Deployment file to distrubute pods inside replicaset to both SPOT and ON_DEMAND instance nodes or node-groups.

spot_ondemand_deployment.yaml

kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 10
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      affinity:
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 40
            preference:   
              matchExpressions:
              - key: eks.amazonaws.com/capacityType
                operator: In
                values:
                - SPOT
          - weight: 60
            preference:
              matchExpressions:
              - key: eks.amazonaws.com/capacityType
                operator: In
                values:
                - "ON_DEMAND"
      containers:
      - image: nginx
        name: nginx