discover_computes.yml

---
# We need to wait for all expected compute services to register before running
# cells v2 host discovery. This includes virtualised compute services and
# ironic compute services.
# Work with --limit by including only hosts in ansible_play_batch.
- name: Build a list of expected compute service hosts
  vars:
    # For virt, use ansible_nodename rather than inventory_hostname, since this
    # is similar to what nova uses internally as its default for the
    # [DEFAULT] host config option.
    virt_compute_service_hosts: >-
      {{ groups['compute'] |
         intersect(ansible_play_batch) |
         map('extract', hostvars, 'ansible_nodename') |
         list }}
    # For ironic, use {{ansible_hostname}}-ironic since this is what we
    # configure for [DEFAULT] host in nova.conf.
    ironic_compute_service_hosts: >-
      {{ (groups['nova-compute-ironic'] |
          intersect(ansible_play_batch) |
          map('extract', hostvars, 'ansible_hostname') |
          map('regex_replace', '^(.*)$', '\1-ironic') |
          list)
         if enable_ironic | bool else [] }}
  set_fact:
    expected_compute_service_hosts: "{{ virt_compute_service_hosts + ironic_compute_service_hosts }}"
  run_once: True
  delegate_to: "{{ groups['nova-api'][0] }}"

- name: Waiting for nova-compute services to register themselves
  become: true
  command: >
    docker exec kolla_toolbox openstack
    --os-interface internal
    --os-auth-url {{ keystone_admin_url }}
    --os-identity-api-version 3
    --os-project-domain-name {{ openstack_auth.domain_name }}
    --os-tenant-name {{ openstack_auth.project_name }}
    --os-username {{ openstack_auth.username }}
    --os-password {{ keystone_admin_password }}
    --os-user-domain-name {{ openstack_auth.domain_name }}
    --os-region-name {{ openstack_region_name }}
    compute service list --format json --column Host --service nova-compute
  register: nova_compute_services
  changed_when: false
  run_once: True
  delegate_to: "{{ groups['nova-api'][0] }}"
  retries: 20
  delay: 10
  until:
    - nova_compute_services is success
    # A list containing the 'Host' field of compute services that have
    # registered themselves.  Don't exclude compute services that are disabled
    # since these could have been explicitly disabled by the operator. While we
    # could exclude services that are down, the nova-manage cell_v2
    # discover_hosts does not do this so let's not block on it here.
    # NOTE(mgoddard): Cannot factor this out into an intermediary variable
    # before ansible 2.8, due to
    # https://bugs.launchpad.net/kolla-ansible/+bug/1835817.
    - (nova_compute_services.stdout |
       from_json |
       map(attribute='Host') |
       list)
      is superset(expected_compute_service_hosts)

# TODO(yoctozepto): no need to do --by-service if ironic not used
- name: Discover nova hosts
  become: true
  command: >
    docker exec nova_api nova-manage cell_v2 discover_hosts --by-service
  changed_when: False
  run_once: True
  delegate_to: "{{ groups['nova-api'][0] }}"

# NOTE(yoctozepto): SIGHUP is probably unnecessary
- name: Refresh cell cache in nova scheduler
  become: true
  command: docker kill --signal HUP nova_scheduler
  changed_when: False
  when:
    - inventory_hostname in groups['nova-scheduler']