What is Kubernetes DaemonSet?

Question

Accepted Answer

**DaemonSet** — ensures one Pod runs on each node.

```yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: fluentd
  namespace: kube-system
spec:
  selector:
    matchLabels:
      name: fluentd
  template:
    metadata:
      labels:
        name: fluentd
    spec:
      tolerations:
      - key: node-role.kubernetes.io/control-plane
        effect: NoSchedule
      containers:
      - name: fluentd
        image: fluentd:latest
        volumeMounts:
        - name: varlog
          mountPath: /var/log
      volumes:
      - name: varlog
        hostPath:
          path: /var/log
```

**Use cases:**
- Log collection (Fluentd, Filebeat).
- Monitoring (Prometheus Node Exporter).
- Networking (Cilium, Calico agents).

DevOps: What is Kubernetes DaemonSet?