如何根据另一个部署产生的指标使HPA扩展一个部署 [英] How to make HPA scale a deployment based on metrics produced by another deployment

问题描述

我要实现的目标是创建一个水平容器自动缩放器，该缩放器能够根据 controller 容器生成的自定义指标来缩放 worker 容器.

What I am trying to achieve is creating a Horizontal Pod Autoscaler able to scale worker pods according to a custom metric produced by a controller pod.

我已经拥有Prometheus抓取，Prometheus Adapater，Custom Metric Server完全可操作，并使用由 worker产生的自定义指标 my_controller_metric 扩展了 worker 部署code>豆荚已经可以使用了.

I already have Prometheus scraping, Prometheus Adapater, Custom Metric Server fully operational and scaling the worker deployment with a custom metric my_controller_metric produced by the worker pods already works.

现在，我的 worker pods不再产生此指标，但 controller 会产生.似乎API autoscaling/v1不支持此功能.如有必要，我可以使用autoscaling/v2beta1 API来指定HPA.

Now my workerpods don't produce this metric anymore, but the controller does. It seems that the API autoscaling/v1 does not support this feature. I am able to specify the HPA with the autoscaling/v2beta1 API if necessary though.

这是我对此HPA的规格:

Here is my spec for this HPA:

apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: my-worker-hpa
  namespace: work
spec:
  maxReplicas: 10
  minReplicas: 1
  scaleTargetRef:
    apiVersion: extensions/v1beta1
    kind: Deployment
    name: my-worker-deployment
  metrics:
  - type: Object
    object:
      target:
        kind: Deployment
        name: my-controller-deployment
      metricName: my_controller_metric
      targetValue: 1

当使用 kubectl应用配置时，应用-f my-worker-hpa.yml 我得到消息:

horizontalpodautoscaler "my-worker-hpa" configured

尽管此消息似乎还可以，但是HPA无法正常工作.这个规范格式不正确吗?

Though this message seems to be OK, the HPA does not work. Is this spec malformed?

正如我所说，该度量标准在Custom Metric Server中可用，代码为 kubectl get --raw"/apis/custom.metrics.k8s.io/v1beta1" |jq.|grep my_controller_metric .

As I said, the metric is available in the Custom Metric Server with a kubectl get --raw "/apis/custom.metrics.k8s.io/v1beta1" | jq . | grep my_controller_metric.

这是HPA的错误消息:

This is the error message from the HPA:

Type           Status  Reason                 Message
----           ------  ------                 -------
AbleToScale    True    SucceededGetScale      the HPA controller was able to get the target's current scale
ScalingActive  False   FailedGetObjectMetric  the HPA was unable to compute the replica count: unable to get metric my_controller_metric: Deployment on work my-controller-deployment/unable to fetch metrics from custom metrics API: the server could not find the metric my_controller_metric for deployments

谢谢！

推荐答案

在您的情况下，问题是HPA配置: spec.metrics.object.target 也应指定API版本.将 apiVersion:extensions/v1beta1 放在 spec.metrics.object.target 下应该可以解决此问题.

In your case problem is HPA configuration: spec.metrics.object.target should also specify API version. Putting apiVersion: extensions/v1beta1 under spec.metrics.object.target should fix it.

此外，关于HPA中更好的配置验证，还有一个未解决的问题: https://github.com/kubernetes/kubernetes/issues/60511

In addition, there is an open issue about better config validation in HPA: https://github.com/kubernetes/kubernetes/issues/60511

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