adds a new 'lvm_osds' osd scenario

This scenario will create OSDs using ceph-volume and is only available
in ceph releases greater than Luminous.

Signed-off-by: Andrew Schoen <aschoen@redhat.com>

roles/ceph-osd/defaults/main.yml

@@ -187,6 +187,19 @@ dedicated_devices: []
 # /dev/sdc1: PARTLABEL="ceph block.wal" PARTUUID="824b84ba-6777-4272-bbbd-bfe2a25cecf3"
 bluestore_wal_devices: "{{ dedicated_devices }}"
 
+# VII. Use ceph-volume to create OSDs from logical volumes.
+# Use 'lvm_osds:true' to enable this scenario. Currently we only support dedicated journals
+# when using lvm, not collocated journals.
+# lvm_volumes is a dictionary whose key/value pair represent a data lv and a journal pair.
+# Journals can be either a lv, device or partition. You can not use the same journal for many data lvs.
+# For example:
+# lvm_volumes:
+#   data-lv1: journal-lv1
+#   data-lv2: /dev/sda
+#   data:lv3: /dev/sdb1
+lvm_osds: false
+lvm_volumes: {}
+
 
 ##########
 # DOCKER #

roles/ceph-osd/tasks/check_mandatory_vars.yml

@@ -46,6 +46,26 @@
     - not osd_auto_discovery
     - devices|length == 0
 
+- name: verify lvm_volumes have been provided
+  fail:
+    msg: "please provide lvm_volumes to your osd scenario"
+  when:
+    - osd_group_name is defined
+    - osd_group_name in group_names
+    - lvm_osds
+    - not osd_auto_discovery
+    - lvm_volumes|length == 0
+
+- name: make sure the lvm_volumes variable is a dictionary
+  fail:
+    msg: "lvm_volumes: must be a dictionary"
+  when:
+    - osd_group_name is defined
+    - osd_group_name in group_names
+    - not osd_auto_discovery
+    - lvm_osds
+    - lvm_volumes is not mapping
+
 - name: make sure the devices variable is a list
   fail:
     msg: "devices: must be a list, not a string, i.e. [ \"/dev/sda\" ]"
@@ -87,3 +107,13 @@
     - not containerized_deployment
     - osd_objectstore == 'bluestore'
     - ceph_release_num.{{ ceph_release }} < ceph_release_num.luminous
+
+- name: check if lvm_osds is supported by the selected ceph version
+  fail:
+    msg: "lvm_osds is not supported by the selected Ceph version, use Luminous or above."
+  when:
+    - osd_group_name is defined
+    - osd_group_name in group_names
+    - not containerized_deployment
+    - lvm_osds
+    - ceph_release_num.{{ ceph_release }} < ceph_release_num.luminous

roles/ceph-osd/tasks/main.yml

@@ -20,6 +20,14 @@
   # Hard code this so we will skip the entire file instead of individual tasks (Default isn't Consistent)
   static: False
 
+- name: create lvm OSDs with ceph-volume
+  include: ./scenarios/lvm.yml
+  when:
+    - lvm_osds
+    - not containerized_deployment
+  # Hard code this so we will skip the entire file instead of individual tasks (Default isn't Consistent)
+  static: False
+
 - include: ./docker/main.yml
   when: containerized_deployment
   # Hard code this so we will skip the entire file instead of individual tasks (Default isn't Consistent)

roles/ceph-osd/tasks/scenarios/lvm.yml

@@ -0,0 +1,5 @@
+---
+
+- name: use ceph-volume to create filestore OSDs with dedicated journals
+  command: "ceph-volume lvm create --filestore --data {{ item.key }} --journal {{ item.value }}"
+  with_dict: "{{ lvm_volumes }}"