kubernetes - 以声明方式(在Yaml中)自动缩放Google Cloud-Endpoints后端部署？

Question

我已成功遵循文档here和here将API规范和GKE后端部署到Cloud Endpoints。

这给我留下了一个如下所示的deployment.yaml:

apiVersion: v1
kind: Service
metadata:
  name: esp-myproject
spec:
  ports:
  - port: 80
    targetPort: 8081
    protocol: TCP
    name: http
  selector:
    app: esp-myproject
  type: LoadBalancer
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: esp-myproject
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: esp-myproject
    spec:
      containers:
      - name: esp
        image: gcr.io/endpoints-release/endpoints-runtime:1
        args: [
          "--http_port=8081",
          "--backend=127.0.0.1:8080",
          "--service=myproject1-0-0.endpoints.myproject.cloud.goog",
          "--rollout_strategy=managed",
        ]
        ports:
        - containerPort: 8081
      - name: myproject
        image: gcr.io/myproject/my-image:v0.0.1
        ports:
        - containerPort: 8080

这将在后端创建该应用程序的单个副本。到现在为止还挺好...

我现在想将yaml文件更新为 ，以声明方式指定自动缩放参数，以使到端点的流量合理时，应用程序的多个副本可以并排运行。

我已经读过(O'Reilly的书:Kubernetes Up＆Running，GCP文档，K8s文档)，但是我有两点困扰:

我已经阅读了许多有关Horizo​​ntalPodAutoscaler的文章，但我不清楚是否部署必须使用它才能享受自动缩放的好处？

如果是这样，我在文档中看到了一些示例，这些示例说明了如何在yaml中定义Horizo​​ntalPodAutoscaler的规范，如下所示-但是如何将其与现有的deployment.yaml结合起来？

Horizo​​ntalPodAutoscaler示例( from the docs):

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: php-apache
  namespace: default
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: php-apache
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 50

预先感谢任何可以为我阐明这一点的人。

Answer 1

1. I've read a number of times about the HorizontalPodAutoscaler and it's not clear to me whether the deployment must make use of this in order to enjoy the benefits of autoscaling?

不需要，但建议使用它，并且它已经内置。您可以构建自己的自动化系统，该系统可以按比例缩放，但是问题是为什么HPA已经支持它了。

2. If so, I have seen examples in the docs of how to define the spec for the HorizontalPodAutoscaler in yaml as shown below - but how would I combine this with my existing deployment.yaml?

它应该很简单。您基本上可以在HPA定义中引用您的部署:

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: my-esp-project-hpa
  namespace: default
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: esp-myproject  <== here
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 50