{
  "id": "daemonset-mcq",
  "title": "Understanding DaemonSets",
  "category": "Workloads",
  "difficulty": "Easy",
  "type": "mcq",
  "weight": 3,
  "description": "## Understanding DaemonSets\n\nYour team wants to deploy a **log collector agent** that must run on **every node** in the cluster, including any nodes added in the future.\n\nWhich Kubernetes resource is the best fit?",
  "options": [
    {
      "id": "a",
      "text": "A `Deployment` with `replicas` set to the number of nodes"
    },
    {
      "id": "b",
      "text": "A `StatefulSet` with `replicas` matching the node count"
    },
    {
      "id": "c",
      "text": "A `DaemonSet`, which automatically places one pod per node and adapts as nodes join or leave"
    },
    {
      "id": "d",
      "text": "A `CronJob` that runs `kubectl create pod` on each node every minute"
    }
  ],
  "correct_option": "c",
  "explanation": "A **DaemonSet** guarantees that exactly one copy of a pod runs on every (or selected) node. As nodes are added to the cluster, the DaemonSet controller automatically schedules the pod on them; when nodes are removed, the pods are garbage-collected. Classic use cases: log shippers (Fluentd, Filebeat), monitoring agents (Prometheus Node Exporter), and CNI plugins. A Deployment with fixed replicas does NOT guarantee one-pod-per-node coverage.",
  "hints": [
    {
      "title": "When to use a DaemonSet",
      "body": "DaemonSets are ideal for cluster-level infrastructure: log collection, metrics agents, node monitoring, and CNI/CSI plugins that need to run on every node.",
      "command": "kubectl explain daemonset.spec"
    }
  ],
  "setup_commands": [],
  "default_namespace": "default",
  "teardown_commands": []
}