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> which requires VLAN info to be pushed to the host. I keep hearing "bare
metal will never need to know about VLANs" so I want to quash that ASAP.

That's leaking implementation details though if the bare metal host only
needs to be on one network. It also creates a security risk if the bare
metal node is untrusted.

If the tagging is to make it so it can access multiple networks, then that
makes sense for now but it should ultimately be replaced by the vlan trunk
ports extension being worked on this cycle that decouples the underlying
network transport from what gets tagged to the VM/bare metal.
On Jul 17, 2015 11:47 AM, "Jim Rollenhagen" <jim at jimrollenhagen.com> wrote:

> On Fri, Jul 17, 2015 at 10:56:36AM -0600, Kevin Benton wrote:
> > Check out my comments on the review. Only Neutron knows whether or not an
> > instance needs to do manual tagging based on the plugin/driver loaded.
> >
> > For example, Ironic/bare metal ports can be bound by neutron with a
> correct
> > driver so they shouldn't get the VLAN information at the instance level
> in
> > those cases. Nova has no way to know whether Neutron is configured this
> way
> > so Neutron should have an explicit response in the port binding
> information
> > indicating that an instance needs to tag.
>
> Agree. However, I just want to point out that there are neutron drivers
> that exist today[0] that support bonded NICs with trunked VLANs, which
> requires VLAN info to be pushed to the host. I keep hearing "bare metal
> will never need to know about VLANs" so I want to quash that ASAP.
>
> As far as Neutron sending the flag to decide whether the instance should
> tag packets, +1, I think that should work.
>
> // jim
> >
> > On Fri, Jul 17, 2015 at 9:51 AM, Jim Rollenhagen <jim at jimrollenhagen.com
> >
> > wrote:
> >
> > > On Fri, Jul 17, 2015 at 01:06:46PM +0100, John Garbutt wrote:
> > > > On 17 July 2015 at 11:23, Sean Dague <sean at dague.net> wrote:
> > > > > On 07/16/2015 06:06 PM, Sean M. Collins wrote:
> > > > >> On Thu, Jul 16, 2015 at 01:23:29PM PDT, Mathieu Gagné wrote:
> > > > >>> So it looks like there is a missing part in this feature. There
> > > should
> > > > >>> be a way to "hide" this information if the instance does not
> require
> > > to
> > > > >>> configure vlan interfaces to make network functional.
> > > > >>
> > > > >> I just commented on the review, but the provider network API
> extension
> > > > >> is admin only, most likely for the reasons that I think someone
> has
> > > > >> already mentioned, that it exposes details of the phyiscal network
> > > > >> layout that should not be exposed to tenants.
> > > > >
> > > > > So, clearly, under some circumstances the network operator wants to
> > > > > expose this information, because there was the request for that
> > > feature.
> > > > > The question in my mind is what circumstances are those, and what
> > > > > additional information needs to be provided here.
> > > > >
> > > > > There is always a balance between the private cloud case which
> wants to
> > > > > enable more self service from users (and where the users are often
> also
> > > > > the operators), and the public cloud case where the users are
> outsiders
> > > > > and we want to hide as much as possible from them.
> > > > >
> > > > > For instance, would an additional attribute on a provider network
> that
> > > > > says "this is cool to tell people about" be an acceptable
> approach? Is
> > > > > there some other creative way to tell our infrastructure that these
> > > > > artifacts are meant to be exposed in this installation?
> > > > >
> > > > > Just kicking around ideas, because I know a pile of gate hardware
> for
> > > > > everyone to use is at the other side of answers to these
> questions. And
> > > > > given that we've been running full capacity for days now, keeping
> this
> > > > > ball moving forward would be great.
> > > >
> > > > Maybe we just need to add policy around who gets to see that extra
> > > > detail, and maybe hide it by default?
> > > >
> > > > Would that deal with the concerns here?
> > >
> > > I'm not so sure. There are certain Neutron plugins that work with
> > > certain virt drivers (Ironic) that require this information to be
> passed
> > > to all instances built by that virt driver. However, it doesn't (and
> > > probably shouldn't, as to not confuse cloud-init/etc) need to be passed
> > > to other instances. I think the conditional for passing this as
> metadata
> > > is going to need to be some combination of operator config, Neutron
> > > config/driver, and virt driver.
> > >
> > > I know we don't like networking things to be conditional on the virt
> > > driver, but Ironic is working on feature parity with virt for
> > > networking, and baremetal networking is vastly different than virt
> > > networking. I think we're going to have to accept that.
> > >
> > > // jim
> > >
> > > >
> > > > Thanks,
> > > > John
> > > >
> > > >
> > >
> __________________________________________________________________________
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> >
> >
> >
> > --
> > Kevin Benton
>
> >
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