Share value between hosts in playbook

[Gaetano Mazzeo]

Hi,
I need to do the following thing.
On the first host, calculate the checksum of a certain file (es. /etc/hosts) and save it into a variable, let's say "file_checksum".
On the second host, I would like to calculate newly the checksum and compare it with the one from the first host (i.e. the value saved in "file_checksum"). And so on with the other hosts of my inventory.
I tried several ways without success. Also run_once on set_fact doesn't seem to work (see below the snippet not fully working).
Any Idea how to save a value between hosts in a playbook?
Thanks in advance.
Cheers.
Gaetano

---
- name: check_configuration
  hosts: all
  serial: 1
  gather_facts: yes
   
  tasks:
 
  - name: Execution of the stat on the file
    stat: path=/etc/hosts
    register: stat_results

  - name: Check of file existence
    fail:
      msg: "The file doesn't exist!"
    when: stat_results.stat.exists|bool == false

  - debug: var=file_checksum
    when: file_checksum is defined

  - name: Set fact   
    set_fact:
      file_checksum: "{{ stat_results.stat.checksum }}"
    run_once: true

  - name: Compare of the file file_checksum
    debug: var="Checksum of the file is {{ file_checksum }} but right is {{ stat_results.stat.checksum }}"
    when: file_checksum != "" and (file_checksum != stat_results.stat.checksum)

  - name: Compare of the file_checksum with the first value
    fail:
      msg:  var="Checksum of the file is {{ file_checksum }} but right is {{ stat_results.stat.checksum }}"
    when: file_checksum != "" and file_checksum != stat_results.stat.checksum

[James Cammarata]

You can share values between hosts using the hostvars[host_name] variable, however I believe in your situation you'll want to run this in separate plays, as these task will still run on all of your systems (just one system at a time, due to the serial use).

James Cammarata

Director, Ansible Core Engineering

github: jimi-c

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