rolling_update_nginx.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    run: nginx
  name: nginx
spec:
  replicas: 5
  selector:
    matchLabels:
      run: nginx
  strategy:                    # <-- Type of upgrade
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1              # <-- number of extra containers
      maxUnavailable: 0        # <-- respective number of possible less containers
  template:
    metadata:
      creationTimestamp: null
      labels:
        run: nginx
    spec:
      containers:
      - image: nginx:1.17       # <-- new version 
        name: nginx