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

Yuji NISHIDA nishidy at nict.go.jp
Fri Jul 24 08:10:40 UTC 2009


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 at 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 at node13 test]# brctl show
> bridge name	bridge id		STP enabled	interfaces
> br101		8000.000000000000	no
>
> [root at 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 at 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 at 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 at 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 at 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 at 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 at nict.go.jp




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