rabbitmq_cluster.yml

---
# Copyright 2014, Rackspace US, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# The output of 'rabbitmqctl -q cluster_status' looks like this:
# [{nodes,[{disc,[rabbit@container1,rabbit@container2,rabbit@container3]}]},
#  {running_nodes,[rabbit@container3,rabbit@container1,rabbit@container2]},
#  {cluster_name,<<"rabbitmq_cluster1">>},
#  {partitions,[]},
#  {alarms,[{rabbit@container3,[]},
#           {rabbit@container1,[]},
#           {rabbit@container2,[]}]}]
#
# Our solution to get the cluster name out cleanly is inspired by
# https://unix.stackexchange.com/a/13472
- name: Get rabbitmq cluster name
  shell: |
    rabbitmqctl -q cluster_status | grep -oP '(?<={cluster_name,<<").*(?=">>})'
  args:
    executable: /bin/bash
  changed_when: false
  register: _cluster_name

- name: Set rabbitmq cluster name on primary node
  command: |
    rabbitmqctl set_cluster_name {{ rabbitmq_cluster_name }}
  when:
    - "ansible_hostname == rabbitmq_primary_cluster_node"
    - "_cluster_name.stdout != rabbitmq_cluster_name"

- name: Join cluster on secondary nodes
  include: rabbitmq_cluster_join.yml
  static: no
  when:
    - "ansible_hostname != rabbitmq_primary_cluster_node"
    - "_cluster_name.stdout != rabbitmq_cluster_name"