1. nova-api接收到request

在/etc/nova/api-paste.ini中，是这样配置nova v2的

[app:osapi_compute_app_v2]
paste.app_factory = nova.api.openstack.compute:APIRouter.factory

在/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/__init__.py中

class APIRouter(nova.api.openstack.APIRouter):中的

from nova.api.openstack.compute import servers
def _setup_routes(self, mapper, ext_mgr, init_only):
    ……
    self.resources['servers'] = servers.create_resource(ext_mgr)
    mapper.resource("server", "servers",
                controller=self.resources['servers'],
                collection={'detail': 'GET'},
                member={'action': 'POST'})

    ……

对于发送给/servers的POST的请求，是发给controller的。

在/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/servers.py中有下面的函数

def create_resource(ext_mgr):
    return wsgi.Resource(Controller(ext_mgr))

class Controller(wsgi.Controller):
    @wsgi.response(202)
    @wsgi.serializers(xml=FullServerTemplate)
    @wsgi.deserializers(xml=CreateDeserializer)
    def create(self, req, body):
        ……

接收到的request的格式如下：

{"server": {"name": "world", "imageRef": "6a1489cb-5905-4f97-ae8b-012770818213", "availability_zone": "nova", "key_name": "153key", "flavorRef": "2", "OS-DCF:diskConfig": "AUTO", "max_count": 1, "min_count": 1, "networks": [{"uuid": "a29561e9-2f32-4765-a0f8-306b870f780b"}], "security_groups": [{"name": "default"}]}}

然后开始解析这个request，得到

  • password: 如果request中有的解析出，没有则随机generate一个
  • name
  • image_uuid
  • personality： 从中得到config_drive或者injected_files
  • security_groups
  • requested_networks
  • flavor_id
  • key_name
  • user_data
  • availability_zone
  • block_device_mapping
  • min_count
  • max_count
  • auto_disk_config：是否自动配置硬盘到flavor指定的大小，OS-DCF，auto_disk_config
  • scheduler_hints：为scheduler提供参数

最终调用

(instances, resv_id) = self.compute_api.create(context,
                inst_type,
                image_uuid,
                display_name=name,
                display_description=name,
                key_name=key_name,
                metadata=server_dict.get('metadata', {}),
                access_ip_v4=access_ip_v4,
                access_ip_v6=access_ip_v6,
                injected_files=injected_files,
                admin_password=password,
                min_count=min_count,
                max_count=max_count,
                requested_networks=requested_networks,
                security_group=sg_names,
                user_data=user_data,
                availability_zone=availability_zone,
                config_drive=config_drive,
                block_device_mapping=block_device_mapping,
                auto_disk_config=auto_disk_config,
                scheduler_hints=scheduler_hints,
                legacy_bdm=legacy_bdm)

这一调用调用到/usr/lib/python2.7/dist-packages/nova/compute/api.py中

class API(base.Base):

@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, 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):
         ……
         return self._create_instance(
                       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,
                       scheduler_hints=scheduler_hints,
                       legacy_bdm=legacy_bdm)

API的_create_instance的函数

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,
           reservation_id=None, scheduler_hints=None,
           legacy_bdm=True):

  • _check_and_transform_bdm
  • _provision_instances：在数据库中创建instance对象create_db_entry_for_new_instance，将状态设为vm_states.BUILDING
  • _build_filter_properties：从scheduler_hints中得到filter_properties['instance_type']，filter_properties['force_hosts']，filter_properties['force_nodes']
  • _update_instance_group：从scheduler_hints得到'group'，将instance加入group
  • _record_action_start:instance_actions.CREATE
  • self.compute_task_api.build_instances：调用conductor.ComputeTaskAPI()

/usr/lib/python2.7/dist-packages/nova/conductor/api.py中

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)

conductor_compute_rpcapi指向nova.conductor.rpcapi.ComputeTaskAPI()

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)
    cctxt = self.client.prepare(version='1.5')
    cctxt.cast(context, 'build_instances',
               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,
               block_device_mapping=block_device_mapping,
               legacy_bdm=legacy_bdm)

这是一个RPC调用，最终能够调用到/usr/lib/python2.7/dist-packages/nova/conductor/manager.py的class ConductorManager(manager.Manager)

2. nova-conductor

def build_instances(self, context, instances, image, filter_properties,
        admin_password, injected_files, requested_networks,
        security_groups, block_device_mapping, legacy_bdm=True):
    request_spec = scheduler_utils.build_request_spec(context, image,
                                                      instances)
    # NOTE(alaski): For compatibility until a new scheduler method is used.
    request_spec.update({'block_device_mapping': block_device_mapping,
                         'security_group': security_groups})
    self.scheduler_rpcapi.run_instance(context, request_spec=request_spec,
            admin_password=admin_password, injected_files=injected_files,
            requested_networks=requested_networks, is_first_time=True,
            filter_properties=filter_properties,
            legacy_bdm_in_spec=legacy_bdm)

它调用/usr/lib/python2.7/dist-packages/nova/scheduler/rpcapi.py中class SchedulerAPI(object):

def run_instance(self, ctxt, request_spec, admin_password,
        injected_files, requested_networks, is_first_time,
        filter_properties, legacy_bdm_in_spec=True):
    msg_kwargs = {'request_spec': request_spec,
                  'admin_password': admin_password,
                  'injected_files': injected_files,
                  'requested_networks': requested_networks,
                  'is_first_time': is_first_time,
                  'filter_properties': filter_properties,
                  'legacy_bdm_in_spec': legacy_bdm_in_spec}
    cctxt = self.client.prepare()
    cctxt.cast(ctxt, 'run_instance', **msg_kwargs)

这是一个RPC调用，最终调用到/usr/lib/python2.7/dist-packages/nova/scheduler/manager.py的class SchedulerManager(manager.Manager):

3. nova-scheduler

def run_instance(self, context, request_spec, admin_password,
        injected_files, requested_networks, is_first_time,
        filter_properties, legacy_bdm_in_spec=True):
    return self.driver.schedule_run_instance(context,
        request_spec, admin_password, injected_files,
        requested_networks, is_first_time, filter_properties,
        legacy_bdm_in_spec)

scheduler的driver我们在nova.conf中配置如下：

#scheduler
compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler

/usr/lib/python2.7/dist-packages/nova/scheduler/filter_scheduler.py的class FilterScheduler(driver.Scheduler):

def schedule_run_instance(self, context, request_spec,
                          admin_password, injected_files,
                          requested_networks, is_first_time,
                          filter_properties, legacy_bdm_in_spec):

  • instance_uuids = request_spec.get('instance_uuids')所有instance的id
  • weighed_hosts = self._schedule(context, request_spec, filter_properties, instance_uuids)
  • for num, instance_uuid in enumerate(instance_uuids):
    • weighed_host = weighed_hosts.pop(0)
    • self._provision_resource(context, weighed_host, request_spec, filter_properties, requested_networks, injected_files, admin_password,is_first_time,instance_uuid=instance_uuid,legacy_bdm_in_spec=legacy_bdm_in_spec)

_provision_resource调用

self.compute_rpcapi.run_instance(context,
        instance=updated_instance,
        host=weighed_host.obj.host,
        request_spec=request_spec,
        filter_properties=filter_properties,
        requested_networks=requested_networks,
        injected_files=injected_files,
        admin_password=admin_password, is_first_time=is_first_time,
        node=weighed_host.obj.nodename,
        legacy_bdm_in_spec=legacy_bdm_in_spec)

调用/usr/lib/python2.7/dist-packages/nova/compute/rpcapi.py的class ComputeAPI(object):

def run_instance(self, ctxt, instance, host, request_spec,
                 filter_properties, requested_networks,
                 injected_files, admin_password,
                 is_first_time, node=None, legacy_bdm_in_spec=True):
    # NOTE(russellb) Havana compat
    version = self._get_compat_version('3.0', '2.37')
    instance_p = jsonutils.to_primitive(instance)
    msg_kwargs = {'instance': instance_p, 'request_spec': request_spec,
                  'filter_properties': filter_properties,
                  'requested_networks': requested_networks,
                  'injected_files': injected_files,
                  'admin_password': admin_password,
                  'is_first_time': is_first_time, 'node': node,
                  'legacy_bdm_in_spec': legacy_bdm_in_spec}

    cctxt = self.client.prepare(server=host, version=version)
    cctxt.cast(ctxt, 'run_instance', **msg_kwargs)

这是一个RPC调用，最终调用/usr/lib/python2.7/dist-packages/nova/compute/manager.py的class ComputeManager(manager.Manager)

4. nova-compute

def run_instance(self, context, instance, request_spec,
                 filter_properties, requested_networks,
                 injected_files, admin_password,
                 is_first_time, node, legacy_bdm_in_spec):
    self._run_instance(context, request_spec,
        filter_properties, requested_networks, injected_files,
        admin_password, is_first_time, node, instance,
        legacy_bdm_in_spec)

def _run_instance(self, context, request_spec,
                  filter_properties, requested_networks, injected_files,
                  admin_password, is_first_time, node, instance,
                  legacy_bdm_in_spec):
    instance, network_info = self._build_instance(context,
        request_spec, filter_properties, requested_networks,
        injected_files, admin_password, is_first_time, node,
        instance, image_meta, legacy_bdm_in_spec)

  • security_groups = request_spec.get('security_group')
  • node = self.driver.get_available_nodes(refresh=True)[0]
  • bdms = block_device_obj.BlockDeviceMappingList.get_by_instance_uuid(context, instance['uuid'])
  • injected_files = self._decode_files(injected_files)
  • rt = self._get_resource_tracker(node)
  • with rt.instance_claim(context, instance, limits):
    • macs = self.driver.macs_for_instance(instance)
    • dhcp_options = self.driver.dhcp_options_for_instance(instance)
    • network_info = self._allocate_network(context, instance,
                              requested_networks, macs, security_groups,
                              dhcp_options)
    • self._instance_update(
                              context, instance['uuid'],
                              vm_state=vm_states.BUILDING,
                              task_state=task_states.BLOCK_DEVICE_MAPPING)
    • self._default_block_device_names(context, instance, image_meta, bdms)
    • block_device_info = self._prep_block_device(context, instance, bdms)
    • instance = self._spawn(context, instance, image_meta,
                                             network_info, block_device_info,
                                             injected_files, admin_password,
                                             set_access_ip=set_access_ip)

 

4.1. 配置network

_allocate_network中，状态变成Networking

instance = self._instance_update(context, instance['uuid'],
                                 vm_state=vm_states.BUILDING,
                                 task_state=task_states.NETWORKING,
                                 expected_task_state=[None])

return nova.network.model.NetworkInfoAsyncWrapper(
        self._allocate_network_async, context, instance,
        requested_networks, macs, security_groups, is_vpn,
        dhcp_options)

def _allocate_network_async(self, context, instance, requested_networks,
                            macs, security_groups, is_vpn, dhcp_options):
    nwinfo = self.network_api.allocate_for_instance(
        context, instance, vpn=is_vpn,
        requested_networks=requested_networks,
        macs=macs,
        security_groups=security_groups,
        dhcp_options=dhcp_options)

调用network_api，调用neutron来创建network，nova.network.neutronv2.api.API

调用/usr/lib/python2.7/dist-packages/nova/network/neutronv2/api.py的allocate_for_instance函数

  • neutron = neutronv2.get_client(context)
  • nets = self._get_available_networks(context, instance['project_id'], net_ids)
    • (Pdb) p nets
      [{u'status': u'ACTIVE', u'subnets': [u'bd652c3e-005e-4985-b65e-576c3045e890'], u'name': u'openstack-net', u'admin_state_up': True, u'tenant_id': u'8efa4856fe4b4aa0b6dcf05dc66d4efa', u'router:external': False, u'shared': False, u'id': u'a29561e9-2f32-4765-a0f8-306b870f780b'}]
  • user_security_groups = neutron.list_security_groups(**search_opts).get('security_groups')
    • (Pdb) p security_groups
      [u'default']
  • self._populate_neutron_extension_values(context, instance, port_req_body)
  • created_port = self._create_port(port_client, instance, network_id, port_req_body, fixed_ips.get(network_id),security_group_ids, available_macs, dhcp_opts)
    • (Pdb) p port_req_body
      {'port': {'binding:host_id': u'OpenstackIcehouse2', 'admin_state_up': True, 'network_id': u'a29561e9-2f32-4765-a0f8-306b870f780b', 'tenant_id': u'8efa4856fe4b4aa0b6dcf05dc66d4efa', 'device_owner': u'compute:nova', 'security_groups': [u'b4a79ec8-8552-4074-a410-faa52b30424d'], 'device_id': u'3a5cd5d4-2676-447b-bab4-6acf21feacd6'}}
    • RESP:{'date': 'Mon, 02 Jun 2014 20:56:01 GMT', 'status': '201', 'content-length': '717', 'content-type': 'application/json; charset=UTF-8', 'x-openstack-request-id': 'req-a9ef458b-adfe-41f9-b66a-640cb8d56833'} {"port": {"status": "DOWN", "binding:host_id": "OpenstackIcehouse2", "name": "", "allowed_address_pairs": [], "admin_state_up": true, "network_id": "a29561e9-2f32-4765-a0f8-306b870f780b", "tenant_id": "8efa4856fe4b4aa0b6dcf05dc66d4efa", "binding:vif_details": {"port_filter": true, "ovs_hybrid_plug": true}, "binding:vnic_type": "normal", "binding:vif_type": "ovs", "device_owner": "compute:nova", "mac_address": "fa:16:3e:64:b6:8a", "binding:profile": {}, "fixed_ips": [{"subnet_id": "bd652c3e-005e-4985-b65e-576c3045e890", "ip_address": "192.168.2.19"}], "id": "9d6cd91a-dac8-4523-a692-01dc61c04b21", "security_groups": ["b4a79ec8-8552-4074-a410-faa52b30424d"], "device_id": "3a5cd5d4-2676-447b-bab4-6acf21feacd6"}}
  • nw_info = self.get_instance_nw_info(context, instance, networks=nets, port_ids=ports_in_requested_order)
    • (Pdb) p nw_info
      [VIF({'ovs_interfaceid': u'9d6cd91a-dac8-4523-a692-01dc61c04b21', 'network': Network({'bridge': 'br-int', 'subnets': [Subnet({'ips': [FixedIP({'meta': {}, 'version': 4, 'type': 'fixed', 'floating_ips': [], 'address': u'192.168.2.19'})], 'version': 4, 'meta': {'dhcp_server': u'192.168.2.2'}, 'dns': [IP({'meta': {}, 'version': 4, 'type': 'dns', 'address': u'8.8.8.8'})], 'routes': [], 'cidr': u'192.168.2.0/24', 'gateway': IP({'meta': {}, 'version': 4, 'type': 'gateway', 'address': u'192.168.2.1'})})], 'meta': {'injected': False, 'tenant_id': u'8efa4856fe4b4aa0b6dcf05dc66d4efa'}, 'id': u'a29561e9-2f32-4765-a0f8-306b870f780b', 'label': u'openstack-net'}), 'devname': u'tap9d6cd91a-da', 'qbh_params': None, 'meta': {}, 'details': {u'port_filter': True, u'ovs_hybrid_plug': True}, 'address': u'fa:16:3e:64:b6:8a', 'active': False, 'type': u'ovs', 'id': u'9d6cd91a-dac8-4523-a692-01dc61c04b21', 'qbg_params': None})]

4.2. _spawn instances

/usr/lib/python2.7/dist-packages/nova/compute/manager.py的

def _spawn(self, context, instance, image_meta, network_info,
           block_device_info, injected_files, admin_password,
           set_access_ip=False):
    self.driver.spawn(context, instance, image_meta,
                  injected_files, admin_password,
                  network_info,
                  block_device_info)

在nova.conf中compute_driver=libvirt.LibvirtDriver

所以会最终调用/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py

5. libvirt

/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py的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, block_device_info, image_meta)
    • (Pdb) p disk_info
      {'disk_bus': 'virtio', 'cdrom_bus': 'ide', 'mapping': {'disk': {'bus': 'virtio', 'boot_index': '1', 'type': 'disk', 'dev': 'vda'}, 'root': {'bus': 'virtio', 'boot_index': '1', 'type': 'disk', 'dev': 'vda'}}}
  • self._create_image(context, instance,
                       disk_info['mapping'],
                       network_info=network_info,
                       block_device_info=block_device_info,
                       files=injected_files,
                       admin_pass=admin_password)
  • xml = self.to_xml(context, instance, network_info,
                      disk_info, image_meta,
                      block_device_info=block_device_info,
                      write_to_disk=True)
  • self._create_domain_and_network(context, xml, instance, network_info,
                                    block_device_info)

5.1. 获取Image

/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py的

def _create_image(self, context, instance,
                  disk_mapping, suffix='',
                  disk_images=None, network_info=None,
                  block_device_info=None, files=None,
                  admin_pass=None, inject_files=True):

在这个函数中参数

(Pdb) p disk_images
{'kernel_id': u'', 'image_id': u'6a1489cb-5905-4f97-ae8b-012770818213', 'ramdisk_id': u''}

得到flavor

inst_type = flavors.extract_flavor(instance)

(Pdb) p inst_type
{'root_gb': 20, 'name': 'm1.small', 'ephemeral_gb': 0, 'memory_mb': 2048, 'vcpus': 1, 'swap': 0, 'rxtx_factor': 1.0, 'flavorid': '2', 'vcpu_weight': None, 'id': 5}

下载和缓存image

image('disk').cache(fetch_func=libvirt_utils.fetch_image,
                    context=context,
                    filename=root_fname,
                    size=size,
                    image_id=disk_images['image_id'],
                    user_id=instance['user_id'],
                    project_id=instance['project_id'])

  • 首先会调用/usr/lib/python2.7/dist-packages/nova/virt/libvirt/utils.py的fetch_image
    • images.fetch_to_raw(context, image_id, target, user_id, project_id, max_size=max_size)
    • 会调用/usr/lib/python2.7/dist-packages/nova/virt/images.py的fetch_to_raw，最终调用image_service.download(context, image_id, dst_path=path)，会从glance下载下来image
  • 其次，会调用/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py的cache函数
    • (Pdb) p base
      '/var/lib/nova/instances/_base/4b1ad1f3fa1222ea960f8e373baa4eef880c5ff1'
    • (Pdb) p size
      21474836480
    • 会调用class Qcow2(Image)的create_image(self, prepare_template, base, size, *args, **kwargs)并最后调用到copy_qcow2_image
    • copy_qcow2_image是调用了两个命令：
      • ('qemu-img', 'create', '-f', 'qcow2', '-o', 'backing_file=/var/lib/nova/instances/_base/4b1ad1f3fa1222ea960f8e373baa4eef880c5ff1', '/var/lib/nova/instances/4d169b6a-b921-4e24-83b0-2c36ea4da7d0/disk')
      • ('qemu-img', 'resize', '/var/lib/nova/instances/4d169b6a-b921-4e24-83b0-2c36ea4da7d0/disk', 21474836480)

配置configuration drive

inst_md = instance_metadata.InstanceMetadata(instance, content=files, extra_md=extra_md, network_info=network_info)

with configdrive.ConfigDriveBuilder(instance_md=inst_md) as cdb:
    configdrive_path = self._get_disk_config_path(instance)
    cdb.make_drive(configdrive_path)

配置injection file

self._inject_data(instance, network_info, admin_pass, files, suffix)

5.2. 生成XML

to_xml xml=<domain type="kvm">
  <uuid>33985948-f19d-4d01-be63-989f302c218e</uuid>
  <name>instance-0000001a</name>
  <memory>2097152</memory>
  <vcpu>1</vcpu>
  <sysinfo type="smbios">
    <system>
      <entry name="manufacturer">OpenStack Foundation</entry>
      <entry name="product">OpenStack Nova</entry>
      <entry name="version">2014.1</entry>
      <entry name="serial">21172311-7f0c-44b5-b57c-48e5cc032d12</entry>
      <entry name="uuid">33985948-f19d-4d01-be63-989f302c218e</entry>
    </system>
  </sysinfo>
  <os>
    <type>hvm</type>
    <boot dev="hd"/>
    <smbios mode="sysinfo"/>
  </os>
  <features>
    <acpi/>
    <apic/>
  </features>
  <clock offset="utc">
    <timer name="pit" tickpolicy="delay"/>
    <timer name="rtc" tickpolicy="catchup"/>
    <timer name="hpet" present="no"/>
  </clock>
  <cpu mode="host-model" match="exact"/>
  <devices>
    <disk type="file" device="disk">
      <driver name="qemu" type="qcow2" cache="none"/>
      <source file="/var/lib/nova/instances/33985948-f19d-4d01-be63-989f302c218e/disk"/>
      <target bus="virtio" dev="vda"/>
    </disk>
    <interface type="bridge">
      <mac address="fa:16:3e:f0:c0:b4"/>
      <model type="virtio"/>
      <source bridge="qbr4700fff8-b4"/>
      <target dev="tap4700fff8-b4"/>
    </interface>
    <serial type="file">
      <source path="/var/lib/nova/instances/33985948-f19d-4d01-be63-989f302c218e/console.log"/>
    </serial>
    <serial type="pty"/>
    <input type="tablet" bus="usb"/>
    <graphics type="vnc" autoport="yes" keymap="en-us" listen="0.0.0.0"/>
    <video>
      <model type="cirrus"/>
    </video>
  </devices>
</domain>

5.3.创建Instance，并连接到network

/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py的

def _create_domain_and_network(self, context, xml, instance, network_info,
                               block_device_info=None, power_on=True,
                               reboot=False, vifs_already_plugged=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)
  • domain = self._create_domain(xml, instance=instance, launch_flags=launch_flags, power_on=power_on)

首先是调用/usr/lib/python2.7/dist-packages/nova/virt/libvirt/vif.py的def plug_ovs_hybrid(self, instance, vif):

  • iface_id = self.get_ovs_interfaceid(vif)
    • (Pdb) p iface_id
      u'4700fff8-b437-45fb-8b81-dbd69dec2b5a'
  • br_name = self.get_br_name(vif['id'])
    • (Pdb) p br_name
      u'qbr4700fff8-b4'
  • v1_name, v2_name = self.get_veth_pair_names(vif['id'])
    • (Pdb) p v1_name
      u'qvb4700fff8-b4'
    • (Pdb) p v2_name
      u'qvo4700fff8-b4'
  • utils.execute('brctl', 'addbr', br_name, run_as_root=True)
  • utils.execute('brctl', 'setfd', br_name, 0, run_as_root=True)
  • utils.execute('brctl', 'stp', br_name, 'off', run_as_root=True)
  • utils.execute('tee', ('/sys/class/net/%s/bridge/multicast_snooping' % br_name), process_input='0', run_as_root=True, check_exit_code=[0, 1])
  • linux_net._create_veth_pair(v1_name, v2_name)
  • utils.execute('ip', 'link', 'set', br_name, 'up', run_as_root=True)
  • utils.execute('brctl', 'addif', br_name, v1_name, run_as_root=True)
  • linux_net.create_ovs_vif_port(self.get_bridge_name(vif), v2_name, iface_id, vif['address'], instance['uuid'])
    • (Pdb) p vif
      VIF({'ovs_interfaceid': u'4700fff8-b437-45fb-8b81-dbd69dec2b5a', 'network': Network({'bridge': 'br-int', 'subnets': [Subnet({'ips': [FixedIP({'meta': {}, 'version': 4, 'type': 'fixed', 'floating_ips': [], 'address': u'192.168.2.18'})], 'version': 4, 'meta': {'dhcp_server': u'192.168.2.2'}, 'dns': [IP({'meta': {}, 'version': 4, 'type': 'dns', 'address': u'8.8.8.8'})], 'routes': [], 'cidr': u'192.168.2.0/24', 'gateway': IP({'meta': {}, 'version': 4, 'type': 'gateway', 'address': u'192.168.2.1'})})], 'meta': {'injected': False, 'tenant_id': u'8efa4856fe4b4aa0b6dcf05dc66d4efa'}, 'id': u'a29561e9-2f32-4765-a0f8-306b870f780b', 'label': u'openstack-net'}), 'devname': u'tap4700fff8-b4', 'qbh_params': None, 'meta': {}, 'details': {u'port_filter': True, u'ovs_hybrid_plug': True}, 'address': u'fa:16:3e:f0:c0:b4', 'active': False, 'type': u'ovs', 'id': u'4700fff8-b437-45fb-8b81-dbd69dec2b5a', 'qbg_params': None})
    • _ovs_vsctl(['--', '--if-exists', 'del-port', dev, '--',
                      'add-port', bridge, dev,
                      '--', 'set', 'Interface', dev,
                      'external-ids:iface-id=%s' % iface_id,
                      'external-ids:iface-status=active',
                      'external-ids:attached-mac=%s' % mac,
                      'external-ids:vm-uuid=%s' % instance_id])
    • _set_device_mtu(dev)

其次调用/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py的

def _create_domain(self, xml=None, domain=None,
                        instance=None, launch_flags=0, power_on=True):

  • domain = self._conn.defineXML(xml)
  • domain.createWithFlags(launch_flags)

机器运行起来了。

Icehouse 创建Instance代码分析的更多相关文章

  1. Concurrency Managed Workqueue(三)创建workqueue代码分析

    一.前言 本文主要以__alloc_workqueue_key函数为主线,描述CMWQ中的创建一个workqueue实例的代码过程. 二.WQ_POWER_EFFICIENT的处理 __alloc_w ...

  2. 虚拟机创建流程中neutron代码分析（三）

    前言: 当neutron-server创建了port信息,将port信息写入数据库中.流程返回到nova服务端,接着nova创建的流程继续走.在计算节点中neutron-agent同样要完成很多的工作 ...

  3. 虚拟机创建流程中neutron代码分析（二）

    前言: 当nova服务发送了创建port的restful调用信息之后,在neutron服务中有相应的处理函数来处理调用.根据restful的工作原理,是按照 paste.ini文件中配置好的流程去处理 ...

  4. Hyperledger Fabric(v1.2.0)代码分析1——channel创建

    Hyperledger Fabric(v1.2.0)代码分析1--channel创建 0. e2e_cli Hyperledger Fabric提供了一个e2e的例子,该例中创建了一个基础的区块链网络 ...

  5. [Asp.net 5] DependencyInjection项目代码分析4-微软的实现（4）

    这个系列已经写了6篇,链接地址如下: [Asp.net 5] DependencyInjection项目代码分析 [Asp.net 5] DependencyInjection项目代码分析2-Auto ...

  6. cocos2d-x v3.2 FlappyBird 各个类对象详细代码分析(6)

    今天我们要讲三个类,这三个类应该算比較简单的 HelpLayer类 NumberLayer类 GetLocalScore类 HelpLayer类,主要放了两个图形精灵上去,一个是游戏的名字,一个是提示 ...

  7. Spring AOP实现声明式事务代码分析

    众所周知,Spring的声明式事务是利用AOP手段实现的,所谓"深入一点,你会更快乐",本文试图给出相关代码分析. AOP联盟为增强定义了org.aopalliance.aop.A ...

  8. 手机自动化测试：Appium源码分析之跟踪代码分析八

    手机自动化测试:Appium源码分析之跟踪代码分析八   poptest是国内唯一一家培养测试开发工程师的培训机构,以学员能胜任自动化测试,性能测试,测试工具开发等工作为目标.如果对课程感兴趣,请大家 ...

  9. 《图说VR入门》——googleVR入门代码分析

    本文章由cartzhang编写,转载请注明出处. 所有权利保留. 文章链接:http://blog.csdn.net/cartzhang/article/details/53013843 作者:car ...

随机推荐

  1. margin-top / padding-top 的百分比 到底是多少？

    之前,我以为 margin-top/padding-top 如果设置成%,得到的是 基于父对象总高度的百分比. 但是,这种想法是错的.因为在CSS标准里,是基于父对象宽度的百分比. <style ...

  2. git常用方法

    一.创建项目 git clone xx.git         克隆项目到本地 git init                     初始化本地项目,生成.git文件 二.创建分支,推送分支,合并 ...

  3. swift 导入 .a 和 .h 文件

    一.新建桥接文件,这个很简单,就不介绍了.给个链接方法吧. 二.添加导入 .a 文件,在最后一步选择要导入的 .a 文件. 三.桥接文件里引用头文件,一般 .a 和 .h 文件都是在一个文件夹一起拖入 ...

  4. Swoole 网络通信协议，固定包头。

    网络通信过程中,可能会出现分包和合包的情况.具体情况如https://wiki.swoole.com/wiki/page/484.html文档所讲的.这里测试了下固定包头的协议.示例代码如下 1.解包 ...

  5. vue间通信

    1,父子组件通信 props 传递 父组件: 子组件: 2,子父组件通信 父组件: 子组件: 3,子组件与子组件传递 使用bus.js  如下 传递子组件:  接收子组件

  6. swift两种获取相册资源PHAsset的路径的方法（绝对路径）

    方法中使用到的phasset就是我们取到的PHAsset对象 方法一: let options = PHVideoRequestOptions() options.version = PHVideoR ...

  7. luogu||P1776||宝物筛选||多重背包||dp||二进制优化

    题目描述 终于,破解了千年的难题.小FF找到了王室的宝物室,里面堆满了无数价值连城的宝物……这下小FF可发财了,嘎嘎.但是这里的宝物实在是太多了,小FF的采集车似乎装不下那么多宝物.看来小FF只能含泪 ...

  8. Python之路(第三十八篇) 并发编程：进程同步锁/互斥锁、信号量、事件、队列、生产者消费者模型

    一.进程锁(同步锁/互斥锁) 进程之间数据不共享,但是共享同一套文件系统,所以访问同一个文件,或同一个打印终端,是没有问题的, 而共享带来的是竞争,竞争带来的结果就是错乱,如何控制,就是加锁处理. 例 ...

  9. 项目管理 - PM、 SRS、SOW简介及范例

    PM在一个IT项目中的主要管理任务 http://blog.csdn.net/eaglezhang/article/details/1717171 计算机软件需求说明编制指南 http://blog. ...

  10. mongooDb链接javaapi

    mongodb链接有多种:所以不同链接下的api也不太一样. 1.api比较全面 public void query2(){ String mondburl = Config.getInstance( ...