[openstack-dev] Unified Guest Agent proposal
ijw.ubuntu at cack.org.uk
Thu Dec 12 19:02:45 UTC 2013
On 12 December 2013 19:48, Clint Byrum <clint at fewbar.com> wrote:
> Excerpts from Jay Pipes's message of 2013-12-12 10:15:13 -0800:
> > On 12/10/2013 03:49 PM, Ian Wells wrote:
> > > On 10 December 2013 20:55, Clint Byrum <clint at fewbar.com
> > > <mailto:clint at fewbar.com>> wrote:
> > I've read through this email thread with quite a bit of curiosity, and I
> > have to say what Ian says above makes a lot of sense to me. If Neutron
> > can handle the creation of a "management vNIC" that has some associated
> > iptables rules governing it that provides a level of security for guest
> > <-> host and guest <-> $OpenStackService, then the transport problem
> > domain is essentially solved, and Neutron can be happily ignorant (as it
> > should be) of any guest agent communication with anything else.
> Indeed I think it could work, however I think the NIC is unnecessary.
> Seems likely even with a second NIC that said address will be something
> like 169.254.169.254 (or the ipv6 equivalent?).
There *is* no ipv6 equivalent, which is one standing problem. Another is
that (and admittedly you can quibble about this problem's significance) you
need a router on a network to be able to get to 169.254.169.254 - I raise
that because the obvious use case for multiple networks is to have a net
which is *not* attached to the outside world so that you can layer e.g. a
private DB service behind your app servers.
Neither of these are criticisms of your suggestion as much as they are
standing issues with the current architecture.
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