known_hosts file on host causing ssh problems

[Vincent Fulco]

First weekend getting my feet wet with ansible and a relative noob with ssh, using the 5-minute-bootstrap repo, found on git (https://github.com/robfeldmann/5-min-bootstrap) which is excellent,  to provision a fresh linode VPS (removing root, adding a foo user, adding ssh logins, etc) before installing dokku-alt (manually for now). The script works all the way through to the end so long as I comment out the latest line in known_hosts file on the host.  I have "host_key_checking = False"in the /etc/ansible/ansible.cfg on the host.  Should I set up a directory specific .cfg file with the same (next step)?

Any help would much appreciated.  I would prefer to turn it off.