pod-affinity-demo.yaml

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: affinity
  labels:
    app: affinity
spec:
  replicas: 3
  revisionHistoryLimit: 10
  template:
    metadata:
      labels:
        app: affinity
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - name: http
          containerPort: 80
      affinity:
        podAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - busybox-pod
            topologyKey: kubernetes.io/hostname