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Hi Gary,


First of all you don't need to use "depends_on", because using
"get_attr" already create implicit dependency from rg_a.
About getting Null instead of real Ip address:
It sounds like a bug, but IMO, it's expected behavior, because I
suppose it happens due to:
 - you create in rg_a some Server and probably it goes to active state
before ip address becomes available for get_attr. It is necessary to
check, but if it's try to add wait condition for this resource, then
you will get created rg_a with fully available resources and I suppose
IP will be available.

On 9 March 2016 at 13:14, Duan, Li-Gong (Gary, HPServers-Core-OE-PSC)
<li-gong.duan at hpe.com> wrote:
> Hi,
>
>
>
> I have 3 Heat templates using ResourceGroup. There are 2 resource
> groups(rg_a and rg_b) and rg_b depends on rg_a.  and rg_b requires the IP
> address of rg_a as the paremeter of rg_b. I use “rg_a_public_ip: {get_attr:
> [rg_a, rg_a_public_ip]}” to get the IP address of rg_a both in the section
> of rg_b parameters (rg_b/properties/resource_def/properties) and the section
> of outputs.
>
> As per my observation,  rg_a_public_ip shows “null” in the parameter section
> of rg_b. while rg_a_public_ip shows the correct IP address in the outputs
> section of the yaml file.
>
>
>
> My questions are:
>
> 1)      Does this behavior is expected as designed or this is a bug?
>
> 2)      What is the alternative solution for the above case(user want to get
> the run-time information of the instance when creating the second resource
> group)  if this behavior is expected?
>
>
>
> ------- a.yaml -------------------
>
> resources:
>
> rg_a:
>
>   type: OS::Heat::ResourceGroup
>
>   properties:
>
>       count: 1
>
>       resource_def:
>
>           type: b.yaml
>
>           properties:
>
>                …
>
>
>
> rg_b:
>
> type: OS::Heat::ResourceGroup
>
> depends_on:
>
>         -rg_a
>
> properties:
>
>     count: 2
>
>     resource_def:
>
>         type: c.yaml
>
>         properties:
>
>             rg_a_public_ip: {get_attr: [rg_a, rg_a_public_ip]}
> --------------------  the value is “null”
>
>             …
>
>
>
> outputs:
>
>    rg_a_public_ip: {get_attr: [rg_a, rg_a_public_ip]}
> ---------------------  the value is correct.
>
> --------------------------
>
>
>
> ------b.yaml  --------------------
>
> …
>
> resources:
>
>     rg_a:
>
> type: OS::Nova::Server
>
> properties:
>
>      …
>
> outputs:
>
>      rg_a_public_ip:
>
>          value: {get_attr: [rg_a, networks, public, 0]}
>
> --------------------------
>
>
>
> ---------- c.yaml --------------------
>
> parameters:
>
> rg_a_public_ip:
>
>      type: string
>
>      description: IP of rg_a
>
> …
>
> resources:
>
> rg_b:
>
>     type: OS::Nova::Server
>
>     properties:
>
>          …
>
>     outputs:
>
>          …
>
> ---------------------------------------
>
>
>
> Regards,
>
> Gary
>
>
>
>
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-- 
Regards,
Sergey.