Deamon Set , Statefull application and Stateless Applciation

 Stateful and Stateless Application:

Stateful vs Stateless: Full Difference - InterviewBit

StatefullSet:

StatefulSets | Kubernetes

DeamonSet:

Daemon Set runs a Copy of a Pod on New Node as they added to Cluster automatically. 

DaemonSet will be helpful in case of Monitoring, Log Collection, Proxy Configuration etc.

=============================

apiVersion: apps/v1

kind: DaemonSet

metadata:

  name: logging

spec:

  selector:

    matchLabels:

      app: httpd-logging

  template:

    metadata:

      labels:

        app: httpd-logging

    spec:

      containers:

        - name: webserver

          image: httpd

          ports:

            - containerPort: 80

DaemonSet

A DaemonSet ensures that all (or some) Nodes run a copy of a Pod. As nodes are added to the cluster, Pods are added to them. As nodes are removed from the cluster, those Pods are garbage collected. Deleting a DaemonSet will clean up the Pods it created.

Some typical uses of a DaemonSet are:

• running a cluster storage daemon on every node
• running a logs collection daemon on every node
• running a node monitoring daemon on every node