Lesson Focus
What this lesson covers
Linux+ tests container storage because persistence is where many real container deployments go wrong. This episode explains how containers use a layered filesystem model: an image provides read-only layers, a container adds a writable layer, and volumes or bind mounts provide persistent storage outside the container’s ephemeral write layer. You’ll learn why this matters on the exam: if data must survive container recreation, it belongs in a volume or an intentionally mapped host path, not inside the container’s writable layer. We also introduce overlay concepts at a practical level, focusing on the boundary between what is part of the image, what is transient at runtime, and what is explicitly persisted, because many questions hinge on that distinction.
