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]>
1.3 KiB
Demonstration: The Same Five Questions, Answered Live
OBSERVE
$ ip -4 addr show eth0
inet 172.17.0.2/16 ...
"What address do I have?" — answered.
HYPOTHESIS
Predict what ip route will show before running it — specifically, predict whether there will
be a default line.
INSPECT
$ ip route
default via 172.17.0.1 dev eth0
172.17.0.0/16 dev eth0 ...
Confirmed — a default route exists, meaning traffic to anywhere outside 172.17.0.0/16 has
somewhere to go.
CHANGE
$ ss -lnt
LISTEN 0 511 0.0.0.0:80 0.0.0.0:*
"What's listening?" — port 80, confirmed.
VERIFY
$ curl -sf http://localhost/ -o /dev/null -w '%{http_code}\n'
200
The full chain, verified end to end with real evidence at each layer — not "the network seems fine," but five specific, falsifiable answers.
Instructor Notes
Demo goal: Chain all five commands together as ONE continuous diagnostic narrative, not five disconnected syntax examples.
Approximate timing: 8 minutes live.
Common mistake to watch for: running curl first and stopping at "it worked" without ever
having separately confirmed address/route/port — fine when things work, but the WRONG habit for
when they don't (Module 5's Lab requires the full sequence).