Ceph OSD auto classification

group_vars-all.yml

ceph_layouts:
  4HDD:
    devices:
      - /dev/sda
      - /dev/sdb
      - /dev/sdc
      - /dev/sdd
  '1SSD+4HDD':
    journal_size: 10000
    raw_multi_journal: true
    raw_journal_devices:
      - /dev/sda
      - /dev/sda
      - /dev/sda
      - /dev/sda
    devices:
      - /dev/sdb
      - /dev/sdc
      - /dev/sdd
      - /dev/sde
  1SSD:
    journal_collocation: true
    journal_size: 10000
    devices:
      - /dev/sda
  2SSD:
    journal_collocation: true
    journal_size: 10000
    devices:
      - /dev/sda
      - /dev/sdb

playbook.yml

- name: Install ceph osds
  hosts: "{{ osd_group_name }}"
  pre_tasks:
    - name: Set HDD count fact
      set_fact:
        hdd_count: "{{ ansible_devices | dictsort | selectattr('1.removable', 'equalto', '0') | map(attribute='1.rotational') | map('int') | sum }}"
      tags:
        - ceph
        - ceph-osd
        - ceph-osd-layout
    - name: Set SSD count fact
      set_fact:
        ssd_count: "{{ ansible_devices | dictsort | selectattr('1.removable', 'equalto', '0') | list | length - hdd_count | int }}"
      tags:
        - ceph
        - ceph-osd
        - ceph-osd-layout
    - name: Try to set layout automatically if none is specified
      set_fact:
        ceph_layout: "{% if ssd_count|int > 0 %}{{ ssd_count }}SSD{% endif %}{% if ssd_count|int > 0 and hdd_count|int > 0 %}+{% endif %}{% if hdd_count|int > 0 %}{{ hdd_count }}HDD{% endif %}"
      when: ceph_layout is not defined
      tags:
        - ceph
        - ceph-osd
        - ceph-osd-layout
    - name: Set host facts for specified ceph layout
      set_fact:
        journal_size: "{{ ceph_layouts[ceph_layout]['journal_size'] | default(omit) }}"
        journal_collocation: "{{ ceph_layouts[ceph_layout]['journal_collocation'] | default(omit) }}"
        devices: "{{ ceph_layouts[ceph_layout]['devices'] | default(omit) }}"
        raw_multi_journal: "{{ ceph_layouts[ceph_layout]['raw_multi_journal'] | default(omit) }}"
        raw_journal_devices: "{{ ceph_layouts[ceph_layout]['raw_journal_devices'] | default(omit) }}"
      when:
        - ceph_layout is defined
        - ceph_layouts[ceph_layout] is defined
        - ceph_autolayout_disable is not defined
      tags:
        - ceph
        - ceph-osd
        - ceph-osd-layout
  roles:
    - { role: "ceph-osd", tags: [ "ceph", "ceph-osd" ] }