all:
  children:
    site_a:
      hosts:
        a1:
          ansible_host: "{{ lookup('env', 'A1_MGMT_IP') }}"
        a2:
          ansible_host: "{{ lookup('env', 'A2_MGMT_IP') }}"
        a3:
          ansible_host: "{{ lookup('env', 'A3_MGMT_IP') }}"
      vars:
        ansible_user: "{{ lookup('env', 'SSH_USER') }}"
        ansible_ssh_private_key_file: "{{ lookup('env', 'SSH_PRIVATE_KEY_FILE') }}"