Add a check before wiping Ceph disks in bootstrap

An unwitting user may apply the KOLLA_CEPH_OSD[_CACHE]_BOOTSTRAP label
to a partition assuming it will only use that partition for Ceph, and
end up wiping out their disk.

This change adds a layer of checking to this scenario to try and help
avoid a disaster scenario.

Closes-Bug: 1599103
DocImpact

Change-Id: Ibb9fb42f87a76bc02165ec0b93b60234bad8747a

ansible/group_vars/all.yml

@@ -322,6 +322,10 @@ ceph_cache_mode: "writeback"
 # Valid options are [ ext4, btrfs, xfs ]
 ceph_osd_filesystem: "xfs"
 
+# Set to 'yes-i-really-really-mean-it' to force wipe disks with existing partitions for OSDs. Only
+# set if you understand the consequences!
+ceph_osd_wipe_disk: ""
+
 # These are /etc/fstab options. Comma separated, no spaces (see fstab(8))
 ceph_osd_mount_options: "defaults,noatime"
 

ansible/roles/ceph/tasks/bootstrap_osds.yml

@@ -23,6 +23,21 @@
   set_fact:
     osds_cache_bootstrap: "{{ (osd_cache_lookup.stdout.split('localhost | SUCCESS => ')[1]|from_json).disks|from_json }}"
 
+- pause:
+    prompt: |
+     WARNING: It seems {{ item.device }} is marked to be wiped and partitioned for Ceph data and
+              a co-located journal, but appears to contain other existing partitions (>1).
+
+              If you are sure you want this disk to be *wiped* for use with Ceph, press enter.
+
+              Otherwise, press Ctrl-C, then 'A'. (You can disable this check by setting
+              ceph_osd_wipe_disk: 'yes-i-really-really-mean-it' within globals.yml)
+  with_items: "{{ osds_bootstrap|default([]) }}"
+  when:
+    - item.external_journal | bool == False
+    - ansible_devices[item.device.split('/')[2]].partitions|count > 1
+    - ceph_osd_wipe_disk != "yes-i-really-really-mean-it"
+
 - name: Bootstrapping Ceph OSDs
   kolla_docker:
     action: "start_container"
@@ -54,6 +69,21 @@
       - "kolla_logs:/var/log/kolla/"
   with_indexed_items: "{{ osds_bootstrap|default([]) }}"
 
+- pause:
+    prompt: |
+     WARNING: It seems {{ item.device }} is marked to be wiped and partitioned for Ceph data and
+              a co-located journal, but appears to contain other existing partitions (>1).
+
+              If you are sure you want this disk to be *wiped* for use with Ceph, press enter.
+
+              Otherwise, press Ctrl-C, then 'A'. (You can disable this check by setting
+              ceph_osd_wipe_disk: 'yes-i-really-really-mean-it' within globals.yml)
+  with_items: "{{ osds_cache_bootstrap|default([]) }}"
+  when:
+    - item.external_journal | bool == False
+    - ansible_devices[item.device.split('/')[2]].partitions|count > 1
+    - ceph_osd_wipe_disk != "yes-i-really-really-mean-it"
+
 - name: Bootstrapping Ceph Cache OSDs
   kolla_docker:
     action: "start_container"

releasenotes/notes/add-ceph-disk-init-protection-5b38ce8f1502ff69.yaml

@@ -0,0 +1,20 @@
+---
+prelude: >
+    There any multiple options available to an operator
+    with regards to how they wish to provision devices
+    for use with Ceph OSDs. One of those is to co-locate
+    the data and journal on a disk, which is done by
+    marking a partition on that disk with
+    `KOLLA_CEPH_OSD[_CACHE]_BOOTSTRAP`.
+    If an unwitting user happened to confuse this with
+    the partition based approach, they could wipe out
+    their entire disk, resulting in data loss.
+features:
+  - The Ceph bootstrap will now pause requesting
+    confirmation from the operator if it detects a
+    bootstrap label on a disk with more than one
+    partition.
+    An operator may override this behaviour by
+    setting the Ansible variable
+    'ceph_osd_wipe_disk' to
+    'yes-i-really-really-mean-it'.