I have a namespace called airflow that has 2 pods: webserver and scheduler. I want to deploy scheduler on node A and webserver on node B.

And here you can see deployment files:

scheduler:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  namespace: airflow
  name: airflow-scheduler
  labels:
    name: airflow-scheduler
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: airflow-scheduler
    spec:
      terminationGracePeriodSeconds: 60
      containers:        
        - name: scheduler
          image: 123423.dkr.ecr.us-east-1.amazonaws.com/airflow:$COMMIT_SHA1          
          volumeMounts:
          - name: logs
            mountPath: /logs          
          command: ["airflow"]
          args: ["scheduler"]
          imagePullPolicy: Always
          resources:
            limits:
              memory: "3072Mi"
            requests:
              cpu: "500m"
              memory: "2048Mi"
      volumes:
          - name: logs
            persistentVolumeClaim:
              claimName: logs

webserver:

apiVersion: v1
kind: Service
metadata:
  name: airflow-webserver
  namespace: airflow
  labels:
    run: airflow-webserver
spec:
  ports:
  - port: 80
    targetPort: 8080
  selector:
    run: airflow-webserver
---    
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: airflow-webserver
  namespace: airflow
  annotations:
    kubernetes.io/ingress.class: nginx
    certmanager.k8s.io/cluster-issuer: letsencrypt-prod
spec:
  tls:
    - hosts:
        - airflow.awesome.com.br
      secretName: airflow-crt
  rules:
    - host: airflow.awesome.com.br
      http:
        paths:
          - path: /
            backend:
              serviceName: airflow-webserver
              servicePort: 80
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  namespace: airflow
  name: airflow-webserver
  labels:
    run: airflow-webserver
spec:
  replicas: 1
  template:
    metadata:
      labels:
        run: airflow-webserver
    spec:
      terminationGracePeriodSeconds: 60
      containers:
        - name: webserver
          image: 123423.dkr.ecr.us-east-1.amazonaws.com/airflow:$COMMIT_SHA1
          volumeMounts:
          - name: logs
            mountPath: /logs          
          ports:
            - containerPort: 8080
          command: ["airflow"]
          args: ["webserver"]
          imagePullPolicy: Always
          resources:
            limits:
              cpu: "200m"
              memory: "3072Mi"
            requests:
              cpu: "100m"
              memory: "2048Mi"              
      volumes:
          - name: logs
            persistentVolumeClaim:
              claimName: logs

What's the proper way to ensure that pods will be deployed on different nodes?

edit1:

antiaffinity is not working:

I've tried to set podAntiAffinity on scheduler but it's not working:

  affinity:
    podAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: name
            operator: In
            values:
            - airflow-webserver
        topologyKey: "kubernetes.io/hostname"