On Dec 10, 2013, at 1:27 PM, Zane Bitter <zbit...@redhat.com>
 wrote:
> On 10/12/13 12:46, Richard Lee wrote:
>> Hey all,
>> 
>> We're working on a blueprint
>> <https://blueprints.launchpad.net/heat/+spec/preview-stack> that adds
>> the ability to preview what a given template+parameters would create in
>> terms of resources.  We think this would provide significant value for
>> blueprint authors and for other heat users that want to see what
>> someone's template would create before actually launching resources (and
>> possibly having to pay for them).
> 
> +1 for this use case.
> 
> BTW AWS supports something similar, which we never bothered to implement in 
> the compatibility API. You might want to do some research on that as a 
> starting point:
> 
> http://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/API_EstimateTemplateCost.html
> 
> However the fact that we have pluggable resource types would make it very 
> difficult for us to do cost calculations inside Heat (and, in fact, 
> CloudFormation doesn't do that either, it just spits out a URL for their 
> separate calculator) - e.g. it's very hard to know which resources will 
> create, say, a Nova server unless they are all annotated in some way.
> 
> Are you thinking the API will simply return a list of resource types and 
> counts? e.g.:
> 
> {
>   "OS::Nova::Server": 2,
>   "OS::Cinder::Volume": 1,
>   "OS::Neutron::FloatingIP: 1
> }
> 
> If so, +1 for that implementation too. Don't forget that you will have to 
> recurse through provider templates, which may not contain what they say on 
> the tin.

That sounds more than reasonable to me. I don't think we could begin to do any 
sort of meaningful "cost" calculation without having to mostly punt to the 
service provider anyway.

> 
> cheers,
> Zane.
> 
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