Abhinav Sinha
124e5276d4
- Split `scenarios/scenarios.json` into individual JSON files under `scenarios/data/` named `<scenario-id>.json` - Split `scenarios/bundles.json` into individual JSON files under `scenarios/bundles/` named `<bundle-id>.json` - Updated `backend/server.js` to dynamically load scenario and bundle files from their respective directories - Updated documentation in `scenarios/SCHEMA.md` and `README.md` to reflect the new repository layout and contributor workflow Signed-off-by: Abhinav Sinha <[email protected]>
40 lines
1.8 KiB
JSON
40 lines
1.8 KiB
JSON
{
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"id": "pod-affinity-mcq",
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"title": "Pod Affinity vs Anti-Affinity",
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"category": "Workloads & Scheduling",
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"difficulty": "Medium",
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"type": "mcq",
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"weight": 4,
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"description": "## Pod Affinity vs Anti-Affinity\n\nYou want to ensure that **cache** pods are always scheduled on the **same node** as the **app** pods they serve (to reduce latency). Which scheduling rule should you use in the cache pod spec?",
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"options": [
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{
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"id": "a",
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"text": "`spec.affinity.podAntiAffinity` with `requiredDuringSchedulingIgnoredDuringExecution` matching `app=app-pod`"
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},
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{
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"id": "b",
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"text": "`spec.affinity.podAffinity` with `requiredDuringSchedulingIgnoredDuringExecution` matching `app=app-pod`"
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},
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{
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"id": "c",
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"text": "`spec.affinity.nodeAffinity` with a `matchExpressions` for the app pod's node label"
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},
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{
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"id": "d",
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"text": "`spec.tolerations` with `key=app-pod` and `effect=NoSchedule`"
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}
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],
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"correct_option": "b",
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"explanation": "**Pod Affinity** (`spec.affinity.podAffinity`) attracts pods to nodes where matching pods are already running. Use `requiredDuringSchedulingIgnoredDuringExecution` for a hard constraint (cache pod MUST co-locate with app pod) vs `preferredDuringSchedulingIgnoredDuringExecution` for a soft preference. **Pod Anti-Affinity** does the opposite — spreads pods apart. Tolerations are unrelated to co-location and work with taints.",
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"hints": [
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{
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"title": "Affinity types",
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"body": "podAffinity = attract to same node. podAntiAffinity = repel from same node. nodeAffinity = attract to nodes with specific labels. The `topologyKey: kubernetes.io/hostname` means 'same node'.",
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"command": "kubectl explain pod.spec.affinity.podAffinity"
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}
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],
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"setup_commands": [],
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"default_namespace": "default",
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"teardown_commands": []
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}
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