ced4568andClaude Sonnet 5
60fbf0c385
Pre-Phase-1 platform work, approved and tested earlier but not yet committed: - Terminal banner: "RootNode Academy Lab — node: k8s-lab", upstream KubeKosh attribution left untouched in footer/README/LICENSE. - RootNode curriculum mode: scenarios/rootnode-path.json (Foundation -> Workloads -> Networking -> Configuration -> Troubleshooting -> Real Ops -> Capstone), built from existing scenario content grouped by category, no new scenarios invented. New GET /api/curriculum/path endpoint. - Student roster + per-student progress: instructor-roster, pick-your-name login (no password), students/environments-adjacent progress table migrated to a (student_id, scenario_id) composite key so practice progress and exam sessions are isolated per student instead of one global bucket. New /api/roster, /api/login endpoints. - scenarios/data/*.json: added isolation_type metadata (shared_namespace vs ephemeral_cluster) from an audit of which scenarios execute cluster-scoped or node-level commands. This was Tier-1-isolation groundwork that got superseded same-day by the full-ephemeral-per-student architecture (see docs/LAB_ARCHITECTURE.md) — the field is kept as descriptive metadata only, per the note now in scenarios/SCHEMA.md. Not wasted: it's an accurate audit of which scenarios touch cluster-scoped resources, useful independent of isolation model. - .gitignore added (node_modules/, frontend/dist/, *.db, /data/, .env) — none existed before; without it, npm installs during testing would have landed in a commit. Known limitation still open: no frontend UI for any of this yet (login screen, roster-add form, curriculum view) — API-only. No auth on the roster-add endpoint. Co-Authored-By: Claude Sonnet 5 <[email protected]>
62 lines
3.0 KiB
JSON
62 lines
3.0 KiB
JSON
{
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"id": "field-selector-basics",
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"title": "Filtering Resources with Field Selectors",
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"category": "Core Concepts",
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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": "## Filtering Resources with Field Selectors\n\nField selectors let you filter Kubernetes resources by the **value of specific object fields** — similar to how label selectors work but targeting any field in the resource spec or status.\n\nCommon use cases:\n- Find all pods in a specific phase: `kubectl get pods --field-selector=status.phase=Running`\n- Find resources in a specific namespace: `kubectl get pods --field-selector=metadata.namespace=kube-system`\n\n**Your task:**\n\nSeveral pods have been created for you — some Running, some in a Failed state.\n\n1. Use a field selector to list only the **Running** pods and count them. Save the count to `/tmp/running-count.txt`\n2. Use a field selector to list all pods **not** in the `default` namespace (filter by `metadata.namespace!=default`)\n\n```bash\n# Count running pods:\nkubectl get pods --field-selector=status.phase=Running --no-headers | wc -l\n```",
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"hints": [
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{
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"title": "Field selector syntax",
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"body": "Use `--field-selector=field.path=value` to filter. Multiple conditions are comma-separated. Supported operators: `=`, `==`, `!=`.",
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"command": "kubectl get pods --field-selector=status.phase=Running"
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},
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{
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"title": "Save running pod count to a file",
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"body": "Pipe the result through wc -l and redirect to the file.",
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"command": "kubectl get pods --field-selector=status.phase=Running --no-headers | wc -l | tr -d ' ' > /tmp/running-count.txt"
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}
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],
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"setup_commands": [
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{
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"command": "kubectl run alpha --image=nginx:alpine 2>/dev/null || true"
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},
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{
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"command": "kubectl run beta --image=nginx:alpine 2>/dev/null || true"
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},
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{
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"command": "kubectl run crash-pod --image=busybox:1.36 --restart=Never -- /bin/false 2>/dev/null || true"
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},
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{
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"command": "kubectl rollout status deployment/alpha --timeout=30s 2>/dev/null || true"
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}
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],
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"validation": {
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"commands": [
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{
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"description": "File /tmp/running-count.txt exists and has a numeric value",
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"command": "cat /tmp/running-count.txt",
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"expected_output": "^[0-9]+$",
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"match": "regex"
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},
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{
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"description": "The saved count matches the actual number of Running pods",
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"command": "LIVE=$(kubectl get pods --field-selector=status.phase=Running --no-headers 2>/dev/null | wc -l | tr -d ' '); SAVED=$(cat /tmp/running-count.txt 2>/dev/null | tr -d ' '); [ \"$LIVE\" = \"$SAVED\" ] && echo 'match' || echo 'mismatch'",
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"expected_output": "match",
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"match": "exact"
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}
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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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{
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"command": "kubectl delete pod alpha beta crash-pod --ignore-not-found --grace-period=0 --force"
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},
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{
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"command": "rm -f /tmp/running-count.txt"
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}
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]
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}
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