[idoubtit]

ansible. And similar tools, but lack experience outside of ansible. You can see Ansible a a tool to automate the install/configure/update process that you would do manually on a single server. Then you can apply this "playbook" to any server.

You just need an ssh connection to the target servers, with python installed on them. Of course, you have to write rules for setting up a server, provisioning users, monitoring (deploying Prometheus, pushing logs to a central server...). There various plugins for integrating with providers, but the basic features are provider independent.

Ansible is far from perfect (dependency on python, inconsistent syntax, abuse of aliases, missing a strict mode...), but it's rather easy to learn and I've used it successfully (at a small scale).