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

---
# This playbook shrinks the Ceph RGW from your cluster
#
# Use it like this:
# ansible-playbook shrink-rgw.yml -e rgw_to_kill=ceph-rgw01
#     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-rgw.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') }}"
    - "{{ rgw_group_name | default('rgws') }}"
  become: true
  tasks:
    - debug:
        msg: gather facts on MONS and RGWs

- name: confirm whether user really meant to remove rgw from the ceph cluster
  hosts: localhost
  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

    - name: exit playbook, if no rgw was given
      when: rgw_to_kill is not defined
      fail:
        msg: >
          rgw_to_kill must be declared.
          Exiting shrink-cluster playbook, no RGW was removed. On the command
          line when invoking the playbook, you can use
          "-e rgw_to_kill=ceph-rgw0 argument".  You can only remove a single
          RGW each time the playbook runs.

    - name: get rgw hostname
      set_fact:
        rgw_to_kill_hostname: "{{ rgw_to_kill.split('.')[0] }}"

    - name: get rgw instance
      set_fact:
        rgw_to_kill_instance: "{{ rgw_to_kill.split('.')[1] }}"

    - name: exit if supplied hostname didnt match actual hostname
      fail:
        msg: supplied hostname didn't match with actual hostname
      when: hostvars[rgw_to_kill_hostname]['ansible_hostname'] != rgw_to_kill_hostname

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

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

    - name: set_fact container_exec_cmd for mon0
      when: containerized_deployment | bool
      set_fact:
        container_exec_cmd: "{{ container_binary }} exec ceph-mon-{{hostvars[groups[mon_group_name][0]]['ansible_hostname'] }}"

    - name: exit playbook, if can not connect to the cluster
      command: "{{ container_exec_cmd | default('') }} timeout 5 ceph --cluster {{ cluster }} health"
      register: ceph_health
      until: ceph_health is succeeded
      delegate_to: "{{ groups[mon_group_name][0] }}"
      retries: 5
      delay: 2

  tasks:
    - name: stop rgw service and verify it
      block:
        - name: stop rgw service
          service:
            name: ceph-radosgw@rgw.{{ rgw_to_kill }}
            state: stopped
            enabled: no
          delegate_to: "{{ rgw_to_kill_hostname }}"
          failed_when: false

        - name: ensure that the rgw is stopped
          command: "systemctl is-active ceph_rgw@rgw.{{ rgw_to_kill }}"
          register: rgw_to_kill_status
          failed_when: rgw_to_kill_status.rc == 0
          delegate_to: "{{ rgw_to_kill_hostname }}"
          retries: 5
          delay: 2

    - name: exit if rgw_to_kill is reported in ceph status
      command: "{{ container_exec_cmd | default('') }} ceph --cluster {{ cluster }} -s -f json"
      register: ceph_status
      delegate_to: "{{ groups[mon_group_name][0] }}"
      failed_when:
        - (ceph_status.stdout | from_json).servicemap.services.rgw is defined
        - rgw_to_kill in (ceph_status.stdout | from_json).servicemap.services.rgw.daemons.keys() | list
      until:
        - (ceph_status.stdout | from_json).servicemap.services.rgw is defined
        - rgw_to_kill not in (ceph_status.stdout | from_json).servicemap.services.rgw.daemons.keys() | list
      retries: 3
      delay: 3

    - name: purge directories related to rgw
      file:
        path: /var/lib/ceph/radosgw/{{ cluster }}-{{ rgw_to_kill_hostname }}
        state: absent
      delegate_to: "{{ rgw_to_kill_hostname }}"

  post_tasks:
    - name: show ceph health
      command: "{{ container_exec_cmd | default('')}} ceph --cluster {{ cluster }} -s"
      delegate_to: "{{ groups[mon_group_name][0] }}"