Replicasets

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: frontend
  labels:
    app: nginx
    tier: frontend
spec:
  replicas: 2
  selector:
    matchLabels: 
      tier: frontend
    matchExpressions:
      - {key: tier, operator: In, values: [frontend]}
  template:
    metadata:
      labels:
        app: nginx
        tier: frontend
    spec:
      containers:
      - name: nginx
        image: darealmc/nginx-k8s:v1
        ports:
        - containerPort: 80