[ansible-project] Constructing a List.

[r***@gmail.com]

Hi,

Using a 'shell' task I'm obtaining a list of subnet id's from Amazon, these
subnet id's I want to pass in to the ec2_elb_lb task.
However this task accepts a list for Subnets only, so is there a way to
dynamically construct a list out of the id's that I obtained?

Thanks,
Nico

[Jon Hadfield]

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

[Igor Homyakov]

Hi Jon,

That is awesome. Thank you for sharing.

-- Best, Igor

Post by Jon Hadfield
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.
- subnet1
- subnet2
...
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 into a directory called
lookup_plugins in the root of your project.
Jon
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