How to write an Ansible playbook with port knocking

My server is set up to require port knocking in order to white-list an IP for port 22 SSH. I've found guides on setting up an Ansible playbook to configure port knocking on the server side, but not to perform port knocking on the client side.

For example, what would my playbook and/or inventory files look like if I need to knock port 9999, 9000, then connect to port 22 in order to run my Ansible tasks?

Solution

You can try out my ssh_pkn connection plugin.

# Example host definition:
#   [pkn]
#   myserver ansible_host=my.server.at.example.com
#   [pkn:vars]
#   ansible_connection=ssh_pkn
#   knock_ports=[8000,9000]
#   knock_delay=2