main.yaml

# Create an instance on NeCTAR
- name: Create instances
  os_server:
    name: '{{ item.instance_name }}'
    image: '{{ item.instance_image }}'
    key_name: '{{ item.instance_key_name }}'
    flavor: '{{ item.instance_flavor }}'
    availability_zone: '{{ availability_zone }}'
    security_groups: '{{sg_names }}'
    auto_floating_ip: yes
    wait: yes
    timeout: 600
    state: present
  loop: '{{ instances }}'
  register: os_instance

- debug:
    msg: "Instance {{ instance_name }} has been created. IP address is {{ os_instance.openstack.public_v4 }}"
  when: os_instance.openstack is defined

#get a list of instance Ids from the return value of os_instance
- name: Create a list of instance Ids
  set_fact:
    os_instance_ids: '{{ os_instance_ids|default([]) + [ item.id ] }}'
  loop: '{{ os_instance.results }}'

- debug:
    msg: "Instance {{ os_instance_ids }} has been created."
  when: os_instance.name is defined