Ansible playbook to distribute ssh public key to hosts

distribute_ssh_key.yml

---
- hosts: all
  gather_facts: no
  tasks:
    - local_action: command grep '{{ ansible_ssh_host }} ' /root/.ssh/known_hosts
      register: exists
      ignore_errors: True
      changed_when: False
    - local_action: shell ssh-keyscan -p {{ ansible_ssh_port|default(22) }} {{ ansible_ssh_host }}
      register: result
      when: exists|failed
    - local_action: known_hosts path='/root/.ssh/known_hosts' host={{ ansible_ssh_host }} key="{{ result.stdout }}"
      when: exists|failed

- hosts: dmz-vms
  tasks:
    - yum: pkg=libselinux-python

- hosts: all
  tasks:
    - authorized_key: user=root key="{{ lookup('file', '/root/.ssh/id_rsa.pub') }}"