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. > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev