deployment-rollingupdate.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-dep
  namespace: default
spec:
  replicas: 2
  strategy:
    type: RollingUpdate
    rollingUpdate:
       maxUnavailable: 25%
       maxSurge: 1
  selector:
    matchLabels:
      app: my-dep
  template:
    metadata:
      labels:
        app: my-dep
    spec:
      containers:
      - image: gcr.io/google-samples/hello-app:2.0
        imagePullPolicy: Always
        name: my-dep
        ports:
        - containerPort: 8080
        readinessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 5
          successThreshold: 1