ssh_key_file v23
By default, tpaexec provision will use ssh-keygen to generate a new
SSH keypair for the cluster (into files named id_cluster_name and
id_cluster_name.pub inside the cluster directory).
If you want to use an existing key instead, you can set ssh_key_file
at the top level of config.yml to the location of an SSH private key
file. The corresponding public key must be available with an extension
of .pub at the same location:
ssh_key_file: ~/.ssh/id_rsa
(If this file does not already exist, it will be created by ssh-keygen
during provisioning.)