Example 13

hosts.yml

centos:
  hosts:
    provisioner:
      ansible_connection: local
    centos1:
      ansible_host: '192.168.77.22'
ubuntu:
  hosts:
    ubuntu1:
      ansible_host: '192.168.77.23'

files/samplefacts1.fact

#!/bin/bash
printf '{"kernel_package": "%s"}\n' "$(uname -r)"

files/samplefacts2.fact

#!/bin/bash
echo [kernel_package]
echo package=`uname -r`

playbook.yml

- name: Example playbook
  hosts: provisioner
  fact_path: "{{ playbook_dir }}/files"
  tasks:
    - debug:
        msg: "{{ ansible_local.samplefacts1.kernel_package }}"
    - debug:
        msg: "{{ ansible_local.samplefacts2.kernel_package.package }}"

Tip

Your custom facts can be executable scripts providing that they produce a valid JSON or INI output.

Execute the following command

ansible-playbook playbook.yml

Bonus round

Ansible looks for custom facts in /etc/ansible/facts.d on the remote hosts. Create a playbook that will copy one of the facts to centos1 and story it in the aformentioned directory as an executable under the name kernel.fact. Use the file module to make sure that the necessary directory exists and the copy module to send the fact file.