46 lines
1.6 KiB
YAML
46 lines
1.6 KiB
YAML
---
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- name: Test host layout
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hosts: localhost
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become: true
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vars:
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storage_node_count: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
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expected_masters: [1, 1, 3, 3, 3, 3, 3, 5, 5, 5, 5, 7, 7, 7, 7, 9, 9, 9, 9, 11]
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tasks:
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# the elasticserch cluster elects one master from all those which are marked as master-eligible
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# 1 node cluster can only have one master
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# 2 node clusters have 1 master-eligable nodes to avoid split-brain
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# 3 node clusters have 3 master-eligable nodes
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# >3 node clusters have (nodes // 2) eligable masters rounded up to the next odd number
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- name: Master node count fact
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set_fact:
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master_node_count: |-
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{% set masters = 0 %}
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{% if (item | int) < 3 %}
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{% set masters = 1 %}
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{% elif (item | int) == 3 %}
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{% set masters = 3 %}
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{% else %}
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{% set masters = (item | int ) // 2 %}
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{% if ((masters | int) % 2 == 0) %}
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{% set masters = (masters | int) + 1 %}
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{% endif %}
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{% endif %}
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{{ masters }}
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with_items: "{{ storage_node_count }}"
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register: computed_masters
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- name: Gather results
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set_fact:
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masters: "{{ masters|default([]) + [ { 'nodes': item.item, 'masters': (item.ansible_facts.master_node_count|int) } ] }}"
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with_items: "{{ computed_masters.results }}"
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- name: Check results
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assert:
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that: item.0 == item.1.masters
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with_together:
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- "{{ expected_masters }}"
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- "{{ masters }}"
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