all:
  children:
    relay:
      hosts:
        relay-server:
          ansible_host: "YOUR_RELAY_IP"
          # SSH user: set to "root" or a non-root user with passwordless sudo (e.g., "ubuntu")
          ansible_user: "YOUR_SSH_USER"
    landing:
      hosts:
        landing-server:
          ansible_host: "YOUR_LANDING_IP"
          ansible_user: "YOUR_SSH_USER"