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 This was Tier-1-isolation groundwork that got superseded same-day by the full-ephemeral-per-student architecture (see docs/LAB_ARCHITECTURE.md) — the field is kept as descriptive metadata only, per the note now in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]>
68 lines
2.8 KiB
JSON
68 lines
2.8 KiB
JSON
{
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"id": "pod-disruption-budget-task",
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"title": "Configure a PodDisruptionBudget",
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"category": "Cluster Administration",
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"isolation_type": "shared_namespace",
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"difficulty": "Medium",
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"type": "task",
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"weight": 6,
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"description": "## PodDisruptionBudget\n\nA **PodDisruptionBudget (PDB)** limits the number of pods of a replicated application that are down simultaneously during voluntary disruptions (node drains, cluster upgrades). It is a critical CKA topic.\n\n**Your task:**\n\nA Deployment named `pdb-app` with **3 replicas** is already running. Create a **PodDisruptionBudget** named `web-pdb` in the `default` namespace that:\n- Applies to pods with the label `app=pdb-app`\n- Ensures **at least 2 pods** are always available (`minAvailable: 2`)\n\n```bash\n# Verify:\nkubectl get pdb web-pdb\n```",
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"hints": [
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{
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"title": "PodDisruptionBudget manifest",
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"body": "Use `spec.minAvailable` (integer or percentage) and `spec.selector.matchLabels` to target the right pods.",
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"command": "cat <<EOF | kubectl apply -f -\napiVersion: policy/v1\nkind: PodDisruptionBudget\nmetadata:\n name: web-pdb\nspec:\n minAvailable: 2\n selector:\n matchLabels:\n app: pdb-app\nEOF"
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},
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{
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"title": "Check the PDB status",
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"body": "After creating the PDB, check `kubectl get pdb web-pdb` — the ALLOWED DISRUPTIONS column shows how many pods can be disrupted at once.",
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"command": "kubectl get pdb web-pdb -o wide"
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}
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],
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"setup_commands": [
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{
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"command": "kubectl create deployment pdb-app --image=nginx:alpine --replicas=3 2>/dev/null || true"
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},
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{
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"command": "kubectl rollout status deployment/pdb-app --timeout=90s"
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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": "PDB 'web-pdb' exists",
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"command": "kubectl get pdb web-pdb -o jsonpath='{.metadata.name}'",
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"expected_output": "web-pdb",
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"match": "exact"
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},
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{
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"description": "minAvailable is 2",
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"command": "kubectl get pdb web-pdb -o jsonpath='{.spec.minAvailable}'",
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"expected_output": "2",
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"match": "exact"
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},
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{
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"description": "PDB selector targets app=pdb-app",
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"command": "kubectl get pdb web-pdb -o jsonpath='{.spec.selector.matchLabels.app}'",
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"expected_output": "pdb-app",
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"match": "exact"
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},
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{
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"description": "Deployment 'pdb-app' has 3 replicas",
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"command": "kubectl get deployment pdb-app -o jsonpath='{.spec.replicas}'",
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"expected_output": "3",
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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 pdb web-pdb --ignore-not-found"
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},
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{
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"command": "kubectl delete deployment pdb-app --ignore-not-found"
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}
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]
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}
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