Open Stack

On 26/06/15 15:14, Hongbin Lu wrote:
> Hi team,
>
> I would like to start my question by using a sample template:
>
> heat_template_version: 2014-10-16
>
> parameters:
>
>    count:
>
>      type: number
>
>      default: 5
>
>    removal_list:
>
>      type: comma_delimited_list
>
>      default: []
>
> resources:
>
>    sample_group:
>
>      type: OS::Heat::ResourceGroup
>
>      properties:
>
>        count: {get_param: count}
>
>        removal_policies: [{resource_list: {get_param: removal_list}}]
>
>        resource_def:
>
>          type: testnested.yaml
>
> outputs:
>
>    resource_list:
>
> value: # How to output a list of resources of sample_group? Like
> "resource_list: ['0', '1', '2', '3', '4']"?
>
> As showed above, this template has a resource group that contains
> resources defined in a nested template. First, I am going to use this
> template to create a stack. Then, I am going to update the stack to
> scale down the resource group by specifying (through parameters) a
> subset of resources that I want to remove. For example,
>
> $  heat stack-create -f test.yaml test
>
> $ heat stack-show test
>
> $ heat stack-update -f test.yaml -P "count=3;removal_list=1,3" test
>
> I want to know if it is possible to output a “resource_list” that lists
> all the removal candidate, so that I can programmatically process the
> list to compile another list (that is “removal_list”) which will be
> passed back to the template as a parameter. Any help will be appreciated.

This is not really an openstack-dev@ question, and would be better 
directed at the openstack@ mailing list or, preferably, ask.openstack.org.

That said, assuming you're running Juno, the 'outputs' attribute[1] will 
return a dict of the outputs from the ResourceGroup members, so you can 
infer the membership from the keys in that dict.

cheers,
Zane.

[1] 
http://docs.openstack.org/developer/heat/template_guide/openstack.html#OS::Heat::AutoScalingGroup-attrs