How to set ansible’s gather_subset per host

ansible

We can use gather_subset at play level.
Is it possible to use it on a per host level? Like putting it in a host_vars file?
My quick testing on 2.2.1.0 did not work out.

My problem at hand: I have a host, for which get_cpu_facts fails. And really, I never need hardware facts for this host, so I would like to put "!hardware" in its gather_subset.

Best Answer

AFAIK you can't set gather_subset per host if you use automatic fact gathering at play start.

But you can disable automatic fact gathering and call setup manually with required parameters (which can be supplied from host vars):

---
- hosts: all
  gather_facts: no
  pre_tasks:
    - setup:
        gather_subset: "{{ gather_subset | default(omit) }}"

Related Solutions

Ansible – How to Run One Task Host by Host

You can run a single task in serial (i.e. host-by-host) by adding throttle: 1 to it.

Example:

---

- hosts: all
  tasks:
      - name: wait in parallel
        command: sleep 20
      - name: wait  in serial
        command: sleep 30
        throttle: 1

References:

NB: throttle was introduced in Ansible 2.9

Ansible with_items doesn’t print whole item

Ansible 2.2 has loop_control.label for this.

- name: Secure ssl keys
  file: path={{ item.path }} user=root group=root mode=600
  with_items: secure_ssl_keys_result.files
  loop_control:
    label: "{{ item.path }}"

Found via: https://stackoverflow.com/a/42832731/799204
Documentation: http://docs.ansible.com/ansible/playbooks_loops.html#loop-control

Best Answer

Related Solutions

Ansible – How to Run One Task Host by Host

Ansible with_items doesn’t print whole item

Related Topic