ceph-ansible/roles/ceph-mon/tasks/crush_rules.yml

---
- name: configure crush hierarchy
  ceph_crush:
    cluster: "{{ cluster }}"
    location: "{{ hostvars[item]['osd_crush_location'] }}"
    containerized: "{{ container_exec_cmd }}"
  with_items: "{{ groups[osd_group_name] }}"
  register: config_crush_hierarchy
  when:
    - inventory_hostname == groups.get(mon_group_name) | last
    - create_crush_tree | bool
    - hostvars[item]['osd_crush_location'] is defined

- name: create configured crush rules
  command: "{{ container_exec_cmd }} ceph --cluster {{ cluster }} osd crush rule create-simple {{ item.name }} {{ item.root }} {{ item.type }}"
  with_items: "{{ crush_rules | unique }}"
  changed_when: false
  when: inventory_hostname == groups.get(mon_group_name) | last

- name: get id for new default crush rule
  command: "{{ container_exec_cmd }} ceph --cluster {{ cluster }} osd -f json crush rule dump {{ item.name }}"
  register: info_ceph_default_crush_rule
  changed_when: false
  with_items: "{{ crush_rules }}"
  when:
    - inventory_hostname == groups.get(mon_group_name) | last
    - item.default

# If multiple rules are set as default (should not be) then the last one is taken as actual default.
# the with_items statement overrides each iteration with the new one.
# NOTE(leseb): we should actually fail if multiple rules are set as default
- name: set_fact info_ceph_default_crush_rule_yaml
  set_fact:
    info_ceph_default_crush_rule_yaml: "{{ item.stdout | from_json() }}"
  with_items: "{{ info_ceph_default_crush_rule.results }}"
  when:
    - inventory_hostname == groups.get(mon_group_name) | last
    - not item.get('skipped', false)

- name: insert new default crush rule into daemon to prevent restart
  command: "{{ hostvars[item]['container_exec_cmd'] | default('') }} ceph --admin-daemon /var/run/ceph/{{ cluster }}-mon.{{ hostvars[item]['monitor_name'] }}.asok config set osd_pool_default_crush_rule {{ info_ceph_default_crush_rule_yaml.rule_id }}"
  changed_when: false
  delegate_to: "{{ item }}"
  with_items: "{{ groups[mon_group_name] }}"
  when:
    - not config_crush_hierarchy.get('skipped', false)
    - info_ceph_default_crush_rule_yaml | default('') | length > 0

- name: "add new default crush rule to {{ cluster }}.conf"
  ini_file:
    dest: "/etc/ceph/{{ cluster }}.conf"
    section: "global"
    option: "osd pool default crush rule"
    value: "{{ info_ceph_default_crush_rule_yaml.rule_id }}"
  delegate_to: "{{ item }}"
  with_items: "{{ groups[mon_group_name] }}"
  when:
    - not config_crush_hierarchy.get('skipped', false)
    - info_ceph_default_crush_rule_yaml | default('') | length > 0