[libvirt] Different mac address used in libvirtd
Hi,
I found libvirtd will create vnet0 with a different mac other than the one defined in
domain file. The mac in Domain file will be used by qemu-kvm.
I want to know how libvirtd decides the mac for vnet0, Who can give me a hint about the
location of the libvirtd codes which does this work?
I cannot find how the libvirtd translates the mac from one defined in domain file to
vnet0's one in src/util/bridge.c: brSetInterfaceMac()
Thanks
Yong Sheng Gong
[root@robinlinux eclipsecdt]# virsh dumpxml 2
<domain type='kvm' id='2'>
<name>instance-00000002</name>
<uuid>03e9993b-eafa-4021-b929-4a51ce9635d5</uuid>
<memory>524288</memory>
<currentMemory>524288</currentMemory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64' machine='pc-0.14'>hvm</type>
<kernel>/var/lib/nova/instances/instance-00000002/kernel</kernel>
<initrd>/var/lib/nova/instances/instance-00000002/ramdisk</initrd>
<cmdline>root=/dev/vda console=ttyS0</cmdline>
<boot dev='hd'/>
</os>
<features>
<acpi/>
</features>
<clock offset='utc'>
<timer name='pit' tickpolicy='delay'/>
<timer name='rtc' tickpolicy='catchup'/>
</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/instance-00000002/disk'/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
</disk>
<interface type='bridge'>
<mac address='fa:16:3e:28:64:c2'/>
<source bridge='br100'/>
<target dev='vnet0'/>
<filterref filter='nova-instance-instance-00000002-fa163e2864c2'>
<parameter name='DHCPSERVER' value='10.0.1.1'/>
<parameter name='PROJNET' value='10.0.1.0'/>
<parameter name='PROJMASK' value='255.255.255.0'/>
<parameter name='IP' value='10.0.1.2'/>
</filterref>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</interface>
<serial type='file'>
<source
path='/var/lib/nova/instances/instance-00000002/console.log'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<serial type='pty'>
<source path='/dev/pts/1'/>
<target port='1'/>
<alias name='serial1'/>
</serial>
<console type='file'>
<source
path='/var/lib/nova/instances/instance-00000002/console.log'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='tablet' bus='usb'>
<alias name='input0'/>
</input>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='5900' autoport='yes'
listen='127.0.0.1' keymap='en-us'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x05' function='0x0'/>
</memballoon>
</devices>
</domain>
[root@robinlinux eclipsecdt]# ifconfig vnet0
vnet0 Link encap:Ethernet HWaddr FE:16:3E:28:64:C2
inet6 addr: fe80::fc16:3eff:fe28:64c2/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:553 errors:0 dropped:0 overruns:0 frame:0
TX packets:1485 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:136360 (133.1 KiB) TX bytes:280590 (274.0 KiB)