ansible gather_facts setup

1、setup 从远程机器上获取facts
gather_subset参数默认是all，定义收集信息的范围。可能参数有all, min, hardware, network, virtual, ohai, and facter

#ansible all -m setup -a 'gather_subset=!all,!any,facter'
- name: Collect only facts returned by facter
  setup:
    gather_subset:
      - '!all'
      - '!any'
      - facter

2、默认使用setup模块来获取远程主机信息

- hosts: web
  gather_facts: True
  gather_subset: network

- hosts: web
  gather_facts: True
  gather_subset: network,virtual

总结：平时使用二者没有多大区别（个人结论）

参考文章：
https://medium.com/@abhijeet.kamble619/10-things-you-should-start-using-in-your-ansible-playbook-808daff76b65
https://docs.ansible.com/ansible/devel/modules/gather_facts_module.html