docker-development-youtube-series/kubernetes/daemonsets/daemonset-communication.yaml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: daemonset-communicate
  namespace: default
  labels:
    app: daemonset-communicate
spec:
  selector:
    matchLabels:
      name: daemonset-communicate
  template:
    metadata:
      labels:
        name: daemonset-communicate
    spec:
      tolerations:
      # this toleration is to have the daemonset runnable on master nodes
      # remove it if your masters can't run pods
      - key: node-role.kubernetes.io/master
        effect: NoSchedule
      initContainers:
      - name: create-file
        image: alpine
        env:
        - name: NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        command:
        - "bin/sh"
        - "-c"
        - "echo 'Hello from '$NODE_NAME >  /usr/share/nginx/html/index.html"
        volumeMounts:
        - name: nginx-page
          mountPath: /usr/share/nginx/html/
      containers:
      - name: daemonset-communicate
        image: nginx:1.20.0-alpine
        volumeMounts:
        - name: nginx-page
          mountPath: /usr/share/nginx/html/
        resources:
          limits:
            memory: 500Mi
          requests:
            cpu: 10m
            memory: 100Mi
        ports:
        - containerPort: 80
          name: "http"
      terminationGracePeriodSeconds: 30
      volumes:
      - name: nginx-page
        emptyDir: {}