---
- hosts: nova_discovery_nodes
  gather_facts: True
  vars:
    container_name: "{{ nova_host_discovery_container }}"
  tasks:
    - block:
      - name: Check if discovery container exist
        shell: docker ps | grep {{ container_name }}$
        register: is_discovery_container_running
        ignore_errors: True
      - name: Set fact discover_hosts
        set_fact:
          discover_hosts: "{{ is_discovery_container_running.rc == 0 }}"
    - name: Discovering nova hosts
      command: docker exec {{ container_name }} nova-manage cell_v2 discover_hosts --by-service
      become: true
      changed_when: false
      delegate_to: '{{ groups[''nova_discovery_nodes''][0] }}'
      run_once: true
      when:
        - discover_hosts|bool