apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: demo-ha
  labels:
    app: demo-ha
spec:
  replicas: 2
  selector:
    matchLabels:
      app: demo-ha
  template:
    metadata:
      labels:
        app: demo-ha
        active: None
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - demo-ha
            topologyKey: "kubernetes.io/hostname"
    spec:
      containers:
      - name: nginx
        image: nginx
        resources:
          requests:
            cpu: "15"
        ports:
        - containerPort: 80
        volumeMounts:
        - name: workdir
          mountPath: /usr/share/nginx/html
      initContainers:
      - name: install
        image: busybox
        command:
        - wget
        - "-O"
        - "/work-dir/index.html"
        - http://kubernetes.io
        volumeMounts:
        - name: workdir
          mountPath: "/work-dir"
      dnsPolicy: Default
      volumes:
      - name: workdir
        emptyDir: {}