Проверяется переменные ansible: ansible_os_family, ansible_distribution, типа:

include_tasks: RedHat-setup.yml
  when: ansible_os_family == 'RedHat'

include_tasks: Ubuntu-setup.yml
  when: ansible_distribution == 'Ubuntu'

• export ANSIBLE_HOST_KEY_CHECKING=False
• в ansible.cfg прописать host_key_checking = False
• https://stackoverflow.com/questions/23074412/how-to-set-host-key-checking-false-in-ansible-inventory-file