pod-anti-affinity.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: pod-affinity-1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: pod-affinity-1
  template:
    metadata:
      labels:
        app: pod-affinity-1
    spec:
      containers:
      - name: k8s-demo
        image: wardviaene/k8s-demo
        ports:
        - name: nodejs-port
          containerPort: 3000
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: pod-affinity-2
spec:
  replicas: 3
  selector:
    matchLabels:
      app: pod-affinity-2
  template:
    metadata:
      labels:
        app: pod-affinity-2
    spec:
      affinity:
        podAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                    - pod-affinity-1
              topologyKey: "kubernetes.io/hostname"
      containers:
      - name: redis
        image: redis
        ports:
        - name: redis-port
          containerPort: 6379
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: pod-affinity-3
spec:
  replicas: 3
  selector:
    matchLabels:
      app: pod-affinity-3
  template:
    metadata:
      labels:
        app: pod-affinity-3
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                    - pod-affinity-1
              topologyKey: "kubernetes.io/hostname"
      containers:
      - name: k8s-demo
        image: wardviaene/k8s-demo
        ports:
        - name: nodejs-port
          containerPort: 3000
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: pod-affinity-4
spec:
  replicas: 1
  selector:
    matchLabels:
      app: pod-affinity-4
  template:
    metadata:
      labels:
        app: pod-affinity-4
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                    - pod-affinity-1
                    - pod-affinity-3
              topologyKey: "kubernetes.io/hostname"
      containers:
      - name: k8s-demo
        image: wardviaene/k8s-demo
        ports:
        - name: nodejs-port
          containerPort: 3000
---