Re: Live migration using a specified networking adapter

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Jing-Wei Su (jwsu1986@gmail.com) wrote:
> Hello experts,
> 
> 
> I have a network topology like this diagram.
> 
> When start live migration moving a VM from Host A to B,
> 
> the migration process uses either 10GbE (10.0.0.1) or 1 GbE (10.0.0.2),
> 
> but the user cannot specify the source NIC by current migrate command.
> 
> 
> To solve the problem, my rough idea is to add a source ipv4:port argument,
> 
> the migration command seems like
> 
> ```
> 
> migrate -b tcp:10.0.0.1:4444 -d tcp:10.0.0.3:4444.

I'm not sure what the OS lets us do, but if it lets us pick the IP and
port I think that would work; I don't think you need another tcp:
since we already know which protocol we're using.

> 
> ```
> 
> Is it an available solution? Or, is there any concern and sugesstion?
> 
> Besides the idea, is there any good way to this issue?

It's unusual; I don't think I've seen anyone ask for it before.
I assume there's a wayto get the host network stack to prefer
the 10GbE interface.
Or to use separate subnets; rememember that each interface
can have multiple IP addresses.

Dave

> 
>    +-----------------------------------------------------+
>    |                     10GbE switch                    |
>    +-----------------------------------------------------+
>            |            |                |
>            |            |                |
>            |            |                |
>   10.0.0.1 |    10.0.0.2|        10.0.0.3|
>    +-+----------+-+--------+-+  +--+----------+---------+
>    |  |10GbE NIC | |1GbE NIC||  |  |10GbE NIE |         |
>    |  +----------+ +--------+|  |  +----------+         |
>    |                         |  |                       |
>    |      +---------+        |  |                       |
>    |      |   VM    |        |  |                       |
>    |      +---------+        |  |                       |
>    +-------------------------+  +-----------------------+
>            Host A                         Host B
> 
> 
> Thank you.
> 
> 
> Regards,
> 
> Derek.
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK