[libvirt] Creating multiple network interfaces in libvirt Domain.

[Ryota Ozaki]

Hi Kumar

On Thu, Apr 29, 2010 at 9:50 PM, Ryota Ozaki <ozaki.ryota at gmail.com> wrote:
> On Wed, Apr 28, 2010 at 5:56 PM, Kumar L Srikanth-B22348
> <B22348 at freescale.com> wrote:
>> Hi,
>>
>> I want to create a Domain with two interfaces. I am using LXC hypervisor in
>> the libvirt.
>>
>> My domain XML is shown below:
>>
>> <domain type='lxc' id='1'>
>>
>>   <name>srikanth_vm2</name>
>>
>>     <memory>500000</memory>
>>
>>       <os>
>>
>>           <type>exe</type>
>>
>>           <init>/bin/sh</init>
>>
>>       </os>
>>
>>       <vcpu>1</vcpu>
>>
>>       <clock offset='utc'/>
>>
>>       <on_poweroff>destroy</on_poweroff>
>>
>>       <on_reboot>restart</on_reboot>
>>
>>       <on_crash>destroy</on_crash>
>>
>>       <devices>
>>
>>         <emulator>/usr/libexec/libvirt_lxc</emulator>
>>
>>         <filesystem type='mount'>
>>
>>           <source dir='/root/lxc/fedora1'/>
>>
>>           <target dir='/'/>
>>
>>         </filesystem>
>>
>>         <interface type='network'>
>>
>>           <source network='default'/>
>>
>>         </interface>
>>
>>         <interface type='network'>
>>
>>           <source network='default'/>
>>
>>         </interface>
>>
>>         <console type='pty' />
>>
>>       </devices>
>>
>> </domain>
>>
>>
>>
>> I am able to define the Domain. But, I am not able to start the Domain.
>> While starting the domain, I am getting the following error:
>>
>>
>>
>> error: Failed to start domain srikanth_vm2
>>
>> error: internal error Failed to create veth device pair: 512
>>
>>
>>
>> Can you please let me know where I am going wrong?
>
> You should be doing correct.

Sorry, my English was wrong. I wanted to say 'You were doing correct thing'.

And I've confirmed the following patch fixes your problem.
So I'll send the patch to ML later.

Thanks,
  ozaki-r

>
> I found a bug in lxc_driver.c. Could you try the following patch?
>
> diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
> index 2851a2a..018e9f8 100644
> --- a/src/lxc/lxc_driver.c
> +++ b/src/lxc/lxc_driver.c
> @@ -883,6 +883,9 @@ static int lxcSetupInterfaces(virConnectPtr conn,
>             goto error_exit;
>         }
>
> +        /* Prevent auto-assigned names re-used */
> +        parentVeth[0] = '\0';
> +        containerVeth[0] = '\0';
>     }
>
>     rc = 0;
> ---
>
>
>>
>>
>>
>> Regards,
>>
>> Srikanth.
>>
>> --
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>>
>