Deployments in Depth

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
spec:
  replicas: 10
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1     # never have more than 1 Pod down at once
      maxSurge: 2           # up to 2 extra Pods during rollout (12 briefly)
  selector:
    matchLabels: { app: myapp }
  template:
    metadata: { labels: { app: myapp } }
    spec:
      containers:
        - name: web
          image: myapp:1.2.0
          readinessProbe:
            httpGet: { path: /ready, port: 3000 }
            initialDelaySeconds: 5
            periodSeconds: 5
          livenessProbe:
            httpGet: { path: /healthz, port: 3000 }
            initialDelaySeconds: 15
            periodSeconds: 10