create', '-f', 'qcow2', '-o',
'cluster_size=2M,backing_file=%s' % base,
target)
else:
utils.execute('cp', base, target)
def _fetch_image(self, context, target, image_id, user_id, project_id,
size=None):
"""Grab image and optionally attempt to resize it"""
images.fetch_to_raw(context, image_id, target, user_id, project_id)
if size:
disk.extend(target, size)
def _create_local(self, target, local_size, unit='G', fs_format=None):
"""Create a blank image of specified size"""
if not fs_format:
fs_format = FLAGS.default_local_format
utils.execute('truncate', target, '-s', "%d%c" % (local_size, unit))
if fs_format:
utils.execute('mkfs', '-t', fs_format, target)
def _create_ephemeral(self, target, local_size, fs_label, os_type):
self._create_local(target, local_size)
disk.mkfs(os_type, fs_label, target)
def _create_swap(self, target, swap_mb):
"""Create a swap file of specified size"""
self._create_local(target, swap_mb, unit='M')
utils.execute('mkswap', target)
def _create_image(self, context, inst, libvirt_xml, suffix='',
disk_images=None, network_info=None,
block_device_info=None):
if not suffix:
suffix = ''
# syntactic nicety
def basepath(fname='', suffix=suffix):
return os.path.join(FLAGS.instances_path,
inst['name'],
fname + suffix)
# ensure directories exist and are writable
utils.execute('mkdir', '-p', basepath(suffix=''))
LOG.info(_('instance %s: Creating image'), inst['name'])
f = open(basepath('libvirt.xml'), 'w')
f.write(libvirt_xml)
f.close()
if FLAGS.libvirt_type == 'lxc':
container_dir = '%s/rootfs' % basepath(suffix='')
utils.execute('mkdir', '-p', container_dir)
# NOTE(vish): No need add the suffix to console.log
console_log = basepath('console.log', '')
if os.path.exists(console_log):
utils.execute('chown', os.getuid(), console_log, run_as_root=True)
os.close(os.open(console_log, os.O_CREAT | os.O_WRONLY, 0660))
if not disk_images:
disk_images = {'image_id': inst['image_ref'],
'kernel_id': inst['kernel_id'],
'ramdisk_id': inst['ramdisk_id']}
if disk_images['kernel_id']:
fname = '%08x' % int(disk_images['kernel_id'])
self._cache_image(fn=self._fetch_image,
context=context,
target=basepath('kernel'),
fname=fname,
image_id=disk_images['kernel_id'],
user_id=inst['user_id'],
project_id=inst['project_id'])
if disk_images['ramdisk_id']:
fname = '%08x' % int(disk_images['ramdisk_id'])
self._cache_image(fn=self._fetch_image,
context=context,
target=basepath('ramdisk'),
fname=fname,
image_id=disk_images['ramdisk_id'],
user_id=inst['user_id'],
project_id=inst['project_id'])
root_fname = hashlib.sha1(disk_images['image_id']).hexdigest()
size = FLAGS.minimum_root_size
inst_type_id = inst['instance_type_id']
inst_type = instance_types.get_instance_type(inst_type_id)
if inst_type['name'] == 'm1.tiny' or suffix == '.rescue':
size = None
root_fname += "_sm"
if not self._volume_in_mapping(self.default_root_device,
block_device_info):
self._cache_image(fn=self._fetch_image,
context=context,
target=basepath('disk'),
fname=root_fname,
cow=FLAGS.use_cow_images,
image_id=disk_images['image_id'],
user_id=inst['user_id'],
project_id=inst['project_id'],
size=size)
local_gb = inst['local_gb']
if local_gb and not self._volume_in_mapping(
self.default_local_device, block_device_info):
fn = functools.partial(self._create_ephemeral,
fs_label='ephemeral0',
os_type=inst.os_type)
self._cache_image(fn=fn,
target=basepath('disk.local'),
fname="ephemeral_%s_%s_%s" %
("0", local_gb, inst.os_type),
cow=FLAGS.use_cow_images,
local_size=local_gb)
for eph in driver.block_device_info_get_ephemerals(block_device_info):
fn = functools.partial(self._create_ephemeral,
fs_label='ephemeral%d' % eph['num'],
os_type=inst.os_type)
self._cache_image(fn=fn,
target=basepath(_get_eph_disk(eph)),
fname="ephemeral_%s_%s_%s" %
(eph['num'], eph['size'], inst.os_type),
cow=FLAGS.use_cow_images,
local_size=eph['size'])
swap_mb = 0
swap = driver.block_device_info_get_swap(block_device_info)
if driver.swap_is_usable(swap):
swap_mb = swap['swap_size']
elif (inst_type['swap'] > 0 and
not self._volume_in_mapping(self.default_swap_device,
block_device_info)):
swap_mb = inst_type['swap']
if swap_mb > 0:
self._cache_image(fn=self._create_swap,
target=basepath('disk.swap'),
fname="swap_%s" % swap_mb,
cow=FLAGS.use_cow_images,
swap_mb=swap_mb)
# For now, we assume that if we're not using a kernel, we're using a
# partitioned disk image where the target partition is the first
# partition
target_partition = None
if not inst['kernel_id']:
target_partition = "1"
config_drive_id = inst.get('config_drive_id')
config_drive = inst.get('config_drive')
if any((FLAGS.libvirt_type == 'lxc', config_drive, config_drive_id)):
target_partition = None
if config_drive_id:
fname = '%08x' % int(config_drive_id)
self._cache_image(fn=self._fetch_image,
target=basepath('disk.config'),
fname=fname,
image_id=config_drive_id,
user_id=inst['user_id'],
project_id=inst['project_id'],)
elif config_drive:
self._create_local(basepath('disk.config'), 64, unit='M',
fs_format='msdos') # 64MB
if inst['key_data']:
key = str(inst['key_data'])
else:
key = None
net = None
nets = []
ifc_template = open(FLAGS.injected_network_template).read()
ifc_num = -1
have_injected_networks = False
admin_context = nova_context.get_admin_context()
for (network_ref, mapping) in network_info:
ifc_num += 1
if not network_ref['injected']:
continue
have_injected_networks = True
address = mapping['ips'][0]['ip']
netmask = mapping['ips'][0]['netmask']
address_v6 = None
gateway_v6 = None
netmask_v6 = None
if FLAGS.use_ipv6:
address_v6 = mapping['ip6s'][0]['ip']