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

149 lines
4.8 KiB
YAML

---
# This playbook shrinks the Ceph monitors from your cluster
# It can remove any number of monitor(s) from the cluster and ALL THEIR DATA
#
# Use it like this:
# ansible-playbook shrink-mon.yml -e mon_host=ceph-mon01,ceph-mon02
# 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-cluster.yml
# Overrides the prompt using -e option. Can be used in
# automation scripts to avoid interactive prompt.
- name: confirm whether user really meant to remove monitor(s) from the ceph cluster
hosts:
- localhost
gather_facts: false
become: true
vars_prompt:
- name: ireallymeanit
prompt: Are you sure you want to shrink the cluster?
default: 'no'
private: no
tasks:
- include_vars: roles/ceph-defaults/defaults/main.yml
- include_vars: group_vars/all.yml
- name: exit playbook, if only one monitor is present in cluster
fail:
msg: "You are about to shrink the only monitor present in the cluster.
If you really want to do that, please use the purge-cluster playbook."
when: "{{ groups[mon_group_name] | length | int == 1 }}"
- name: exit playbook, if user did not mean to shrink cluster
fail:
msg: "Exiting shrink-mon playbook, no monitor(s) was/were 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: exit playbook, if no monitor(s) was/were given
fail:
msg: "mon_host must be declared
Exiting shrink-cluster playbook, no monitor(s) was/were removed.
On the command line when invoking the playbook, you can use
-e mon_host=ceph-mon01,ceph-mon02 argument."
when: mon_host is not defined
- name: test if ceph command exist
command: command -v ceph
changed_when: false
failed_when: false
register: ceph_command
- name: exit playbook, if ceph command does not exist
debug:
msg: "The ceph command is not available, please install it :("
run_once: true
when:
- ceph_command.rc != 0
- name: exit playbook, if cluster files do not exist
stat:
path: "{{ item }}"
register: ceph_conf_key
with_items:
- /etc/ceph/{{ cluster }}.conf
- /etc/ceph/{{ cluster }}.client.admin.keyring
failed_when: false
- fail:
msg: "Ceph's configuration file is not present in /etc/ceph"
with_items: "{{ceph_conf_key.results}}"
when:
- item.stat.exists == false
- name: exit playbook, if can not connect to the cluster
command: timeout 5 ceph --cluster {{ cluster }} health
register: ceph_health
until: ceph_health.stdout.find("HEALTH") > -1
retries: 5
delay: 2
- name: verify given monitors are reachable
command: ping -c 1 {{ item }}
with_items: "{{mon_host.split(',')}}"
register: mon_reachable
failed_when: false
- fail:
msg: "One or more monitors are not reachable, please check your /etc/hosts or your DNS"
with_items: "{{mon_reachable.results}}"
when:
- item.rc != 0
- name: stop monitor service
service:
name: ceph-mon@{{ item }}
state: stopped
enabled: no
with_items: "{{mon_host.split(',')}}"
delegate_to: "{{item}}"
failed_when: false
- name: purge monitor store
file:
path: /var/lib/ceph/mon/{{ cluster }}-{{ item }}
state: absent
with_items: "{{mon_host.split(',')}}"
delegate_to: "{{item}}"
- name: remove monitor from the quorum
command: ceph --cluster {{ cluster }} mon remove {{ item }}
failed_when: false
with_items: "{{mon_host.split(',')}}"
# NOTE (leseb): sorry for the 'sleep' command
# but it will take a couple of seconds for other monitors
# to notice that one member has left.
# 'sleep 5' is not that bad and should be sufficient
- name: verify the monitor is out of the cluster
shell: "sleep 5 && ceph --cluster {{ cluster }} -s | grep monmap | sed 's/.*quorum//' | egrep -sq {{ item }}"
with_items: "{{mon_host.split(',')}}"
failed_when: false
register: ceph_health_mon
- name: please remove the monitor from your ceph configuration file
debug:
msg: "The monitor(s) has/have been successfully removed from the cluster.
Please remove the monitor(s) entry(ies) from the rest of your ceph configuration files, cluster wide."
run_once: true
with_items: "{{ceph_health_mon.results}}"
when:
- item.rc != 0
- name: please remove the monitor from your ceph configuration file
fail:
msg: "Monitor(s) appear(s) to still be part of the cluster, please check what happened."
run_once: true
with_items: "{{ceph_health_mon.results}}"
when:
- item.rc == 0