libvirt users - Oct 2015 - Re: Creating network interfaces with specific name in LXC

Hello

I am trying to create interfaces within an LXC container with specific
name. I am using the following XML:

    <interface type='network' name='blah'>
      <source network='dpbr_n_0'/>
    </interface>

This doesn't seem to work; it always ends up creating interface with name
as "eth0".

I found some examples here:
http://libvirt.org/guide/html/Application_Development_Guide-Network_Interfaces-XML_Format.html

That uses interface type as "ethernet" and specifies name also, If I
do
that, I get back an error while starting the container as "Unsupported
network type ethernet".

Appreciate your help.

Regards,
Harish

On Fri, Oct 30, 2015 at 08:16:33PM +0530, Harish Vishwanath
wrote:
>Hello
>
>I am trying to create interfaces within an LXC container with specific
>name. I am using the following XML:
>
>    <interface type='network' name='blah'>
>      <source network='dpbr_n_0'/>
>    </interface>
>
That name='' is not parsed, it won't get saved, it doesn't mean
anything to libvirt.  This particular configuration doesn't say much,
because type=network means all the settings will get set from the
network dpbr_n_0.  See https://libvirt.org/formatdomain.html for all
the things you can configure in <interface/> and what does each option
mean.
>This doesn't seem to work; it always ends up creating interface with
name
>as "eth0".
>
>I found some examples here:
>http://libvirt.org/guide/html/Application_Development_Guide-Network_Interfaces-XML_Format.html
>
>That uses interface type as "ethernet" and specifies name also, If
I do
>that, I get back an error while starting the container as "Unsupported
>network type ethernet".
>
>Appreciate your help.
>
>Regards,
>Harish
>_______________________________________________
>libvirt-users mailing list
>libvirt-users@redhat.com
>https://www.redhat.com/mailman/listinfo/libvirt-users

Thanks Martin. What I would like to achieve is govern the interface name
created within the container, so that my application can take different
actions on different interfaces (such as eth0, eth1 etc.,).

Libvirt's lxc driver seems to create interfaces as eth0, eth1 and so on,
when there are multiple <interface /> entries in the domain xml. How can I
request for a particular interface name?

I saw that in some of the examples in https://libvirt.org/formatdomain.html,
<source dev=" " network=" "> is specified. I tried
setting the "dev"
attribute of source tag, but it doesn't look like that is being parsed and
stored either.


Regards,
Harish

On Fri, Oct 30, 2015 at 8:32 PM, Martin Kletzander <mkletzan@redhat.com>
wrote:
> On Fri, Oct 30, 2015 at 08:16:33PM +0530, Harish Vishwanath wrote:
>
>> Hello
>>
>> I am trying to create interfaces within an LXC container with specific
>> name. I am using the following XML:
>>
>>    <interface type='network' name='blah'>
>>      <source network='dpbr_n_0'/>
>>    </interface>
>>
>>
> That name='' is not parsed, it won't get saved, it doesn't
mean
> anything to libvirt.  This particular configuration doesn't say much,
> because type=network means all the settings will get set from the
> network dpbr_n_0.  See https://libvirt.org/formatdomain.html for all
> the things you can configure in <interface/> and what does each
option
> mean.
>
> This doesn't seem to work; it always ends up creating interface with
name
>> as "eth0".
>>
>> I found some examples here:
>>
>>
http://libvirt.org/guide/html/Application_Development_Guide-Network_Interfaces-XML_Format.html
>>
>> That uses interface type as "ethernet" and specifies name
also, If I do
>> that, I get back an error while starting the container as
"Unsupported
>> network type ethernet".
>>
>> Appreciate your help.
>>
>> Regards,
>> Harish
>>
>
> _______________________________________________
>> libvirt-users mailing list
>> libvirt-users@redhat.com
>> https://www.redhat.com/mailman/listinfo/libvirt-users
>>
>