A couple of thousand new servers to add into ansible

I am currently setting up to add a couple of thousand servers into ansible config mgmt. Does anyone know of any blogs scripts etc that could be helpful. specifically I am looking into automated login scripts like expect or ?? . I am adding a new local ansible user and a public key with a basic bash script.

For starter you may look at mine: https://github.com/mz0/ansible-digitalocean
So far it deals with one host, that part needs a thought.

Do you have root access (directly, by certificate) from your ansible control node? Do you have a inventory file (dynamic or static)?

are you familiar with ansible? I suggest looking into the starting guide and best practice if you don’t.