Looping in hostvars - ansible

Question

I'm wondering if it is possible to perform a loop in the hostvars folder when using Ansible?
Here is what I've tried but haven't had success in making it work - or is it just not possible to do?
---
list_pool: 'list ltm pool {{ items }}'
with_items:
- 'abc123'
- 'def456'
I would use the "list_pool" variable in a playbook afterward:
- name: List pool
bigip_command:
server: "{{ some_server }}"
user: "{{ some_user }}"
password: "{{ some_password }}"
commands:
- "{{ list_pool }}"
validate_certs: no
delegate_to: localhost

Answer 1

Not sure what you mean when you say you want to loop over hostvars folder.
From what I can interpret from your tasks is: "You need to execute big-ip command list ltm <pool-name> for multiple pools in the list list_pool"
If that's what you're after, this should work:
- name: Set list_pool fact
set_fact:
list_pool: "{{ list_pool | default([]) + [item] }}"
with_items:
- 'abc123'
- 'def456'
- name: List pool
bigip_command:
server: "{{ some_server }}"
user: "{{ some_user }}"
password: "{{ some_password }}"
commands:
- "list ltm {{ item }}"
validate_certs: no
delegate_to: localhost
with_items: "{{ list_pool }}"

Answer 2

I got this working with the following solution:
hostvars file would look like this:
---
pre_checks:
checks:
pool:
- name: "pool_123"
- name: "pool_456"
...
And the play would look like this:
--output truncated---
- name: Fetch device host_vars
set_fact:
device_config: "{{ ((lookup('file','{{playbook_dir}}/host_vars/{{inventory_hostname}}.yml')) | from_yaml) }}"
- name: Check pool
bigip_command:
server: "{{ inventory_hostname }}"
user: "{{ remote_username }}"
password: "{{ remote_passwd }}"
commands:
- "list ltm pool {{ item }}"
validate_certs: no
with_items:
- "{{ device_config.pre_checks | json_query('checks.pool[*].name') }}"
delegate_to: localhost
when: "'active' in Active_LTM['stdout'][0]"
register: Pre_Checks
- name: Verify pool
debug: var=item
with_items: "{{ Pre_Checks.results | map(attribute='stdout_lines') | list }}"