A way to dump all the vars for a host. Must be used with `--limit`, otherwise, last host wins.

dump_all_vars.yaml

---

- name: Dump all vars
  hosts: all
  tasks:
      - name: Dump all vars
        template: src=scripts/dump_vars.j2 dest=/tmp/ansible.all

dump_vars.j2

Module Variables ("vars"):
==========================
{{ vars | to_nice_json }} 

Environment Variables ("environment"):
======================================
{{ environment | to_nice_json }} 

GROUP NAMES Variables ("group_names"):
======================================
{{ group_names | to_nice_json }}

GROUPS Variables ("groups"):
============================
{{ groups | to_nice_json }}

HOST Variables ("hostvars"):
============================
{{ hostvars | to_nice_json }}