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 This was Tier-1-isolation groundwork that got superseded same-day by the full-ephemeral-per-student architecture (see docs/LAB_ARCHITECTURE.md) — the field is kept as descriptive metadata only, per the note now in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]>
67 lines
3.1 KiB
JSON
67 lines
3.1 KiB
JSON
{
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"id": "kubectl-diff-basics",
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"title": "Previewing Changes with kubectl diff",
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"category": "Core Concepts",
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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": 4,
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"description": "## Previewing Changes with `kubectl diff`\n\n`kubectl diff` compares a local manifest file against the **live state** of a resource in the cluster, showing exactly what would change if you applied it — without actually making any changes. This is a safe way to review updates before rolling them out.\n\n**Your task:**\n\nA Deployment named `diffme` is running with 1 replica and image `nginx:1.24`.\n\n1. Write a updated manifest for the same Deployment with **3 replicas** and image `nginx:1.25` to `/tmp/diffme-updated.yaml`\n2. Run `kubectl diff` against it to preview the changes\n3. Then **apply** the updated manifest to make the changes live\n\n```bash\n# Preview changes:\nkubectl diff -f /tmp/diffme-updated.yaml\n\n# Apply changes:\nkubectl apply -f /tmp/diffme-updated.yaml\n```",
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"hints": [
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{
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"title": "Write the updated manifest",
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"body": "Create a YAML file with the updated replicas and image values.",
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"command": "cat <<EOF > /tmp/diffme-updated.yaml\napiVersion: apps/v1\nkind: Deployment\nmetadata:\n name: diffme\nspec:\n replicas: 3\n selector:\n matchLabels:\n app: diffme\n template:\n metadata:\n labels:\n app: diffme\n spec:\n containers:\n - name: app\n image: nginx:1.25\nEOF"
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},
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{
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"title": "Run kubectl diff",
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"body": "kubectl diff exits with code 1 if there are differences (expected), code 0 if nothing changed.",
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"command": "kubectl diff -f /tmp/diffme-updated.yaml; echo \"Exit code: $?\""
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},
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{
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"title": "Apply the manifest",
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"body": "Once you have reviewed the diff output, apply the manifest to update the live cluster state.",
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"command": "kubectl apply -f /tmp/diffme-updated.yaml"
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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 diffme --image=nginx:1.24 --replicas=1 2>/dev/null || true"
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},
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{
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"command": "kubectl rollout status deployment/diffme --timeout=60s"
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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": "Deployment 'diffme' has 3 replicas",
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"command": "kubectl get deployment diffme -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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"description": "Deployment uses nginx:1.25 image",
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"command": "kubectl get deployment diffme -o jsonpath='{.spec.template.spec.containers[0].image}'",
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"expected_output": "nginx:1.25",
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"match": "exact"
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},
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{
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"description": "Manifest file exists at /tmp/diffme-updated.yaml",
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"command": "test -f /tmp/diffme-updated.yaml && echo 'exists'",
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"expected_output": "exists",
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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 deployment diffme --ignore-not-found"
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},
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{
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"command": "rm -f /tmp/diffme-updated.yaml"
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}
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]
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}
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