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]>
38 lines
2.7 KiB
JSON
38 lines
2.7 KiB
JSON
{
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"id": "linux-service-lifecycle",
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"title": "Start, Verify, and Stop a Service",
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"category": "Linux Administration",
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"isolation_type": "shared_namespace",
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"difficulty": "Easy",
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"type": "task",
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"weight": 4,
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"description": "## Start, Verify, and Stop a Service\n\nUnlike the previous exercise (inspecting a service you must never touch), this one is yours to fully control.\n\n**Your task:**\n\n1. Start a small HTTP service in the background, listening on port 8890: `python3 -m http.server 8890 --directory /srv/service-lab &`, and save its PID to `/srv/service-lab/service.pid`\n2. Confirm it's actually listening, and record the result to `/srv/service-lab/status-before.txt` (write exactly `listening`)\n3. Stop it using the PID you saved\n4. Confirm it's actually gone, and record the result to `/srv/service-lab/status-after.txt` (write exactly `stopped`)",
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"hints": [
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{
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"title": "Starting and recording the PID",
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"body": "`$!` after backgrounding a command holds its PID.",
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"command": "mkdir -p /srv/service-lab\npython3 -m http.server 8890 --directory /srv/service-lab >/srv/service-lab/service.log 2>&1 &\necho $! > /srv/service-lab/service.pid"
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},
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{
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"title": "Verifying and stopping",
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"body": "`ss -lnt | grep 8890` confirms it's listening. `kill $(cat .../service.pid)` stops it using the PID you recorded, not a hardcoded number.",
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"command": "ss -lnt | grep 8890 && echo listening > /srv/service-lab/status-before.txt\nkill $(cat /srv/service-lab/service.pid)\nsleep 1\nss -lnt | grep 8890 || echo stopped > /srv/service-lab/status-after.txt"
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}
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],
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"setup_commands": [
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{ "command": "mkdir -p /srv/service-lab" }
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],
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"validation": {
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"commands": [
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{ "description": "confirmed the service was actually listening before stopping it", "command": "cat /srv/service-lab/status-before.txt", "expected_output": "listening", "match": "exact" },
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{ "description": "confirmed the service is actually stopped now", "command": "cat /srv/service-lab/status-after.txt", "expected_output": "stopped", "match": "exact" },
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{ "description": "the process is genuinely no longer running", "command": "kill -0 $(cat /srv/service-lab/service.pid) 2>/dev/null && echo RUNNING || echo GONE", "expected_output": "GONE", "match": "exact" },
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{ "description": "port 8890 is genuinely no longer bound", "command": "ss -lnt | grep -q 8890 && echo BOUND || echo FREE", "expected_output": "FREE", "match": "exact" }
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]
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},
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"default_namespace": "default",
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"teardown_commands": [
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{ "command": "[ -f /srv/service-lab/service.pid ] && kill $(cat /srv/service-lab/service.pid) 2>/dev/null; rm -rf /srv/service-lab" }
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]
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}
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