How to print array variable with set_fact to use in ansible add_host module

Question

I am trying to dynamically build the inventory of an "elasticsearch" cluster using the add_hosts module.

I have these tasks:

In the first task (Identify ES nodes in cluster), I query the elasticsearch API to get the names of the nodes and save it in the "es_nodes" array

    - name: Identify ES nodes in cluster
      uri:
        url: http://localhost:9200/_nodes/_all/ip
        method: GET
        return_content: yes
        body_format: json
        failed_when: false
      register: es_nodes

In the second (Extract Node Names), I extract the names of the nodes and save them in a "nodo" array

    - name: Extract Node Names
      set_fact:
        nodo: "{{ es_nodes.json.nodes | map('regex_search', '([^\\s]+)') | select('string') | list }}"

And in the third (Create new var for IP Node), (I try, but I can't) get the IP using a loop with the names of the nodes. I manage to print the name of the variable "es_nodes.json.nodes. < nodo > .ip" but I cannot print the content, that is, the IP!

    - name: Create new var for Node IP
      set_fact:
        nodo_ip: es_nodes.json.nodes.{{ item }}.ip
      with_items: "{{ nodo }}"

In the verbose output show:

ok: [<ansible_ip>] => (item=GxcbPcQ0Qe6vSFOde0zFwg) => {"ansible_facts": {"nodo_ip": "es_nodes.json.nodes.GxcbPcQ0Qe6vSFOde0zFwg.ip"}, "changed": false, "item": "GxcbPcQ0Qe6vSFOde0zFwg"}
ok: [<ansible_ip>] => (item=V2bdDTnwTCexY67U36YE8g) => {"ansible_facts": {"nodo_ip": "es_nodes.json.nodes.V2bdDTnwTCexY67U36YE8g.ip"}, "changed": false, "item": "V2bdDTnwTCexY67U36YE8g"}

My final intention is to obtain an array with the IPs of the elasticsearch cluster "node_ip" to dynamically add them to the inventory with "add_hosts" and be able to work on the host group: "elasticsearch-security"

I imagine it would be something like this:

    - name: Add host to group elasticsearch-security
      add_host:
        name: "{{ item }}"
        groups: elasticsearch-security
      with_items: "{{ nodo_ip }}"

I would appreciate your ideas to know the correct syntax to print the IP and not the name of the node in the third task or a "different" way of doing the same to create the inventory dynamically.

Answer 1

If I'll well understood, you need to build a variable from the content of another var (got from with_items) and then retrieve the contents of the variable.

One possibility is to create a separate playbook which will be included from the main script and use with_items on the include tasks. Here is a simple example that you can adapt to your case:

Main playbook:

- hosts: localhost
  vars:
    es_nodes_x: "val x"
    es_nodes_y: "val y"
  tasks:
    # Create new var for Node IP
    - include: sub.yml param={{item}}
      with_items:
        - "x"
        - "y"

Included playbook (sub.yml):

- set_fact:
    v: "{{param}}"
- debug:
    msg: "{{ vars['es_nodes_' + v] }}"