Hi,

Instead of using shell, you could use a lookup plugin that will query the 
ids by name for you.
So when creating the subnets, give them a name and also store them in a 
list, e.g.
mysubnets:
  - subnet1
  - subnet2

You can then define your ELB like this:

     ec2_elb_lb:
        ...
        subnets: "{{ lookup('aws_subnet_ids_from_names', (region, 
mysubnets)) }}"

Where region is a variable containing a region name, i.e. 'eu-west-1'.
This will return a list of the subnet ids that the ec2_elb_lb module 
expects.
To use this, just copy the lookup plugin from here 
<https://github.com/jonhadfield/ansible-lookups> into a directory called 
lookup_plugins in the root of your project.

Jon

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