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Liping Mao (limao) <limao at cisco.com> wrote:

> Hi Kuryr team,
>
> When the network in neutron using overlay for vm,
> it will use dhcp option to control the VM interface MTU,
> but for docker, the ip address does not get from dhcp.
> So it will not set up proper MTU in container.
>
> Two work-around in my mind now:
> 1. Set the default MTU in docker to 1450 or less.
> 2. Manually configure MTU after container start up.
>
> But both of these are not good, the idea way in my mind
> is when libnetwork Call remote driver create network,
> kuryr create neutron network, then return Proper MTU to libnetwork,
> docker use this MTU for this network. But docker remote driver
> does not support this.
>
> Or maybe let user config MTU in remote driver,
> a little similar with overlay driver:
> https://github.com/docker/libnetwork/pull/1349

Please don’t allow to configure MTU in any specific way, just make sure  
that the MTU value on neutron network is applied on the container side.  
Also, enforcing it to 1450 is not going to work for lots and lots of cases.  
Enforcing it to anything won’t work, because MTUs depend on network type.

>
> But now, seems like remote driver will not do similar things.
>
> Any idea to solve this problem? Thanks.
>
>
> Regards,
> Liping Mao
>
>
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