---
- name: Create inventory based on extra_vars
  hosts: all
  gather_facts: no
  become: no


  vars_files:
    - vars/defaults.yml


  vars:
    provision_host: "{{ tower_provision_host | default(ansible_play_hosts | join(',')) }}"


  tasks:
    - name: "Create in-memory inventory"
      add_host:
        name: "{{ item }}"
        groups:
          - remdiation
      delegate_to: localhost
      loop: "{{ provision_host.split(',') }}"


# =========================================================================== #


- name: Update remdiation hosts
  hosts: remdiation
  gather_facts: no
  become: yes


  tasks:
    - name: Update host packages to latest releases
      package: name=* state=latest
      async: 1800
      poll : 3


...