Find number of servers where something is true

[Tommy Ash]

Hi,  I'm trying to get a count of how many servers have a specific file on them.  For example, if /tmp/testFile is on 8 of 25 hosts that I'm running a playbook against, I'd like to register a variable and give it the value of 8.  Is this possible?

[Dick Davies]

http://docs.ansible.com/ansible/group_by_module.html

will let you make a group by fact, you could then just have a task
on localhost output '{{ groups["has_that_file"] _ length }}".

There's a set_fact task you can use to set a (boolean) fact on hosts,
or just bite the bullet and write a custom fact.

It seems a bit of an odd requirement to be honest, that's the best I can
suggest from what you've posted.

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[Dick Davies]

On 19 June 2017 at 17:13, Dick Davies <di...@hellooperator.net> wrote:

> will let you make a group by fact, you could then just have a task
> on localhost output '{{ groups["has_that_file"] _ length }}".

sorry that should be:

{{ groups["has_that_file"] | length }}

[Matt Martz]

This can also be accomplished using the `stat` module, and then a little jinja2 pipeline:

- hosts: all

  tasks:

    - stat:

        path: /tmp

      register: stat_result

    - debug:

        msg: "{{ hostvars|dictsort|selectattr('1.stat_result.stat.exists')|list|length }}"

      run_once: true

This would output something like the following for me:

TASK [debug] *********************************************************************************************************************************************************************

ok: [example.org] => {

    "msg": "8"

}

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Matt Martz
@sivel
sivel.net