openstack-ansible-ops/elk_metrics_7x/roles/elastic_data_hosts/vars/data-node-variables.yml

---
# Copyright 2018, 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.

# storage node count is equal to the cluster size
storage_node_count: "{{ groups['elastic'] | length }}"

# the elasticsearch cluster elects one master from all those which are marked as master-eligible
# 1 node cluster can only have one master
# 2 node clusters have 1 master-eligible nodes to avoid split-brain
# 3 node clusters have 3 master-eligible nodes
# >3 node clusters have (nodes // 2) eligable masters rounded up to the next odd number
elastic_master_node_count: |-
  {% set masters = 0 %}
  {% if (storage_node_count | int) < 3 %}
  {%   set masters = 1 %}
  {% elif (storage_node_count | int) == 3 %}
  {%   set masters = 3 %}
  {% else %}
  {%   set masters = (storage_node_count | int ) // 2 %}
  {%   if ((masters | int) % 2 == 0) %}
  {%     set masters = (masters | int) + 1 %}
  {%   endif %}
  {% endif %}
  {{ masters }}

## Assign node roles
# By default, let all elastic cluster nodes be data unless overridden using elasticsearch_node_data: false
data_nodes: |-
  {% set nodes = [] %}
  {% for node in groups['elastic'] %}
  {%   if not ((hostvars[node]['elasticsearch_node_data'] is defined) and (not (hostvars[node]['elasticsearch_node_data'] | bool))) %}
  {%     set _ = nodes.append(node) %}
  {%   endif %}
  {% endfor %}
  {{ nodes }}

# By default, let all elastic cluster nodes be ingest unless overridden using elasticsearch_node_ingest: false
ingest_nodes: |-
  {% set nodes = [] %}
  {% for node in groups['elastic'] %}
  {%   if not ((hostvars[node]['elasticsearch_node_ingest'] is defined) and (not (hostvars[node]['elasticsearch_node_ingest'] | bool))) %}
  {%     set _ = nodes.append(node) %}
  {%   endif %}
  {% endfor %}
  {{ nodes }}

## While the master node group is dynamically chosen the override
## `elasticsearch_node_master` can be used to override the node type.
## Dynamic node inclusion will still work for all other nodes in the group.
_master_nodes: "{{ groups['elastic'][:elastic_master_node_count | int] }}"
master_nodes: |-
  {% set nodes = [] %}
  {% for node in groups['elastic'] %}
  {%   if (nodes | length) <= (elastic_master_node_count | int) %}
  {%     if (hostvars[node]['elasticsearch_node_master'] is defined) and (hostvars[node]['elasticsearch_node_master'] | bool) and (node not in nodes) %}
  {%       set _ = nodes.append(node) %}
  {%     endif %}
  {%   endif %}
  {% endfor %}
  {% for node in groups['elastic'] %}
  {%   if (nodes | length) <= (elastic_master_node_count | int) %}
  {%     if (node in _master_nodes) and (node not in nodes) %}
  {%       set _ = nodes.append(node) %}
  {%     endif %}
  {%   endif %}
  {% endfor %}
  {{ nodes | unique }}
master_node_count: "{{ master_nodes | length }}"

coordination_nodes: |-
  {% if (groups['kibana'] | length) > 0 %}
  {%   set c_nodes = groups['kibana'] %}
  {% else %}
  {%   set c_nodes = groups['elastic'] %}
  {% endif %}
  {{
    (elasticsearch_coordination_node_socket_addresses
      | default((c_nodes | map('extract', hostvars, 'ansible_host'))
                 | map('regex_replace', '^(.*)$' ,'\1:' ~ elastic_port) | list))
  }}

_elasticsearch_discovery_seed_hosts: >-
  {{
    elasticsearch_discovery_seed_hosts
      | default((groups['elastic'] | union(groups['kibana'])) | map('extract', hostvars, 'ansible_host') | list)
  }}

elasticsearch_interface_speed: |-
  {% set default_interface_fact = hostvars[inventory_hostname]['ansible_' + (elastic_data_interface | replace('-', '_'))] %}
  {% set speeds = [] %}
  {% if default_interface_fact['type'] == 'bridge' %}
  {%   for interface in default_interface_fact['interfaces'] %}
  {%     set interface_fact = hostvars[inventory_hostname]['ansible_' + (interface | replace('-', '_'))] %}
  {%     if 'speed' in interface_fact %}
  {%       set speed = (interface_fact['speed'] | default(1000)) | string %}
  {%       if speed == "-1" %}
  {%         set _ = speeds.append(1000) %}
  {%       else %}
  {%         set _ = speeds.append(speed | int) %}
  {%       endif %}
  {%       if 'module' in interface_fact %}
  {%         set _ = speeds.append((interface_fact['speed'] | default(1000)) | int) %}
  {%       else %}
  {%         set _ = speeds.append(1000) %}
  {%       endif %}
  {%     endif %}
  {%   endfor %}
  {% else %}
  {%   if ('module' in default_interface_fact) or (default_interface_fact['type'] == 'bond') %}
  {%     set speed = (default_interface_fact['speed'] | default(1000)) | string %}
  {%     if speed == "-1" %}
  {%       set _ = speeds.append(1000) %}
  {%     else %}
  {%       set _ = speeds.append(speed | int) %}
  {%     endif %}
  {%   else %}
  {%     set _ = speeds.append(1000) %}
  {%   endif %}
  {% endif %}
  {% set interface_speed = ((speeds | min) * 0.20) | int %}
  {{ ((interface_speed | int) > 750) | ternary(750, interface_speed) }}

# IP addresses for the elasticsearch data nodes
# Override using elasticsearch_data_node_socket_addresses
# to use a non-default (non-ansible) interface for elasticsearch
elasticsearch_data_node_details: >-
  {{
      elasticsearch_data_node_socket_addresses
      | default((data_nodes | map('extract', hostvars, 'ansible_host'))
                 | map('regex_replace', '^(.*)$' ,'\1:' ~ elastic_port) | list)
  }}

# IP addresses for the logstash data nodes
# Override using logstash_data_node_socket_addresses
# to use a non-default (non-ansible) interface for logstash
logstash_data_node_details: >-
  {{
     logstash_data_node_socket_addresses
     | default((groups['logstash'] | map('extract', hostvars, 'ansible_host'))
                | map('regex_replace', '^(.*)$' ,'\1:' ~ logstash_beat_input_port) | list)
  }}


# based on the assignment of roles to hosts, set per host booleans
master_node: "{{ (inventory_hostname in master_nodes) | ternary(true, false) }}"
data_node: "{{ (inventory_hostname in data_nodes) | ternary(true, false) }}"

elastic_processors_floor: "{{ ((ansible_processor_count | int) - 1) }}"
elastic_processors_floor_set: "{{ ((elastic_processors_floor | int) > 0) | ternary(elastic_processors_floor, 1) }}"
elastic_thread_pool_size: "{{ ((ansible_processor_count | int) >= 24) | ternary(23, elastic_processors_floor_set) }}"

# Set a data node facts. The data nodes, in the case of elasticsearch are also
# ingest nodes.
elasticsearch_number_of_replicas: "{{ ((data_nodes | length) > 2) | ternary('2', ((data_nodes | length) > 1) | ternary('1', '0')) }}"

# Input data for the beat config templates
elasticsearch_beat_settings:
  number_of_replicas: "{{ elasticsearch_number_of_replicas }}"
  max_docvalue_fields_search: "{{ elastic_max_docvalue_fields_search | default('100') }}"
  shard_count: "{{ elastic_primary_shard_count | default(elasticsearch_data_node_details | length) }}"

# Shuffled elasticsearch endpoints (with localhost if relevant) for use in beat config files
elasticsearch_data_hosts: |-
  {% set data_hosts = elasticsearch_data_node_details | shuffle(seed=inventory_hostname) %}
  {% if inventory_hostname in data_nodes %}
  {%   set _ = data_hosts.insert(0, '127.0.0.1:' ~ elastic_port) %}
  {% endif %}
  {{ data_hosts }}

# Shuffled logstash endpoints (with localhost if relevant) for use in beat config files
logstash_data_hosts: |-
  {% set data_hosts = logstash_data_node_details | shuffle(seed=inventory_hostname) %}
  {% if inventory_hostname in groups['logstash'] %}
  {%   set _ = data_hosts.insert(0, '127.0.0.1:' ~ logstash_beat_input_port) %}
  {% endif %}
  {{ data_hosts }}