Populate list from results (list)

[Stephen Granger]

I'm using the ec2_remote_facts module to get a list of instances based on filters.

I want to create another list that contains the ec2_facts.instances[0-n].private_ip 

This is the logic I'm after

- name: Set server names address for webapp proxy server

      set_fact:

        servers[item]: "{{ ec2_facts.instances[item].private_ip_address }}"

      with_sequence: "start=0 end={{ ec2_facts.instances|(length -1) }}"

but it doesn't work

"msg": "ERROR! 'list object' has no attribute u'0'"

I can manually set each fact

- name: Set server names address for webapp proxy server

      set_fact:

        servers: ["{{ ec2_facts.instances[0].private_ip_address }}", "{{ ec2_facts.instances[1].private_ip_address }}" ]

But this is not optimal as it doesn't work for variable length lists.

--

Steve

[J Hawkesworth]

I think you can do this using the map filter 

something like (untested)

- name: Set server names address for webapp proxy server

      set_fact:

        servers: "{{ ec2_facts.instances|map('private_ip_address')|list }}"

Have a look at: http://jinja.pocoo.org/docs/dev/templates/#map

HTH 

Jon

[Stephen Granger]

Hi Jon,

That helped, I needed to specific attribute='private_ip_address' for a map() arguments and was able to find some more documentation here, http://docs.ansible.com/ansible/playbooks_filters.html#other-useful-filters

I'm now trying to break out subnet ids from subnet_facts

    - name: Get subnets

      ec2_vpc_subnet_facts:

        aws_access_key: "{{ aws_access_key }}"

        aws_secret_key: "{{ aws_secret_key }}"

        region: "{{ aws_region }}"

        security_token: "{{ security_token }}"

        filters:

          vpc-id: "{{ returned_vpc.vpcs[0].id }}"

          "tag:Name": "{{ item }}"

      register: subnetDMZ_facts

      with_items:

        - "{{ DMZ_subnet1 }}"

        - "{{ DMZ_subnet2 }}"

        - "{{ DMZ_subnet3 }}"

I get a data structure like this

ok: [localhost] => {

    "subnetDMZ_facts.results": [

        {

            "_ansible_no_log": false, 

            "changed": false, 

            "invocation": {

                "module_args": {

                    "aws_access_key": "XXXXX", 

                    "aws_secret_key": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER", 

                    "ec2_url": null, 

                    "filters": {

                        "tag:Name": "SubDMZ1", 

                        "vpc-id": "vpc-XXXXXXXX"

                    }, 

                    "profile": null, 

                    "region": "us-west-2", 

                    "security_token": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER", 

                    "validate_certs": true

                }, 

                "module_name": "ec2_vpc_subnet_facts"

            }, 

            "item": "SubDMZ1", 

            "subnets": [

                {

                    "availability_zone": "us-west-2a", 

                    "available_ip_address_count": 57, 

                    "cidr_block": "10.201.0.0/26", 

                    "default_for_az": "false", 

                    "id": "subnet-XXXXXXX", 

                    "map_public_ip_on_launch": "false", 

                    "state": "available", 

                    "tags": {

                        "Name": "SubDMZ1"

                    }, 

                    "vpc_id": "vpc-XXXXXXX"

                }

            ]

        }, 

        {...

Subnets is a list. I was previously manually setting each subnet_id value manually via
subnet_ids: ['{{ subnetDMZ_facts.results[0].subnets[0].id }}', '{{ subnetDMZ_facts.results[1].subnets[0].id }}', '{{ subnetDMZ_facts.results[1].subnets[0].id }}' ]

I tried using the subnet[0].id as the attribute

subnets_map: "{{ subnetDMZ_facts.results|map(attribute='subnets[0].id')|list }}"

fatal: [localhost]: FAILED! => {"failed": true, "msg": "ERROR! 'dict object' has no attribute 'subnets[0]'"}

I can access other vales, just not list items, e.g. 

subnets_map: "{{ subnetDMZ_facts.results|map(attribute='invocation.module_args.aws_access_key')|list }}"

TIA

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--

Steve

[Stephen Granger]

This works

subnets_map: "{{ subnetDMZ_facts.results|map(attribute='subnets.0.id')|list }}"

--

Steve