Можете объяснить, что представляет собой DaemonSet в Kubernetes и зачем он нужен?

A DaemonSet in Kubernetes is an object that ensures a copy of a specific pod is running on each (or selected) node of the cluster.

The main purpose of a DaemonSet is to run system or auxiliary services that need to operate on all nodes, such as:

• Logging (e.g., Fluentd)
• Monitoring (Prometheus node exporter)
• Network agents

When a new node is added to the cluster, the DaemonSet automatically creates a pod with the required container on it. If a node is removed, the corresponding pod is also deleted.

Example of a DaemonSet manifest:

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: fluentd
spec:
  selector:
    matchLabels:
      name: fluentd
  template:
    metadata:
      labels:
        name: fluentd
    spec:
      containers:
      - name: fluentd
        image: fluent/fluentd

This ensures the continuous presence of necessary services on all nodes without manual intervention.