[openstack-dev] [Solum/Heat] Is Solum really necessary?

Georgy Okrokvertskhov gokrokvertskhov at mirantis.com
Thu Nov 14 19:27:34 UTC 2013


I think that Heat is mostly focused on deployment even with new software
configs and convergence. HOT template is quite "static" description of
desired state we want to achieve and it is up to Heat engine how to achieve
this state.

Solum is focused on managing the process of converting source code to some
deployable entity (image or container). The power of Solum is an ability to
fully describe and control the process of building and testing of
application. Some of the stages of build and testing process might require
actual deployment and stack creation, but this is not an ultimate goal of
the Solum.

If someone will try to use just Heat for building process description they
will figure out quickly that they need different templates for different
build\testing stages. As Heat itself can't modify templates you will need
some external mechanism for template creation, and this is what Solum
actually does.


On Thu, Nov 14, 2013 at 11:08 AM, Christopher Armstrong <
chris.armstrong at rackspace.com> wrote:

> On Thu, Nov 14, 2013 at 11:04 AM, Sam Alba <sam.alba at gmail.com> wrote:
>> Hi Jay,
>> I think Heat is an ingredient for Solum. When you build a PaaS, you
>> need to control the app at different levels:
>> #1 describing your app (basically your stack)
>> #2 Pushing your code
>> #3 Deploying it
>> #4 Controlling the runtime (restart, get logs, scale, changing
>> resources allocation, etc...)
>> I think Heat is a major component for step 3. But I think Heat's job
>> ends at the end of the deployment (the status of the stack is
>> "COMPLETED" in Heat after processing the template correctly). It's
>> nice though to rely on Heat's template generation for describing the
>> stack, it's one more thing to delegate to Heat.
>> In other words, I see Heat as an engine for deployment (at least in
>> the context of Solum) and have something on top to manage the other
>> steps.
> I'd say that Heat does (or should do) more than just the initial
> deployment -- especially with recent discussion around healing /
> convergence.
> --
> IRC: radix
> Christopher Armstrong
> Rackspace
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Georgy Okrokvertskhov
Technical Program Manager,
Cloud and Infrastructure Services,
Tel. +1 650 963 9828
Mob. +1 650 996 3284
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