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

---
- name: create roots needed for configured crush rules
  command: "{{ docker_exec_cmd }} ceph --cluster {{ cluster }} osd crush add-bucket {{ item.root }} root"
  with_items: "{{ crush_rules | unique }}"
  changed_when: false
  failed_when: false
  run_once: true

- name: create configured crush rules
  command: "{{ docker_exec_cmd }} ceph --cluster {{ cluster }} osd crush rule create-simple {{ item.name }} {{ item.root }} {{ item.type }}"
  with_items: "{{ crush_rules | unique }}"
  changed_when: false
  failed_when: false
  run_once: true

- name: get id for new default crush rule
  command: "{{ docker_exec_cmd }} ceph --cluster {{ cluster }} osd -f json crush rule dump {{ item.name }}"
  register: info_ceph_default_crush_rule
  changed_when: false
  failed_when: false
  with_items: "{{ crush_rules }}"
  when: item.default

- name: set_fact info_ceph_default_crush_rule_yaml
  set_fact:
    info_ceph_default_crush_rule_yaml: "{{ info_ceph_default_crush_rule.results[0].stdout|from_json() }}"
  when: info_ceph_default_crush_rule.results|length > 0

- name: insert new default crush rule into daemon to prevent restart
  command: "{{ docker_exec_cmd }} ceph --cluster {{ cluster }} daemon mon.{{ monitor_name }} config set osd_pool_default_crush_replicated_ruleset {{ info_ceph_default_crush_rule_yaml.rule_id }}"
  changed_when: false
  failed_when: false
  when: info_ceph_default_crush_rule.results|length > 0

- name: add new default crush rule to ceph.conf
  ini_file:
    dest: "/etc/ceph/{{ cluster }}.conf"
    section: "global"
    option: "osd pool default crush replicated ruleset"
    value: "{{ info_ceph_default_crush_rule_yaml.rule_id }}"
  when: info_ceph_default_crush_rule.results|length > 0

- name: move rbd pool to new default root
  command: "{{ docker_exec_cmd }} ceph --cluster {{ cluster }} osd pool set rbd crush_ruleset {{ info_ceph_default_crush_rule_yaml.rule_id }}"
  changed_when: false
  failed_when: false
  run_once: true
  when: info_ceph_default_crush_rule.results|length > 0