On Tue, Nov 26, 2019 at 09:23:58AM +0100, Maksym Planeta wrote:
> I want to configure OVS to communicate between containers. I configure OVS
> and see it creating some additional interfaces, like gre, or system. But
> when I create a container with an isolated network namespace these devices
> are still visible.
> 
> How do I make OVS devices invisible inside the container unless I explicitly
> say so?
...
> I would not expect gre0, gretap0, and erspan0 to be present.

These aren't OVS devices.  As I understand it, they're global system
devices that are always present in every namespace if their drivers are
loaded.  A Google search for gretap0 turns this up as the first hit, for
example: https://github.com/lxc/lxd/issues/3338
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