Ansible nested loop over hostvars - loops

Question

I am trying to loop over all of the hosts that I've in the host_vars folder and get their corresponding interfaces, the interfaces var itself is a list.
problem: I can access the host_vars and get the desired data, except that the interface variable is a list and I want to loop over it.
What it looks like:
Loop through host_vars
Get the first host on the list
Loop over the interfaces
Repeat
To simplify things I am using debug in my example:
- name: TEST_101
debug:
var:
hostvars[item]['interfaces'][X]['name']
loop: "{{ groups['all'] }}"
X: is the corresponding interface index
The following are two of the host_vars files.
core_01
---
ansible_host: 192.168.1.202
site: XX-DC
role: CORE
model: CSR1000v
interfaces:
- name: vlan 1
description: "EDGE_RTR IF"
ipv4: 192.168.100.3/24
state: merged
enabled: true
- name: vlan 100
description: "IT IF"
ipv4: 172.31.1.1/24
state: merged
enabled: true
core_02
---
ansible_host: 192.168.12.210
interfaces:
- name: ethernet 0/0
description: "ISP_01 IF PRIMARY" #The discription on the interface
ipv4: 10.0.0.2/24
state: merged
enabled: true
- name: ethernet 0/1
description: "CORE_SW IF PRIMARY" #The discription on the interface
ipv4: 192.168.100.1/24
state: merged
enabled: true
The output when the script is run:
PLAY [Populate NetBox DataBase] ************************************************************************************************************************************************************
TASK [build_netbox_db : Create interface within Netbox with only required information] *****************************************************************************************************
ok: [localhost] => (item=edge_01) => {
"ansible_loop_var": "item",
"hostvars[item]['interfaces'][0]['name']": "ethernet 0/0",
"item": "edge_01"
}
ok: [localhost] => (item=edge_02) => {
"ansible_loop_var": "item",
"hostvars[item]['interfaces'][0]['name']": "ethernet 0/0",
"item": "edge_02"
}
ok: [localhost] => (item=csr1k_01) => {
"ansible_loop_var": "item",
"hostvars[item]['interfaces'][0]['name']": "ethernet 0/0",
"item": "csr1k_01"
}
ok: [localhost] => (item=core_01) => {
"ansible_loop_var": "item",
"hostvars[item]['interfaces'][0]['name']": "vlan 1",
"item": "core_01"
}
PLAY RECAP *********************************************************************************************************************************************************************************
localhost : ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
X is replaced with an index number.
In a sense, I want to loop twice, once over the host, then over the interfaces of that particular host.

Answer 1

As soon as you delegate the task back to your local, then you don't need to loop on the groups['all'] anymore, and you can let Ansible do the normal process of targeting all the hosts defined in the hosts directive.
Then, you just have to loop on the interfaces variable of all hosts.
Given the playbook:
- hosts: core_01,core_02
## I am limiting myslef to two hosts here,
## but `all` would do just fine if you want to target all
## hosts in your inventory
gather_facts: no
tasks:
- debug:
msg: "{{ item.name }}"
loop: "{{ interfaces }}"
delegate_to: 127.0.0.1
loop_control:
label: "{{ item.name }}"
This will yield the recap:
PLAY [core_01,core_02] ********************************************************************************************
TASK [debug] ******************************************************************************************************
ok: [core_01] => (item=vlan 1) =>
msg: vlan 1
ok: [core_01] => (item=vlan 100) =>
msg: vlan 100
ok: [core_02] => (item=ethernet 0/0) =>
msg: ethernet 0/0
ok: [core_02] => (item=ethernet 0/1) =>
msg: ethernet 0/1
PLAY RECAP ********************************************************************************************************
core_01 : ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
core_02 : ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0