[OpenStack Foundation] [openstack-dev] [board][tc][all] One Platform – Containers/Bare Metal? (Re: Board of Directors Meeting)

Devdatta Kulkarni devdatta.kulkarni at RACKSPACE.COM
Wed Apr 13 02:28:52 UTC 2016


Reading through the thread I thought of adding following points which	might be relevant to this discussion.

1) Related to the point of providing an abstraction for deploying apps to different form factors: 
OpenStack Solum is a project which allows deploying of applications starting from
their source code. Currently we support following deployment options:
(a) deploying app containers in a setup where nova is configured to use nova-docker driver
(b) deploying app containers on a VM with one container	per VM configuration
(c) deploying app containers to a COE such as a Docker swarm cluster (currently	under development)

For (a) and (b) we use parameterized Heat templates. For (c), we currently assume that
a COE cluster is already created. Solum has a feature whereby app	developers can provide
different kinds of parameters with their	app deployment request.
This feature is used to provide cluster creds with the app deployment request.

The deployment option is controlled by the operator at the time
of Solum deployment. Solum's architecture is such that it is straightforward
to add new deployers. I haven't looked at Ironic so won't be able to comment how difficult/easy
it would be to add a Ironic deployer in Solum. As Joshua mentioned, it will be interesting
to consider different constraints (density, performance, isolation) when choosing the
form factor to deploy app containers. Of course, it will also depend on how other
OpenStack services are configured within that particular OpenStack setup.

2) Related to the point of high-level application description:
In Solum, we use a simple yaml format for describing an app to Solum. Example of an app file can be found here:

We have been planning to work on multi-container/microservice-based apps next, and have a spec for that:

Any comments/feedback on the spec is welcome.

Lastly, in case you want to try out Solum, here is a link to setting up a development environment:

and getting started guide:


From: Joshua Harlow <harlowja at fastmail.com>
Sent: Tuesday, April 12, 2016 2:16 PM
To: Flavio Percoco; OpenStack Development Mailing List (not for usage questions)
Cc: foundation at lists.openstack.org
Subject: Re: [openstack-dev] [OpenStack Foundation] [board][tc][all] One Platform – Containers/Bare Metal? (Re: Board of Directors Meeting)

Flavio Percoco wrote:
> On 11/04/16 18:05 +0000, Amrith Kumar wrote:
>> Adrian, thx for your detailed mail.
>> Yes, I was hopeful of a silver bullet and as we’ve discussed before (I
>> think it
>> was Vancouver), there’s likely no silver bullet in this area. After that
>> conversation, and some further experimentation, I found that even if
>> Trove had
>> access to a single Compute API, there were other significant
>> complications
>> further down the road, and I didn’t pursue the project further at the
>> time.
> Adrian, Amrith,
> I've spent enough time researching on this area during the last month
> and my
> conclusion is pretty much the above. There's no silver bullet in this
> area and
> I'd argue there shouldn't be one. Containers, bare metal and VMs differ
> in such
> a way (feature-wise) that it'd not be good, as far as deploying
> databases goes,
> for there to be one compute API. Containers allow for a different
> deployment
> architecture than VMs and so does bare metal.

Just some thoughts from me, but why focus on the
compute/container/baremetal API at all?

I'd almost like a way that just describes how my app should be
interconnected, what is required to get it going, and the features
and/or scheduling requirements for different parts of those app.

To me it feels like this isn't a compute API or really a heat API but
something else. Maybe it's closer to the docker compose API/template
format or something like it.

Perhaps such a thing needs a new project. I'm not sure, but it does feel
like that as developers we should be able to make such a thing that
still exposes the more advanced functionality of the underlying API so
that it can be used if really needed...

Maybe this is similar to an app-catalog, but that doesn't quite feel
like it's the right thing either so maybe somewhere in between...

IMHO I'd be nice to have a unified story around what this thing is, so
that we as a community can drive (as a single group) toward that, maybe
this is where the product working group can help and we as a developer
community can also try to unify behind...

P.S. name for project should be 'silver' related, ha.


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