Creating a dictionary of Hostnames to IPs with Ansible - linux

Question

Been hitting my head against this problem for three or four days. I'm trying to write an Ansible playbook that creates a Docker Swarm cluster comprised of my four Docker hosts. As part of this, I'm gathering the Ansible hostnames and specific ethernet device IPv4 addresses from each node via Ansible facts and creating a dictionary:
- name: "Clear swarm_ips dictionary"
set_fact:
swarm_ips: "{{ swarm_ips | default([]) }}"
- name: "Create dictionary with enp42s0 IP and hostname of manager"
set_fact:
swarm_ips: "{{ swarm_ips | combine ({item.key : item.value}) }}"
with_items:
- { 'key': '{{ ansible_facts.hostname | string }}.ip' , 'value': '{{ ansible_facts.enp42s0.ipv4.address | string }}' }
when: (ansible_facts.hostname == "manager")
- name: "Add eth0 IP and hostname of worker[1,2] to swarm_ips"
set_fact:
swarm_ips: "{{ swarm_ips | combine ({item.key : item.value}) }}"
with_items:
- { 'key': '{{ ansible_facts.hostname | string }}.ip' , 'value': '{{ ansible_facts.eth0.ipv4.address | string }}' }
when: (ansible_facts.hostname == "worker1") or
(ansible_facts.hostname == "worker2")
- name: "Add eth0 IP and hostname of worker0 to swarm_ips dictionary"
set_fact:
swarm_ips: "{{ swarm_ips | combine ({item.key : item.value}) }}"
with_items:
- { 'key': '{{ ansible_facts.hostname | string }}.ip' , 'value': '{{ ansible_facts.br0.ipv4.address | string }}' }
when: (ansible_facts.hostname == "worker0")
- name: "Echo eth0 IP for all nodes"
debug:
var: swarm_ips
I expect the output of the last step in the play to be something like what follows:
ok: {
"swarm_ips": {
"manager.ip": "10.0.1.203"
"worker0.ip": "10.0.1.42"
"worker1.ip": "10.0.1.201"
"worker2.ip": "10.0.1.252"
}
}
Instead I get
ok: [manager.local] => {
"swarm_ips": {
"manager.ip": "10.0.1.203"
}
}
ok: [worker0.local] => {
"swarm_ips": {
"worker0.ip": "10.0.1.42"
}
}
ok: [worker1.local] => {
"swarm_ips": {
"worker1.ip": "10.0.1.201"
}
}
ok: [worker2.local] => {
"swarm_ips": {
"worker2.ip": "10.0.1.252"
}
}
There's likely a way I could run some or all of this on localhost and use hostvars to get information about the cluster hosts, but I think this should also work as I expect. Any idea what am I missing, either specifically or conceptually?