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How to create dynamic variables in ansible

If you're gathering facts, you can access host vars via the normal jinja2 + variable lookup:

e.g.

- hosts: serverA.example.org

  gather_facts: True

  ...

  tasks:

    - set_fact:

        taco_tuesday: False 

and then, if this has run, on another host:

- hosts: serverB.example.org

  ...

  tasks:

    - debug: var="{{ hostvars['serverA.example.org']['ansible_memtotal_mb'] }}"

    - debug: var="{{ hostvars['serverA.example.org']['taco_tuesday'] }}"

Keep in mind that if you have multiple Ansible control machines (where you call ansible and ansible-playbook from), you should take advantage of the fact that Ansible can store its facts/variables in a cache (currently Redis and json), that way the control machines are less likely to have different host vars. With this, you could set your control machines to use a file in a shared folder (which has its risks -- what if two control machines are running on the same host at the same time?), or set/get facts from a Redis server.