Ansible, From Zero
You have a handful of servers, and right now they drift. You SSH in, run a few commands, edit a config by hand, forget which box got the fix and which didn't. Three months later nobody knows what's actually installed where. Ansible kills that whole class of problem: you write down the state you want once, run it, and every server matches. Run it again next week and nothing changes, because everything is already correct.
How to read this
Go in order. Phase 1 builds the mental model: agentless push over SSH, and the one idea that makes Ansible click - idempotency. Phase 2 is the everyday loop: inventory, playbooks, variables, roles, handlers. Phase 3 is production reality - what breaks, where Ansible is the wrong tool, and how it sits next to provisioning tools. You can run every example on one Linux box or a cheap VM; you don't need a fleet.
The phases
- What Ansible Actually Is - agentless config management, push over SSH, and why idempotency changes everything.
- The Everyday Loop - inventory, playbooks, modules, variables, roles, and handlers in the order you'll actually use them.
- Production Reality - gotchas, scaling, secrets, and where Ansible ends and Terraform begins.