OpenStack Liberty版本，這裏簡單記錄下nova boot from volume的代碼調用過程。
nova boot from volume命令行
nova client
novaclient/v2/shell.py # novaclient端發起請求
def do_boot(cs, args):
"""Boot a new server."""
boot_args, boot_kwargs = _boot(cs, args)
extra_boot_kwargs = utils.get_resource_manager_extra_kwargs(do_boot, args)
boot_kwargs.update(extra_boot_kwargs)
server = cs.servers.create(*boot_args, **boot_kwargs) # 跳轉到novaclient/v2/servers.py
_print_server(cs, args, server)
if args.poll:
_poll_for_status(cs.servers.get, server.id, 'building', ['active'])
novaclient/v2/servers.py
def create(self, name, image, flavor, meta=None, files=None,
reservation_id=None, min_count=None,
max_count=None, security_groups=None, userdata=None,
key_name=None, availability_zone=None,
block_device_mapping=None, block_device_mapping_v2=None,
nics=None, scheduler_hints=None,
config_drive=None, disk_config=None, admin_pass=None,
access_ip_v4=None, access_ip_v6=None, **kwargs):
if not min_count:
min_count = 1
if not max_count:
max_count = min_count
if min_count > max_count:
min_count = max_count
boot_args = [name, image, flavor]
descr_microversion = api_versions.APIVersion("2.19")
if "description" in kwargs and self.api_version < descr_microversion:
raise exceptions.UnsupportedAttribute("description", "2.19")
boot_kwargs = dict(
meta=meta, files=files, userdata=userdata,
reservation_id=reservation_id, min_count=min_count,
max_count=max_count, security_groups=security_groups,
key_name=key_name, availability_zone=availability_zone,
scheduler_hints=scheduler_hints, config_drive=config_drive,
disk_config=disk_config, admin_pass=admin_pass,
access_ip_v4=access_ip_v4, access_ip_v6=access_ip_v6, **kwargs)
if block_device_mapping:
resource_url = "/os-volumes_boot"
boot_kwargs['block_device_mapping'] = block_device_mapping
elif block_device_mapping_v2: # 默認使用block_device_mapping_v2
resource_url = "/os-volumes_boot" # os-volumes_boot路徑
boot_kwargs['block_device_mapping_v2'] = block_device_mapping_v2
else:
resource_url = "/servers"
if nics:
boot_kwargs['nics'] = nics
response_key = "server"
return self._boot(resource_url, response_key, *boot_args,
**boot_kwargs) # client封裝resetful api請求nova server
nova/api/openstack/compute/volumes.py
class Volumes(extensions.V21APIExtensionBase)
def get_resources(self):
resources = []
res = extensions.ResourceExtension(
ALIAS, VolumeController(), collection_actions={'detail': 'GET'})
resources.append(res)
res = extensions.ResourceExtension('os-volumes_boot', # 對應os-volumes_boot路徑
inherits='servers') # 這裏應該是從servers路徑繼承的意思
resources.append(res)
nova/api/openstack/compute/servers.py
class Servers(extensions.V21APIExtensionBase):
"""Servers."""
name = "Servers"
alias = ALIAS # 這裏ALIAS=servers
version = 1
def get_resources(self):
member_actions = {'action': 'POST'}
collection_actions = {'detail': 'GET'}
resources = [
extensions.ResourceExtension(
ALIAS,
ServersController(extension_info=self.extension_info), # ServersController類
member_name='server', collection_actions=collection_actions,
member_actions=member_actions)]
return resources
# ServersController類
class ServersController(wsgi.Controller):
@wsgi.response(202)
@extensions.expected_errors((400, 403, 409, 413))
@validation.schema(schema_server_create_v20, '2.0', '2.0')
@validation.schema(schema_server_create, '2.1', '2.18')
@validation.schema(schema_server_create_v219, '2.19')
def create(self, req, body):
"""Creates a new server for a given user."""
......
(instances, resv_id) = self.compute_api.create(context, # 跳轉到nova/compute/api.py
inst_type,
image_uuid,
display_name=name,
display_description=description,
availability_zone=availability_zone,
forced_host=host, forced_node=node,
metadata=server_dict.get('metadata', {}),
admin_password=password,
requested_networks=requested_networks,
check_server_group_quota=True,
**create_kwargs)
nova/compute/api.py
@hooks.add_hook("create_instance")
def create(self, context, instance_type,
image_href, kernel_id=None, ramdisk_id=None,
min_count=None, max_count=None,
display_name=None, display_description=None,
key_name=None, key_data=None, security_group=None,
availability_zone=None, forced_host=None, forced_node=None,
user_data=None, metadata=None, injected_files=None,
admin_password=None, block_device_mapping=None,
access_ip_v4=None, access_ip_v6=None, requested_networks=None,
config_drive=None, auto_disk_config=None, scheduler_hints=None,
legacy_bdm=True, shutdown_terminate=False,
check_server_group_quota=False):
return self._create_instance( # _create_instance function
context, instance_type,
image_href, kernel_id, ramdisk_id,
min_count, max_count,
display_name, display_description,
key_name, key_data, security_group,
availability_zone, user_data, metadata,
injected_files, admin_password,
access_ip_v4, access_ip_v6,
requested_networks, config_drive,
block_device_mapping, auto_disk_config,
filter_properties=filter_properties,
legacy_bdm=legacy_bdm,
shutdown_terminate=shutdown_terminate,
check_server_group_quota=check_server_group_quota)
def _create_instance(self, context, instance_type,
image_href, kernel_id, ramdisk_id,
min_count, max_count,
display_name, display_description,
key_name, key_data, security_groups,
availability_zone, user_data, metadata, injected_files,
admin_password, access_ip_v4, access_ip_v6,
requested_networks, config_drive,
block_device_mapping, auto_disk_config, filter_properties,
reservation_id=None, legacy_bdm=True, shutdown_terminate=False,
check_server_group_quota=False):
"""Verify all the input parameters regardless of the provisioning
strategy being performed and schedule the instance(s) for
creation.
"""
instances = self._provision_instances(context, instance_type,
min_count, max_count, base_options, boot_meta, security_groups,
block_device_mapping, shutdown_terminate,
instance_group, check_server_group_quota, filter_properties)
for instance in instances:
self._record_action_start(context, instance,
instance_actions.CREATE)
self.compute_task_api.build_instances(context, # 接下來會調用到conductor
instances=instances, image=boot_meta,
filter_properties=filter_properties,
admin_password=admin_password,
injected_files=injected_files,
requested_networks=requested_networks,
security_groups=security_groups,
block_device_mapping=block_device_mapping,
legacy_bdm=False)
nova/conductor/api.py
class ComputeTaskAPI(object):
def build_instances(self, context, instances, image, filter_properties,
admin_password, injected_files, requested_networks,
security_groups, block_device_mapping, legacy_bdm=True):
self.conductor_compute_rpcapi.build_instances(context,
instances=instances, image=image,
filter_properties=filter_properties,
admin_password=admin_password, injected_files=injected_files,
requested_networks=requested_networks,
security_groups=security_groups,
block_device_mapping=block_device_mapping,
legacy_bdm=legacy_bdm)
# rpc操作
nova/conductor/rpcapi.py
class ComputeTaskAPI(object):
def build_instances(self, context, instances, image, filter_properties,
admin_password, injected_files, requested_networks,
security_groups, block_device_mapping, legacy_bdm=True):
image_p = jsonutils.to_primitive(image)
version = '1.10'
if not self.client.can_send_version(version):
version = '1.9'
if 'instance_type' in filter_properties:
flavor = filter_properties['instance_type']
flavor_p = objects_base.obj_to_primitive(flavor)
filter_properties = dict(filter_properties,
instance_type=flavor_p)
kw = {'instances': instances, 'image': image_p,
'filter_properties': filter_properties,
'admin_password': admin_password,
'injected_files': injected_files,
'requested_networks': requested_networks,
'security_groups': security_groups}
if not self.client.can_send_version(version):
version = '1.8'
kw['requested_networks'] = kw['requested_networks'].as_tuples()
if not self.client.can_send_version('1.7'):
version = '1.5'
bdm_p = objects_base.obj_to_primitive(block_device_mapping)
kw.update({'block_device_mapping': bdm_p,
'legacy_bdm': legacy_bdm})
cctxt = self.client.prepare(version=version)
cctxt.cast(context, 'build_instances', **kw)
nova/conductor/api.py(223)build_instances()
nova/conductor/manager.py
class ComputeTaskManager(base.Base):
def build_instances():
self.compute_rpcapi.build_and_run_instance(context,
instance=instance, host=host['host'], image=image,
request_spec=request_spec,
filter_properties=local_filter_props,
admin_password=admin_password,
injected_files=injected_files,
requested_networks=requested_networks,
security_groups=security_groups,
block_device_mapping=bdms, node=host['nodename'],
limits=host['limits'])
nova/compute/rpcapi.py
class ComputeAPI(object):
def build_and_run_instance(self, ctxt, instance, host, image, request_spec,
filter_properties, admin_password=None, injected_files=None,
requested_networks=None, security_groups=None,
block_device_mapping=None, node=None, limits=None):
version = '4.0'
cctxt = self.client.prepare(server=host, version=version)
cctxt.cast(ctxt, 'build_and_run_instance', instance=instance,
image=image, request_spec=request_spec,
filter_properties=filter_properties,
admin_password=admin_password,
injected_files=injected_files,
requested_networks=requested_networks,
security_groups=security_groups,
block_device_mapping=block_device_mapping, node=node,
limits=limits)
nova/compute/manager.py
class ComputeManager(manager.Manager):
@wrap_exception()
@reverts_task_state
@wrap_instance_fault
def build_and_run_instance(self, context, instance, image, request_spec,
filter_properties, admin_password=None,
injected_files=None, requested_networks=None,
security_groups=None, block_device_mapping=None,
node=None, limits=None):
@utils.synchronized(instance.uuid)
def _locked_do_build_and_run_instance(*args, **kwargs):
# NOTE(danms): We grab the semaphore with the instance uuid
# locked because we could wait in line to build this instance
# for a while and we want to make sure that nothing else tries
# to do anything with this instance while we wait.
with self._build_semaphore:
self._do_build_and_run_instance(*args, **kwargs)
# NOTE(danms): We spawn here to return the RPC worker thread back to
# the pool. Since what follows could take a really long time, we don't
# want to tie up RPC workers.
utils.spawn_n(_locked_do_build_and_run_instance,
context, instance, image, request_spec,
filter_properties, admin_password, injected_files,
requested_networks, security_groups,
block_device_mapping, node, limits)
@hooks.add_hook('build_instance')
@wrap_exception()
@reverts_task_state
@wrap_instance_event
@wrap_instance_fault
def _do_build_and_run_instance(self, context, instance, image,
request_spec, filter_properties, admin_password, injected_files,
requested_networks, security_groups, block_device_mapping,
node=None, limits=None):
try:
LOG.debug('Starting instance...', context=context,
instance=instance)
instance.vm_state = vm_states.BUILDING
instance.task_state = None
instance.save(expected_task_state=
(task_states.SCHEDULING, None))
try:
with timeutils.StopWatch() as timer:
self._build_and_run_instance(context, instance, image,
decoded_files, admin_password, requested_networks,
security_groups, block_device_mapping, node, limits,
filter_properties)
LOG.info(_LI('Took %0.2f seconds to build instance.'),
timer.elapsed(), instance=instance)
return build_results.ACTIVE
def _build_and_run_instance(self, context, instance, image, injected_files,
admin_password, requested_networks, security_groups,
block_device_mapping, node, limits, filter_properties):
with self._build_resources(context, instance,
requested_networks, security_groups, image_meta,
block_device_mapping) as resources:
instance.vm_state = vm_states.BUILDING
instance.task_state = task_states.SPAWNING
# NOTE(JoshNang) This also saves the changes to the
# instance from _allocate_network_async, as they aren't
# saved in that function to prevent races.
instance.save(expected_task_state=
task_states.BLOCK_DEVICE_MAPPING)
block_device_info = resources['block_device_info']
network_info = resources['network_info']
LOG.debug('Start spawning the instance on the hypervisor.',
instance=instance)
with timeutils.StopWatch() as timer:
self.driver.spawn(context, instance, image_meta, # 這裏的driver用的是libvirt
injected_files, admin_password,
network_info=network_info,
block_device_info=block_device_info)
LOG.info(_LI('Took %0.2f seconds to spawn the instance on '
'the hypervisor.'), timer.elapsed(),
instance=instance)
# 創建雲盤的操作在這裏，這裏有個問題，創建雲盤的時候不能指定雲盤類型
_build_resources -> _prep_block_device -> class DriverImageBlockDevice(attach) -> volume_api.create
nova/virt/libvirt/driver.py
class LibvirtDriver(driver.ComputeDriver):
def spawn(self, context, instance, image_meta, injected_files,
admin_password, network_info=None, block_device_info=None):
disk_info = blockinfo.get_disk_info(CONF.libvirt.virt_type,
instance,
image_meta,
block_device_info)
self._create_image(context, instance, # 拉取image
disk_info['mapping'],
network_info=network_info,
block_device_info=block_device_info,
files=injected_files,
admin_pass=admin_password)
xml = self._get_guest_xml(context, instance, network_info, # 創建libvirt xml文件
disk_info, image_meta,
block_device_info=block_device_info,
write_to_disk=True)
self._create_domain_and_network(context, xml, instance, network_info, # 創建libvirt domain、network
disk_info,
block_device_info=block_device_info)
LOG.debug("Instance is running", instance=instance)
def _wait_for_boot():
"""Called at an interval until the VM is running."""
state = self.get_info(instance).state
if state == power_state.RUNNING:
LOG.info(_LI("Instance spawned successfully."),
instance=instance)
raise loopingcall.LoopingCallDone()
timer = loopingcall.FixedIntervalLoopingCall(_wait_for_boot)
timer.start(interval=0.5).wait()
nova/utils.py
def spawn_n(func, *args, **kwargs):
"""Passthrough method for eventlet.spawn_n.
This utility exists so that it can be stubbed for testing without
interfering with the service spawns.
It will also grab the context from the threadlocal store and add it to
the store on the new thread. This allows for continuity in logging the
context when using this method to spawn a new thread.
"""
_context = common_context.get_current()
@functools.wraps(func)
def context_wrapper(*args, **kwargs):
# NOTE: If update_store is not called after spawn_n it won't be
# available for the logger to pull from threadlocal storage.
if _context is not None:
_context.update_store()
func(*args, **kwargs)
eventlet.spawn_n(context_wrapper, *args, **kwargs) # 利用到eventlet併發的性能nova boot from volume注入密碼不成功，注入密碼實際上是對image操作，但是boot from volume的時候，
image和disk是在一起的，紅框中一旦檢測不到image，就直接return了
以上都是本人pdb總結的，有什麼不足之處，歡迎指正。