Create Variable From Ansible Facts - variables

Question

I have four systems, in those I need to extract facts then use them as variables on a jinja 2 template.
In Ansible i have:
vars:
office1:
web01:
myip: 10.10.10.10 // or fact
peer: 10.10.10.20
web02
myip: 10.10.10.20 // or fact
peer: 10.10.10.10
office2:
web01:
myip: 10.20.20.30 // or fact
peer: 10.20.20.40
web02
myip: 10.20.20.40 // or fact
peer: 10.20.20.30
On the jinja 2 template I have:
# Config File:
host_name: {{ ansible_hostname }} // web01
host_ip: {{ ansible_eth0.ipv4.address }}
host_peer: {{ office1."{{ ansible_hostname }}".peer }}
I however get error that Ansible variable: office1.ansible_hostname.peer is not defined.
Any help with this would be greatly appreciated.

Answer 1

Expansion in Ansible is not recursive. Try the expansion below
host_peer: {{ office1[ansible_hostname].peer }}
For example the play below
- hosts: test_01
gather_facts: yes
vars:
office1:
test_01:
myip: 10.20.20.30
peer: 10.20.20.40
tasks:
- template:
src: template.j2
dest: /scratch/test_01.cfg
with template.j2
# Config File:
host_name: {{ ansible_hostname }}
host_peer: {{ office1[ansible_hostname].peer }}
gives
# cat /scratch/test_01.cfg
# Config File:
host_name: test_01
host_peer: 10.20.20.40
To answer the question
Q: "Create Variable From Ansible Facts"
A: An option would be to use lookup vars. For example the play below
vars:
var1: var1
var2: var2
var3: var3
tasks:
- debug:
msg: "{{ lookup('vars', 'var' + item) }}"
with_sequence: start=1 end=3
gives (abridged)
"msg": "var1"
"msg": "var2"
"msg": "var3"