ceph-ansible/infrastructure-playbooks/shrink-rbdmirror.yml

---
# This playbook removes the Ceph RBD mirror from your cluster on the given
# node.
#
# Use it like this:
# ansible-playbook shrink-rbdmirror.yml -e rbdmirror_to_kill=ceph-rbdmirror01
#     Prompts for confirmation to shrink, defaults to no and
#     doesn't shrink the cluster. yes shrinks the cluster.
#
# ansible-playbook -e ireallymeanit=yes|no shrink-rbdmirror.yml
#     Overrides the prompt using -e option. Can be used in
#     automation scripts to avoid interactive prompt.

- name: gather facts and check the init system
  hosts:
    - "{{ mon_group_name|default('mons') }}"
    - "{{ mon_group_name|default('rbdmirrors') }}"
  become: true
  tasks:
    - debug:
        msg: gather facts on MONs and RBD mirrors

- name: confirm whether user really meant to remove rbd mirror from the ceph
        cluster
  hosts: "{{ groups[mon_group_name][0] }}"
  become: true
  vars_prompt:
    - name: ireallymeanit
      prompt: Are you sure you want to shrink the cluster?
      default: 'no'
      private: no
  pre_tasks:
    - import_role:
        name: ceph-defaults

    - import_role:
        name: ceph-facts
        tasks_from: container_binary

    - name: exit playbook, if no rbdmirror was given
      fail:
        msg: "rbdmirror_to_kill must be declared
          Exiting shrink-cluster playbook, no RBD mirror was removed.
          On the command line when invoking the playbook, you can use
          -e rbdmirror_to_kill=rbd-mirror01 argument. You can only remove a
          single rbd mirror each time the playbook runs."
      when: rbdmirror_to_kill is not defined

    - name: exit playbook, if the rbdmirror is not part of the inventory
      fail:
        msg: >
            It seems that the host given is not part of your inventory,
            please make sure it is.
      when: rbdmirror_to_kill not in groups[rbdmirror_group_name]

    - name: exit playbook, if user did not mean to shrink cluster
      fail:
        msg: "Exiting shrink-rbdmirror playbook, no rbd-mirror was removed.
           To shrink the cluster, either say 'yes' on the prompt or
           or use `-e ireallymeanit=yes` on the command line when
           invoking the playbook"
      when: ireallymeanit != 'yes'

    - name: set_fact container_exec_cmd for mon0
      when: containerized_deployment | bool
      set_fact:
        container_exec_cmd: "{{ container_binary }} exec ceph-mon-{{ ansible_hostname }}"

    - name: exit playbook, if can not connect to the cluster
      command: "{{ container_exec_cmd | default('') }} timeout 5 ceph --cluster {{ cluster }} service dump -f json"
      register: ceph_health
      until: ceph_health is succeeded
      retries: 5
      delay: 2

    - name: set_fact rbdmirror_to_kill_hostname
      set_fact:
        rbdmirror_to_kill_hostname: "{{ hostvars[rbdmirror_to_kill]['ansible_hostname'] }}"

    - name: set_fact rbdmirror_gids
      set_fact:
        rbdmirror_gids: "{{ rbdmirror_gids | default([]) + [ item ] }}"
      with_items: "{{  (ceph_health.stdout | from_json)['services']['rbd-mirror']['daemons'].keys() | list }}"
      when: item != 'summary'

    - name: set_fact rbdmirror_to_kill_gid
      set_fact:
        rbdmirror_to_kill_gid: "{{ (ceph_health.stdout | from_json)['services']['rbd-mirror']['daemons'][item]['gid'] }}"
      with_items: "{{ rbdmirror_gids }}"
      when: (ceph_health.stdout | from_json)['services']['rbd-mirror']['daemons'][item]['metadata']['id'] == rbdmirror_to_kill_hostname

  tasks:
    - name: stop rbdmirror service
      service:
        name: ceph-rbd-mirror@rbd-mirror.{{ rbdmirror_to_kill_hostname }}
        state: stopped
        enabled: no
      delegate_to: "{{ rbdmirror_to_kill }}"
      failed_when: false

    - name: purge related directories
      file:
        path: /var/lib/ceph/bootstrap-rbd-mirror/{{ cluster }}-{{ rbdmirror_to_kill_hostname }}
        state: absent
      delegate_to: "{{ rbdmirror_to_kill }}"

  post_tasks:
    - name: get servicemap details
      command: "{{ container_exec_cmd | default('') }} timeout 5 ceph --cluster {{ cluster }} service dump -f json"
      register: ceph_health
      failed_when:
        - "'rbd-mirror' in (ceph_health.stdout | from_json)['services'].keys() | list"
        - rbdmirror_to_kill_gid in (ceph_health.stdout | from_json)['services']['rbd-mirror']['daemons'].keys() | list
      until:
        - "'rbd-mirror' in (ceph_health.stdout | from_json)['services'].keys() | list"
        - rbdmirror_to_kill_gid not in (ceph_health.stdout | from_json)['services']['rbd-mirror']['daemons'].keys() | list
      when: rbdmirror_to_kill_gid is defined
      retries: 12
      delay: 10

    - name: show ceph health
      command: "{{ container_exec_cmd | default('') }} ceph --cluster {{ cluster }} -s"