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[libvirt] Re: OpenVZ : cannot assign bridge to any interface



Hi,

[1] bridge was created but no interface assigned to it

I found two evidences which could cause that.
One is my mistake in XML and the other is in /usr/sbin/vznetcfg.


    <source bridge='guestnet101'/>

I should have specified bridge name here like
<source bridge='br101'/>


vznetcfg runs vznetaddbr but it couldn't do without knowing what the path is. In the context of vznetcfg, there is a line "VZNETCFG='/etc/vz/ vznet.conf'" which I think should know the path.
But there was not such a file.

I have confirmed that it could succeed after fixing these issues and
it was not caused by bugs of libvirt after all.

Anyway, thanks Daniel.

Best Regards.

-----
Yuji Nishida
nishidy nict go jp

On 2009/07/22, at 14:55, Yuji NISHIDA wrote:

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


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