tasks/public_address.yml

---
- name: Normalized name for public address
  cache:
    key: 'public_address'
    value: '{{ inventory_hostname }}'

- block:

  - name: Update cache for public ip on AWS
    ec2_facts:
    when: ansible_ec2_public_ipv4 is not defined

  - name: Normalized name for public address on AWS
    cache:
      key: 'public_address'
      value: '{{ ansible_ec2_public_ipv4 | default(inventory_hostname) }}'

  when: ansible_bios_version is defined and ansible_bios_version | search('amazon')