Here is the task to use in order to achieve that :
- name: Dump all vars
action: template src=dumpall.j2 dest=ansible.all
And here is the template to use with it :
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 }}