[root@hostname linux-node2 ~]# cat /etc/libvirt/qemu/instance-0000000f.xml 
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
  virsh edit instance-0000000f
or other application using the libvirt API.
-->

<domain type=‘kvm‘>
  <name>instance-0000000f</name>
  <uuid>e7585ece-c8e9-4ad8-8796-8a58bca459bf</uuid>
  <metadata>
    <nova:instance xmlns:nova="http://openstack.org/xmlns/libvirt/nova/1.0">
      <nova:package version="12.0.4-1.el7"/>
      <nova:name>hello-instance</nova:name>
      <nova:creationTime>2018-10-10 13:22:45</nova:creationTime>
      <nova:flavor name="m1.tiny">
        <nova:memory>512</nova:memory>
        <nova:disk>1</nova:disk>
        <nova:swap>0</nova:swap>
        <nova:ephemeral>0</nova:ephemeral>
        <nova:vcpus>1</nova:vcpus>
      </nova:flavor>
      <nova:owner>
        <nova:user uuid="8ce3700aed4e428d9ce51b05685ae0a6">demo</nova:user>
        <nova:project uuid="29b7833bc24e41d7b4c1d8c77de81e88">demo</nova:project>
      </nova:owner>
      <nova:root type="image" uuid="0297b83c-f9d7-4c19-ab05-762fd4616c49"/>
    </nova:instance>
  </metadata>
  <memory unit=‘KiB‘>524288</memory>
  <currentMemory unit=‘KiB‘>524288</currentMemory>
  <vcpu placement=‘static‘>1</vcpu>
  <cputune>
    <shares>1024</shares>
  </cputune>
  <sysinfo type=‘smbios‘>
    <system>
      <entry name=‘manufacturer‘>Fedora Project</entry>
      <entry name=‘product‘>OpenStack Nova</entry>
      <entry name=‘version‘>12.0.4-1.el7</entry>
      <entry name=‘serial‘>10488a90-1077-49ad-a5f8-26ba6bc70b2d</entry>
      <entry name=‘uuid‘>e7585ece-c8e9-4ad8-8796-8a58bca459bf</entry>
      <entry name=‘family‘>Virtual Machine</entry>
    </system>
  </sysinfo>
  <os>
    <type arch=‘x86_64‘ machine=‘pc-i440fx-rhel7.0.0‘>hvm</type>
    <boot dev=‘hd‘/>
    <smbios mode=‘sysinfo‘/>
  </os>
  <features>
    <acpi/>
    <apic/>
  </features>
  <cpu mode=‘host-model‘ check=‘partial‘>
    <model fallback=‘allow‘/>
    <topology sockets=‘1‘ cores=‘1‘ threads=‘1‘/>
  </cpu>
  <clock offset=‘utc‘>
    <timer name=‘pit‘ tickpolicy=‘delay‘/>
    <timer name=‘rtc‘ tickpolicy=‘catchup‘/>
    <timer name=‘hpet‘ present=‘no‘/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type=‘file‘ device=‘disk‘>
      <driver name=‘qemu‘ type=‘qcow2‘ cache=‘none‘/>
      <source file=‘/var/lib/nova/instances/e7585ece-c8e9-4ad8-8796-8a58bca459bf/disk‘/>
      <target dev=‘vda‘ bus=‘virtio‘/>
      <address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x04‘ function=‘0x0‘/>
    </disk>
    <controller type=‘usb‘ index=‘0‘ model=‘piix3-uhci‘>
      <address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x01‘ function=‘0x2‘/>
    </controller>
    <controller type=‘pci‘ index=‘0‘ model=‘pci-root‘/>
    <interface type=‘bridge‘>
      <mac address=‘fa:16:3e:f4:6f:fe‘/>
      <source bridge=‘brq9252cb78-d1‘/>
      <target dev=‘tapf761b1bc-25‘/>
      <model type=‘virtio‘/>
      <address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x03‘ function=‘0x0‘/>
    </interface>
    <serial type=‘file‘>
      <source path=‘/var/lib/nova/instances/e7585ece-c8e9-4ad8-8796-8a58bca459bf/console.log‘/>
      <target type=‘isa-serial‘ port=‘0‘>
        <model name=‘isa-serial‘/>
      </target>
    </serial>
    <serial type=‘pty‘>
      <target type=‘isa-serial‘ port=‘1‘>
        <model name=‘isa-serial‘/>
      </target>
    </serial>
    <console type=‘file‘>
      <source path=‘/var/lib/nova/instances/e7585ece-c8e9-4ad8-8796-8a58bca459bf/console.log‘/>
      <target type=‘serial‘ port=‘0‘/>
    </console>
    <input type=‘tablet‘ bus=‘usb‘>
      <address type=‘usb‘ bus=‘0‘ port=‘1‘/>
    </input>
    <input type=‘mouse‘ bus=‘ps2‘/>
    <input type=‘keyboard‘ bus=‘ps2‘/>
    <graphics type=‘vnc‘ port=‘-1‘ autoport=‘yes‘ listen=‘0.0.0.0‘ keymap=‘en-us‘>
      <listen type=‘address‘ address=‘0.0.0.0‘/>
    </graphics>
    <video>
      <model type=‘cirrus‘ vram=‘16384‘ heads=‘1‘ primary=‘yes‘/>
      <address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x02‘ function=‘0x0‘/>
    </video>
    <memballoon model=‘virtio‘>
      <stats period=‘10‘/>
      <address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x05‘ function=‘0x0‘/>
    </memballoon>
  </devices>
</domain>
 

OpenStack網絡分類：
公共網絡：想租戶提供訪問或者API調用
管理網絡：雲中物理機之間的通信
存儲網絡：雲中存儲的網絡，如ISCSI或GlusterFS使用
服務網絡：虛擬機內部使用的網絡

單一扁平網絡：

OpenStack Neutron：

OpenStack-liberty版網絡介紹（八）