Ansible:获取组中的主机数

问题描述

我正在尝试获取某个组的主机数量.

I'm trying to get the number of hosts of a certain group.

想象一个这样的清单文件:

Imagine an inventory file like this:

[maingroup]
server-[01:05]

现在在我的剧本中，我想获取属于 maingroup 的主机数量，在这种情况下为 5 并将其存储在一个变量中应该在剧本任务之一的模板中使用.

Now in my playbook I would like to get the number of hosts that are part of maingroup which would be 5 in this case and store that in a variable which is supposed to be used in a template in one of the playbook's tasks.

目前我正在手动设置变量，这远非理想..

At the moment I'm setting the variable manually which is far from ideal..

vars:
  HOST_COUNT: 5

推荐答案

  vars:
    HOST_COUNT: "{{ groups['maingroup'] | length }}"

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