From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Koch <thomas@koch.ro>
Subject: kvm networking (NAT) on debian unstable with libvirt
Date: Thu, 17 Sep 2009 09:37:26 +0200
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Already sent to libvirt without response.

Hi,

I'm trying to get NAT networking running as described in=20
http://libvirt.org/formatnetwork.html#examplesNAT

But in the guest, ifconfig shows only the lo interface. I created the k=
vm=20
image (debian lenny 5.0.3) directly with qemu-img and kvm, because virt=
-
install also didn't work. Afterwards I created the XML file for libvirt=
:

<domain type=3D'kvm'>
  <name>hadoop1</name>
  <uuid>c40b6644-362a-e5ab-8825-cd1a7fbe24eb</uuid>
  <memory>524288</memory>
  <currentMemory>524288</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch=3D'x86_64' machine=3D'pc'>hvm</type>
    <boot dev=3D'hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset=3D'utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type=3D'file' device=3D'disk'>
      <driver name=3D'qemu' type=3D'qcow2'/>
      <source file=3D'/var/lib/libvirt/images/hadoop1.qcow2'/>
      <target dev=3D'hda' bus=3D'ide'/>
    </disk>
    <interface type=3D'network'>
      <mac address=3D'52:54:00:05:74:bb'/>
      <source network=3D'default'/>
      <model type=3D'virtio'/>
    </interface>
    <!--serial type=3D'pty'>
      <target port=3D'0'/>
    </serial>
    <console type=3D'pty'>
      <target port=3D'0'/>
    </console-->
    <input type=3D'mouse' bus=3D'ps2'/>
    <graphics type=3D'vnc' port=3D'-1' autoport=3D'yes' keymap=3D'de-ch=
'/>
    <video>
      <model type=3D'cirrus' vram=3D'9216' heads=3D'1'/>
    </video>
  </devices>
</domain>

The network config is:

<network>
  <name>default</name>
  <bridge name=3D"virbr0" />
  <forward/>
  <ip address=3D"192.168.122.1" netmask=3D"255.255.255.0">
    <dhcp>
      <range start=3D"192.168.122.2" end=3D"192.168.122.254" />
    </dhcp>
  </ip>
</network>

ifconfig of the host (needs cleanup, I know):

eth1      Link encap:Ethernet  Hardware Adresse 00:1c:25:18:4d:e6 =20
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1      =20
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0      =20
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0    =20
          Kollisionen:0 Sendewarteschlangenl=E4nge:1000             =20
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)                  =20
          Speicher:fe200000-fe220000                              =20

eth1:avahi Link encap:Ethernet  Hardware Adresse 00:1c:25:18:4d:e6 =20
          inet Adresse:169.254.6.97  Bcast:169.254.255.255  Maske:255.2=
55.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1           =
     =20
          Speicher:fe200000-fe220000                                   =
     =20

lo        Link encap:Lokale Schleife =20
          inet Adresse:127.0.0.1  Maske:255.0.0.0
          inet6-Adresse: ::1/128 G=FCltigkeitsbereich:Maschine
          UP LOOPBACK RUNNING  MTU:16436  Metrik:1         =20
          RX packets:160751 errors:0 dropped:0 overruns:0 frame:0
          TX packets:160751 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl=E4nge:0                =20
          RX bytes:27262569 (25.9 MiB)  TX bytes:27262569 (25.9 MiB)

virbr0    Link encap:Ethernet  Hardware Adresse 4a:30:15:4d:b5:0d =20
          inet Adresse:192.168.122.1  Bcast:192.168.122.255 =20
Maske:255.255.255.0
          inet6-Adresse: fe80::8804:ecff:febc:fa54/64=20
G=FCltigkeitsbereich:Verbindung
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:299 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl=E4nge:0
          RX bytes:0 (0.0 B)  TX bytes:47842 (46.7 KiB)

vnet0     Link encap:Ethernet  Hardware Adresse 4a:30:15:4d:b5:0d
          inet6-Adresse: fe80::4830:15ff:fe4d:b50d/64=20
G=FCltigkeitsbereich:Verbindung
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:128 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl=E4nge:500
          RX bytes:0 (0.0 B)  TX bytes:16426 (16.0 KiB)

wlan0     Link encap:Ethernet  Hardware Adresse 00:1d:e0:08:89:21
          inet Adresse:192.168.178.23  Bcast:192.168.178.255 =20
Maske:255.255.255.0
          inet6-Adresse: fe80::21d:e0ff:fe08:8921/64=20
G=FCltigkeitsbereich:Verbindung
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
          RX packets:10608 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10358 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl=E4nge:1000
          RX bytes:7515487 (7.1 MiB)  TX bytes:1367200 (1.3 MiB)

wmaster0  Link encap:UNSPEC  Hardware Adresse 00-1D-
E0-08-89-21-00-00-00-00-00-00-00-00-00-00
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenl=E4nge:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

The call to KVM from the libvirt log is (linebreaks by me):

LC_ALL=3DC PATH=3D/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/=
usr/bin
HOME=3D/root USER=3Droot LOGNAME=3Droot /usr/bin/kvm=20
-S -M pc -m 512 -smp 1 -name hadoop1=20
-uuid c40b6644-362a-e5ab-8825-cd1a7fbe24eb=20
-monitor unix:/var/run/libvirt/qemu/hadoop1.monitor,server,nowait=20
-boot c -drive file=3D/var/lib/libvirt/images/hadoop1.qcow2,
               if=3Dide,index=3D0,boot=3Don,format=3Dqcow2=20
-net nic,macaddr=3D52:54:00:05:74:bb,vlan=3D0,model=3Dvirtio,name=3Dvir=
tio.0=20
-net tap,fd=3D16,vlan=3D0,name=3Dtap.0=20
-serial none -parallel none -usb -vnc 127.0.0.1:0 -k de-ch -vga cirrus

Thanks for any help,
Thomas Koch, http://www.koch.ro