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Re: [libvirt] Creating multiple network interfaces in libvirt Domain.



On Wed, Apr 28, 2010 at 5:56 PM, Kumar L Srikanth-B22348
<B22348 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.

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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