pod-affinity.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: pod-affinity
  name: pod-affinity
spec:
  replicas: 3
  selector:
    matchLabels:
      app: pod-affinity
  template:
    metadata:
      labels:
        app: pod-affinity
    spec:
      affinity:
        podAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - pod-affinity
            topologyKey: "failure-domain.beta.kubernetes.io/zone"
          preferredDuringSchedulingIgnoredDuringExecution:
          - podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: app
                  operator: In
                  values:
                  - pod-affinity
              topologyKey: "beta.kubernetes.io/instance-type"
            weight: 100
      containers:
      - image: nginx
        name: pod-affinity