[libvirt] OpenVZ : cannot assign bridge to any interface

22 Jul 2009

      Hi,

I'm bit confuing between 2 problems with libvirt-0.6.5 for OpenVZ.

[1] bridge was created but no interface assigned to it
[2] virsh dumpxml returns xml in which type is "qemu"

[1] -------------------------------------------------
I tried libvirt-0.6.5 on Fedora8 to create OpenVZ container ( OpenVZ  
kernel is linux-2.6.18 ).
A bridge was seemed to successfully create but no interface could not  
be assigned to the bridge.
Due to that, ping could not reach the guest in container(10.0.1.2).

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
[root@node13 test]# brctl show
bridge name	bridge id		STP enabled	interfaces
br101		8000.000000000000	no

[root@node13 test]# ifconfig -a
br101     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          inet addr:10.0.1.1  Bcast:10.0.1.15  Mask:255.255.255.240
          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:30 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:5031 (4.9 KiB)

eth0      Link encap:Ethernet  HWaddr 00:1C:C4:xx:xx:xx
          inet addr:133.xx.xx.xx  Bcast:133.xx.xx.xx  Mask:255.255.255.0
          inet6 addr: fe80::21c:c4ff:xxxx:xxxx/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:196949 errors:0 dropped:0 overruns:0 frame:0
          TX packets:64300 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:228373526 (217.7 MiB)  TX bytes:5652593 (5.3 MiB)
          Interrupt:169

eth1      Link encap:Ethernet  HWaddr 00:1C:C4:xx:xx:xx
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
          Interrupt:50

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:323 errors:0 dropped:0 overruns:0 frame:0
          TX packets:323 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:29949 (29.2 KiB)  TX bytes:29949 (29.2 KiB)

sit0      Link encap:IPv6-in-IPv4
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

venet0    Link encap:UNSPEC  HWaddr  
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          UP BROADCAST POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

veth101   Link encap:Ethernet  HWaddr 52:54:00:52:C3:FF
          inet6 addr: fe80::5054:ff:fe52:c3ff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

The followings are python script and xml that I tested with.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
[root@node13 test]# cat test.py
import libvirt

conn = libvirt.open('openvz:///system')
conn.networkDefineXML( file('net.xml').read() )
conn.defineXML( file('test.xml').read() )

net = conn.networkLookupByName('guestnet101')
net.create()

guest = conn.lookupByName('101')
guest.create()

[root@node13 test]# cat test.xml
<domain type='openvz' id='101'>
    <name>101</name>
    <os>
        <type>exe</type>
        <init>/sbin/fakeinit.sh</init>
    </os>
    <memory>524288</memory>
    <devices>
        <filesystem type='template'>
            <source name='fedora-10-x86_64'/>
            <target dir='/'/>
        </filesystem>
        <console type='pty'/>
    <interface type='bridge'>
      <mac address="52:54:00:00:01:01" />
      <source bridge='guestnet101'/>
      <target dev='veth101'/>
    </interface>

    </devices>
</domain>

[root@node13 test]# cat net.xml
<network>
  <name>guestnet101</name>
  <bridge name="br101" stp="off" />
  <forward mode="nat"/>
  <ip address="10.0.1.1" netmask="255.255.255.240">
    <dhcp>
      <range start="10.0.1.2" end="10.0.1.2" />
    </dhcp>
  </ip>
</network>
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

[2] -------------------------------------------------
I guess "type" in domain must be 'openvz' but virsh dumpxml returns it  
as 'qemu'.
( The configuration of VE 101 remains in [1] )

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
[root@node13 test]# virsh dumpxml 101
<domain type='qemu' id='101'>
  <name>101</name>
  <uuid>dedee02b-b74f-6e43-f5ec-27050986efa8</uuid>
  <memory>0</memory>
  <currentMemory>0</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type>exe</type>
    <init>/sbin/init</init>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>destroy</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <filesystem type='template'>
      <source name='fedora-10-x86_64'/>
      <target dir='/'/>
    </filesystem>
    <interface type='bridge'>
      <mac address='52:54:00:00:01:01'/>
      <source bridge='guestnet101'/>
      <target dev='veth101'/>
    </interface>
  </devices>
</domain>

[root@node13 test]# virsh net-dumpxml guestnet101
<network>
  <name>guestnet101</name>
  <uuid>5462e7a5-2048-3067-af9d-b134381a3f8a</uuid>
  <forward mode='nat'/>
  <bridge name='br101' stp='off' forwardDelay='0' />
  <ip address='10.0.1.1' netmask='255.255.255.240'>
    <dhcp>
      <range start='10.0.1.2' end='10.0.1.2' />
    </dhcp>
  </ip>
</network>
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Regards.

-----
Yuji Nishida
nishidy@nict.go.jp

[libvirt] OpenVZ : cannot assign bridge to any interface

Yuji NISHIDA