---
# Copyright 2016, 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.

- name: Gather facts
  hosts: "all"
  user: root
  gather_facts: true

# NOTE(mancdaz): rabbitmq cannot be upgraded in serial, so when
# rabbitmq_upgrade=True, serial is set to 0, else it is 1 for installs
- name: Install RabbitMQ server
  hosts: "{{ rabbitmq_host_group }}"
  serial: "{{ rabbitmq_upgrade|default(false) | bool | ternary(0, 1)}}"
  user: root
  gather_facts: True
  roles:
    - role: rabbitmq_server
  vars_files:
    - test-vars.yml

---
# Copyright 2016, 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.

- name: Gather facts
  hosts: "all"
  user: root
  gather_facts: true

# The cluster must be stopped when doing major/minor upgrades
# http://www.rabbitmq.com/clustering.html#upgrading
- name: Stop RabbitMQ nodes that are not the upgrader
  hosts: rabbitmq_all[1:]
  serial: 1
  max_fail_percentage: 0
  user: root
  tasks:
    - name: "Stop RabbitMQ"
      service:
        name: "rabbitmq-server"
        state: "stopped"
      when: rabbitmq_upgrade | default(false) | bool

- name: Install RabbitMQ server
  hosts: "{{ rabbitmq_host_group }}"
  serial: 1
  user: root
  gather_facts: True
  roles:
    - role: rabbitmq_server
  vars_files:
    - test-vars.yml

Stop all but one RabbitMQ node prior to upgrade
Stop all but one RabbitMQ node prior to upgrade

RabbitMQ nodes must all be stopped prior to a major/minor version
upgrade [1]. The role does this by distinguishing between the upgrader
node and the rest in separate stop and start tasks.

Upgrades can fail when more than one member of rabbitmq_all are not
members of the cluster. This is due to a bug fixed for greenfield
deployments by 5dc67955f0ac08a7c9719d641e9828558620da89. The same fix
was not applied to upgrades because major/minor upgrades require all
RabbitMQ nodes to be stopped which is incompatible with serialising the
role in isolation.

This change uses a play to stop all but one of the nodes, prior to
running the rabbitmq_server role, and then serialises the running of
the role so that one node is upgraded at a time. This minimises the
downtime as much as possible while allowing the role to be applied to
one node at a time.

[1] http://www.rabbitmq.com/clustering.html#upgrading

Change-Id: Icca5cb1a96f83063223b6ddbeb02eeb562b0931b
