my-docs/Containerization & Orchestration/Kubernetes/components/6-DaemonSet.md

🧩 DaemonSet in Kubernetes

A DaemonSet ensures that a copy of a specific pod runs on every (or some) node in the cluster. It’s typically used for background system-level services like log collection, monitoring, or networking tools.

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📌 Key Characteristics

• Automatically deploys one pod per worker node.
• Ensures the pod stays on each node as long as the DaemonSet exists.
• Automatically adds pods to new nodes when they join the cluster.

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📄 Example DaemonSet YAML

Below is a simple DaemonSet example that deploys nginx to every node in the web namespace:

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: nginx
  namespace: web
  labels:
    app: web-servers
spec:
  selector:
    matchLabels:
      app: web-servers
  template:
    metadata:
      labels:
        app: web-servers
    spec:
      containers:
        - name: nginx
          image: nginx:1.27