roles/juju-compute-setup/tasks/main.yml

---
# roles/juju-compute-setup/main/tasks.yml

# Code for this is in library/juju_facts.py
- name: Obtain Juju Facts for creating machines
  juju_facts:

# For setwise operations on desired vs Juju state:
# list of active juju_machines names: juju_machines.keys()
# list of active juju_services names: juju_services.keys()

- name: Add machines to Juju
  command: "juju add-machine ssh:{{ item }}"
  with_items: "{{ groups['compute'] | difference( juju_machines.keys() ) }}"

# run this again, so machines will be in the juju_machines list
- name: Obtain Juju Facts after machine creation
  juju_facts:

- name: Deploy nova-compute service if needed
  command: "juju deploy {{ charm_versions[item] | default(item) }} --to {{ juju_machines[groups['compute'][0]]['machine_id'] }} --config={{ juju_config_path }}"
  with_items: 
    - "nova-compute"
  when: '"nova-compute" not in juju_services.keys()'

- name: Create relations between nova-compute and other services if needed
  command: "juju add-relation '{{ item.0.name }}' '{{ item.1 }}'"
  register: juju_relation
  failed_when: "juju_relation|failed and 'relation already exists' not in juju_relation.stderr"
  with_subelements:
    - "{{ compute_relations }}"
    - relations

# run another time
- name: Obtain Juju Facts after deploying nova-compute
  juju_facts:
  when: '"nova-compute" not in juju_services.keys()'

- name: Add more nova-compute units
  command: "juju add-unit nova-compute --to {{ juju_machines[item]['machine_id'] }}"
  with_items: "{{ groups['compute'] | difference( juju_compute_nodes.keys() ) }}"

- name: Pause to let Juju settle
  pause:
    prompt="Waiting for Juju..."
    seconds=20

# 160*15s = 2400s = 40m max wait
- name: Wait for nova-compute nodes to come online
  juju_facts:
  until: item in juju_compute_nodes.keys() and juju_compute_nodes[item]['workload-status']['message'] == "Unit is ready"
  retries: 160
  delay: 15
  with_items: "{{ groups['compute'] }}"

- name: verify that the nodes appear in nova
  action: shell bash -c "source ~/admin-openrc.sh; nova hypervisor-list | grep '{{ item }}'"
  register: result
  until: result | success
  retries: 5
  delay: 5
  with_items: "{{ groups['compute'] }}"