Linux for DevOps Roadmap

Almost every DevOps failure eventually becomes a Linux question. The container will not start, the disk is full, the service exits immediately, the port is already bound — and the tooling above it can only tell you that something is wrong, not what.

This path front-loads the filesystem and the process model because they are what every later topic is built from. Permissions before services, because a systemd unit that cannot read its own config fails in a way the logs describe unhelpfully. Processes and signals before containers, because a container is a process and "it will not stop" is almost always a signal-handling problem.

Bash comes last deliberately. Scripting is the easiest part to learn badly — you can write working scripts long before you can write ones that fail safely — and it is much easier once you already know what the commands you are stringing together actually do.