7:57 a.m.
Hi,
i have a weird problem. I have a vm (KVM) which seems to run fine. I believe the
respective config file for this vm is /etc/libvirt/qemu/MausDB.xml. This is it:
=========================================================
<domain type='kvm'>
<name>MausDB</name>
<uuid>d4c7956c-b57f-967a-0454-99835a3a740b</uuid>
<memory unit='KiB'>2353792</memory>
<currentMemory unit='KiB'>2353792</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-1.4'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/kvm/images/MausDB/disk0.raw'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hda' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0'
target='0' unit='0'/>
</disk>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x1'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:37:92:03'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</interface>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes'/>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x05' function='0x0'/>
</memballoon>
</devices>
</domain>
=============================================================
As you see, the vm has one NIC. Its MAC-Address is: '52:54:00:37:92:03'.
I also see that MAC when i edit the config via virsh.
But when i boot that vm, it has a nic with another MAC: '52:54:00:37:92:B2' ???
lspci shows me just one nic in the vm.
This MAC-Address is also visible in the Virtual Machine Manager.
Pictures you find here: https://hmgubox.helmholtz-muenchen.de:8001/d/51feb02c02/
I thought the xml-file in /etc/libvirt/qemu ist the only responsable one. It is that one
which is configured when i issue a 'edit domain' in virsh. Or ?
Where does the VMM stores the configuration of the domains ?
I found another xml: /var/run/libvirt/qemu/MausDB.xml . Inside it there is the MAC the
booted vm has. What is the purpose of this xml ?
Also ps inside the host shows the MAC which is in the booted vm:
root 28237 4.8 2.4 2886084 2416116 ? Sl Feb29 55:16 /usr/bin/qemu-kvm -name
MausDB -S -machine pc-i440fx-1.4,accel=kvm,usb=off -m 2299 -smp
2,sockets=2,cores=1,threads=1 -uuid d4c7956c-b57f-967a-0454-99835a3a740b -no-user-config
-nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/MausDB.monitor,server,nowait -mon
chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=/var/lib/kvm/images/MausDB/disk0.raw,if=none,id=drive-virtio-disk0,format=raw -device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-drive if=none,id=drive-ide0-0-0,readonly=on,format=raw -device
ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev
tap,fd=22,id=hostnet0,vhost=on,vhostfd=23 -device virtio-net-pci,netdev=hostnet0,id=net0,
mac=52:54:00:37:92:b2,bus=pci.0,addr=0x3 -vnc 127.0.0.1:0 -vga cirrus -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
Can anyone help sorting this out ?
Bernd
--
Bernd Lentes
Systemadministration
institute of developmental genetics
Gebäude 35.34 - Raum 208
HelmholtzZentrum München
bernd.lentes(a)helmholtz-muenchen.de
phone: +49 (0)89 3187 1241
fax: +49 (0)89 3187 2294
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