ced4568andClaude Sonnet 5
e007bcf000
Adds all 6 ROOT 02 modules (Linux system administration, storage & filesystems, the Networking Mental Model, Linux network inspection, DNS & HTTP, Linux troubleshooting) — 37 activities, each with a real lesson, demonstration/guided exercise, knowledge check, hands-on Lab, and reflection. The Networking Mental Model module (M3) gets deliberately extra depth per its "critical module" designation, with no lab by design — conceptual mastery via knowledge check and guided exercise, matching root-05-m00's own precedent. Adds 6 new hands-on Linux/networking scenarios plus 2 MCQs: linux-service-inspection (inspects the platform's own real nginx without touching it — a genuinely safe, real service-inspection target that avoids ever risking the Lab's own connectivity), linux-service-lifecycle (start/ verify/stop a fully controllable service), linux-storage-inspection, linux-network-inspection (ip/ss/getent/curl, each framed as answering one specific diagnostic question), linux-dns-http-diagnosis (a genuine DNS-resolves-but-wrong-port failure, diagnosed and fixed), and linux-troubleshooting-framework (a real missing-config-file failure, resolved via the RootNode Observe/Evidence/Hypothesis/Test/Repair/Validate/Prevent framework). All tested end-to-end via the real scenario-validation API, including negative tests confirming they fail when unsolved. Wires rootnode-linux-networking-assessment (2 required + 4 random-draw scenarios) using the existing Phase 3B assessment engine. Co-Authored-By: Claude Sonnet 5 <[email protected]>
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Knowledge Check: Storage and Filesystems
1. df -h / shows only 23% used, but you suspect one directory is unusually large. Does
df alone answer that?
Answer: No — df reports overall filesystem usage, not per-directory. You need du -sh <path>
pointed at the suspect directory (or directories) to answer that.
2. What makes data in a container's writable layer different from data in /home?
Answer: By convention and design, a container's own writable layer is meant to be disposable —
data there disappears when the container is destroyed, unless explicitly persisted elsewhere
(a topic ROOT 04 covers directly). /home data is expected to persist normally.
3. What does "mounting" a filesystem actually mean?
Answer: Attaching a filesystem so it becomes accessible at a specific directory path — /
itself is a mount point, and additional filesystems can be mounted at other paths.
Instructor Notes
Facilitation: Question 2 previews ROOT 04's volume/bind-mount content directly — worth naming that connection explicitly.
Approximate timing: 5 minutes.