HorizontalPodAutoscaler

https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/

whoami/hpa.yml

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: whoami
  namespace: __NAME__
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: whoami
  minReplicas: 3
  maxReplicas: 6
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 20
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 10
      policies:
        - type: Percent
          value: 100
          periodSeconds: 15
    scaleUp:
      stabilizationWindowSeconds: 10
      policies:
        - type: Percent
          value: 100
          periodSeconds: 15
      selectPolicy: Max

apiVersion: apps/v1
kind: Deployment
metadata:
  name: whoami
  namespace: __NAME__
spec:
  selector:
    matchLabels:
      app: whoami
  template:
    metadata:
      labels:
        app: whoami
    spec:
      containers:
        - name: whoami
          image: jwilder/whoami
          resources:
            requests:
              cpu: 0.1

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8. Envs and Secrets and ConfigMaps