[openstack-dev] [Heat] Resource dependencies

Shaunak Kashyap shaunak.kashyap at RACKSPACE.COM
Fri Mar 21 13:56:27 UTC 2014


Thanks for the explanation, Thomas. Appreciate it!

Shaunak

On Mar 21, 2014, at 12:37 AM, Thomas Spatzier <thomas.spatzier at de.ibm.com> wrote:

> Shaunak Kashyap <shaunak.kashyap at RACKSPACE.COM> wrote on 21/03/2014
> 05:26:50:
> 
>> From: Shaunak Kashyap <shaunak.kashyap at RACKSPACE.COM>
>> To: "openstack-dev at lists.openstack.org"
> <openstack-dev at lists.openstack.org>
>> Date: 21/03/2014 05:29
>> Subject: [openstack-dev] [Heat] Resource dependencies
>> 
>> Hi,
>> 
>> In a Heat template, what does it mean for a resource to depend on
>> another resource? As in, what is the impact of creating a dependency?
> 
> When a resource depends on another resource, this means that the Heat
> engine will only start processing this resource as soon as the other
> resource it depends on has been created. If a resource depends on multiple
> resources, all those other resources have to be created before processing
> the depedent resource.
> 
>> 
>> I read http://docs.openstack.org/developer/heat/template_guide/
>> hot_spec.html#resources-section and found this definition of the
>> “depends_on” attribute:
>> 
>>> This optional attribute allows for specifying dependencies of the
>> current resource on one or more other resources. Please refer to
>> section hot_spec_resources_dependencies for details.
>> 
>> 
>> Unfortunately, I can’t seem to find the referenced
>> “hot_spec_resources_dependencies” section anywhere.
> 
> I just checked the source in github and the section is there:
> 
> https://github.com/openstack/heat/blob/master/doc/source/template_guide/hot_spec.rst#L452
> 
> It only looks like the wrong heading markup is used. Nice spotting
> actually; I will fix it.
> 
>> 
>> Thank you,
>> 
>> Shaunak
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>> 
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