Describe a host as one block of YAML, run one playbook, get a configured server - and the same playbook does it to a whole fleet, the same way every time. The inventory says what a host should be; the AWX job log says …
A 6-node K3s cluster as one git repo. Push to master, ArgoCD picks it up, nothing gets deployed by hand. Three layers, sync waves, and the parts that took longest to get right.
The full writeup: a 6-node K3s HA cluster bootstrapped from one git repo - install, Calico/MetalLB/Traefik/Longhorn, ArgoCD app-of-apps, Vault + AVP secrets, three-layer sync ordering, and day-to-day operations.
A categorized list of technologies worked with across administration, automation, backups, databases, networking, virtualization, storage, VPN, and web.