Creating a RDS subnet group using with_items + registered vpc variable

[Timo Ahokas]

Hi,

I'm trying to use the rds_subnet_group module to create a subnet group with all the subnets defined in my VPC, but I'm having trouble finding a way of using the subnet ids from a registered vpc variable.

So, first I create a VPC & register the response:

  - name: Create VPC

    local_action: 

      module: ec2_vpc

      state: present

      subnets: ...

      route_tables: ...

    register: vpc

This works well and the result looks like:

TASK: [debug var=vpc] ********************************************************* 

ok: [localhost] => {

    "vpc": {

        "changed": true, 

        "invocation": {

            "module_args": "", 

            "module_name": "ec2_vpc"

        }, 

        "subnets": [

            {

                "az": "eu-west-11", 

                "cidr": "10.55.81.0/24", 

                "id": "subnet-d1d21ea6", 

                "resource_tags": {

                    "Environment": "test", 

                    "Name": "test_euw1a_app", 

                }

            },

            { ... } ] }

Now I'd like to use the subnet ids (subnets.id) in this response when creating a RDS subnet with all of them attached:

  - name: Create DB subnet group 

    local_action:

      module: rds_subnet_group

      state: present

      name: "rds-sg"

      description: "rds-sg"

      subnets: 

        - "{{ item.id }}"

    with_items: vpc.subnets

The problem is that if I have the with_item on the same level of local_action it seems to make N calls to rds_subnet_group (each with one of the ids) with fail with:

msg: DB Subnet Group doesn't meet availability zone coverage requirement. Please add subnets to cover at least 2 availability zones. Current coverage: 1

So I'd like to add all the subnets in one go (single call with all subnet ids defined for the "subnets" parameter). With_items doesn't seem to work when it's nested on the same level with the other params (subnets/state) - instead I get the error: 

fatal: [localhost -> 127.0.0.1] => One or more undefined variables: 'item' is undefined

What would be the best way to use all the vpc.subnets.id values in a list and supply those to rds_subnet_group.subnets in one go?

Best regards,

Timo

[Timo Ahokas]

Found the answer luckily by searching the groups. 

Documented here if someone stumbles on the same thing (no need for with_items):

subnets: "{{ vpc.subnets | map(attribute='id') | list}}"

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[Dan Vaida]

It's quite frustrating that the 'rds_subnet_group' produces too few debug info:

< TASK: debug var=rds_sg_creation >

 --------------------------------------- 

        \   ^__^

         \  (oo)\_______

            (__)\       )\/\

                ||----w |

                ||     ||

ok: [localhost] => {

    "rds_sg_creation": {

        "changed": false, 

        "invocation": {

            "module_args": "", 

            "module_name": "rds_subnet_group"

        }

    }

}