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Accepted
Sheridan
Asked:2020-09-07 20:43:23 +0000 UTC2020-09-07 20:43:23 +0000 UTC

如何选择具有相同变量值的第一台主机？

  • 772

主机文件有这个部分：

[postgresql]
pg-alpha-01 postgresql_instance=alpha
pg-alpha-02 postgresql_instance=alpha
pg-beta-a   postgresql_instance=beta
pg-beta-b   postgresql_instance=beta
pg-beta-c   postgresql_instance=beta

在这些主机上，初始化了 postgresql 主从，在初始化过程中，我需要postgresql_instance选择一个组主机（具有相同的 ）作为主机。而且由于它是什么主机并不重要，让它成为列表中的第一个。

ansible

1 个回答

  1. Best Answer

    起初我只是想问一个问题，但我认为不先自己工作是不尊重的。最后一切都解决了。

    剧本：

    ---
  - hosts: postgresql
    gather_facts: no
    tasks:
    - name: Search first host
      set_fact:
        f_init_master_host: "{{ v_init_master_host }}"
        f_init_master_host_is_current_host: "{{ v_init_master_host == inventory_hostname }}"
      vars:
        v_init_master_host: "{{ groups['postgresql'] | map('extract', hostvars) | selectattr('postgresql_instance', 'equalto', postgresql_instance) | map(attribute='inventory_hostname') | list | first }}"

    - debug:
        msg: "First host for {{ inventory_hostname }}: {{ f_init_master_host }}"

    - debug:
        msg: "Current host is master: {{ f_init_master_host_is_current_host }}"

    结果：

    TASK [debug] ************
ok: [pg-alpha-01] => 
  msg: 'First host for pg-alpha-01: pg-alpha-01'
ok: [pg-alpha-02] => 
  msg: 'First host for pg-alpha-02: pg-alpha-01'
ok: [pg-beta-a] => 
  msg: 'First host for pg-beta-a: pg-beta-a'
ok: [pg-beta-b] => 
  msg: 'First host for pg-beta-b: pg-beta-a'
ok: [pg-beta-c] => 
  msg: 'First host for pg-beta-c: pg-beta-a'

TASK [debug] ************
ok: [pg-alpha-01] => 
  msg: 'Current host is master: True'
ok: [pg-alpha-02] => 
  msg: 'Current host is master: False'
ok: [pg-beta-a] => 
  msg: 'Current host is master: True'
ok: [pg-beta-b] => 
  msg: 'Current host is master: False'
ok: [pg-beta-c] => 
  msg: 'Current host is master: False'
    • 1

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