Deplyoment example for nginx - taken from https://kubernetes.io/docs/concepts/workloads/controllers/deployment/

deploymentexample.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3 # This can be changed any time as config and pods will scale up with the change
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80