ansible/remove_known_hosts.yml

   1 - name: Purge host from known hosts
   2   hosts: localhost
   3   gather_facts: no
   4   tasks:
   5     - command: ssh-keygen -f ~/.ssh/known_hosts -R [{{ item }}]:{{ hostvars[hostname].ansible_port }}
   6       with_items:
   7         - "{{ hostvars[hostname].ansible_host }}"
   8         - r3-{{ hostname }}
   9         - r3g-{{ hostname }}
  10         - r3e-{{ hostname }}
  11         - "{{ hostvars[hostname].network_cooked.primary.ip }}"