`kubectl get hpa`显示目标为未知，并且当负载增加时不会自动调整pod？

Question

我为该部署创建了一个部署和一个HPA（单节点minikube集群）。但是当我运行kubectl get hpa时，它显示目标为未知（截图如下）

NAME       REFERENCE             TARGETS        MINPODS   MAXPODS   REPLICAS   AGE
producer   Deployment/producer   <unknown>/1%   1         3         1          42m

以下是deployment.yaml文件：

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  annotations:
    kompose.cmd: kompose convert
    kompose.version: 1.1.0 (36652f6)
  creationTimestamp: null
  labels:
    io.kompose.service: producer
  name: producer
spec:
  replicas: 1
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        io.kompose.service: producer
    spec:
      containers:
      - image: <image name>
        name: producer
        ports:
        - containerPort: 8090
        env:
        - name: mongoUrl
          value: mongodb://mongo:27017
        - name: mongoHost
          value: mongo
        - name: mongoPort
          value: "27017"
        resources:
          requests:
            cpu: 10m
         resources: {}
       restartPolicy: Always
status: {}

我运行kubectl autoscale deployment producer --cpu-percent=1 --min=1 --max=3命令为生产者部署设置自动缩放器。以下是kubectl describe hpa的输出：

Type     Reason                        Age                 From                       Message
  ----     ------                        ----                ----                       -------
  Warning  FailedComputeMetricsReplicas  43m (x13 over 49m)  horizontal-pod-autoscaler  failed to get cpu utilization: missing request for cpu on container producer in pod default/producer-c7dd566f6-69gbq
  Warning  FailedGetResourceMetric       4m (x91 over 49m)   horizontal-pod-autoscaler  missing request for cpu on container producer in pod default/producer-c7dd566f6-69gbq

我已经在minikube上启用了heapster和metrics-server插件，等待hpa从最后30分钟开始运行。

来自minikube的kube-controller-manager的日志：

{"log":"I0912 10:36:40.806224       1 event.go:218] Event(v1.ObjectReference{Kind:\"HorizontalPodAutoscaler\", Namespace:\"default\", Name:\"producer\", UID:\"135d0ebc-b671-11e8-a19f-080027646864\", APIVersion:\"autoscaling/v2beta1\", ResourceVersion:\"71101\", FieldPath:\"\"}): type: 'Warning' reason: 'FailedGetResourceMetric' missing request for cpu on container producer in pod default/producer-c7dd566f6-w8zcd\n","stream":"stderr","time":"2018-09-12T10:36:40.80645916Z"}
{"log":"I0912 10:36:40.806511       1 event.go:218] Event(v1.ObjectReference{Kind:\"HorizontalPodAutoscaler\", Namespace:\"default\", Name:\"producer\", UID:\"135d0ebc-b671-11e8-a19f-080027646864\", APIVersion:\"autoscaling/v2beta1\", ResourceVersion:\"71101\", FieldPath:\"\"}): type: 'Warning' reason: 'FailedComputeMetricsReplicas' failed to get cpu utilization: missing request for cpu on container producer in pod default/producer-c7dd566f6-w8zcd\n","stream":"stderr","time":"2018-09-12T10:36:40.806564094Z"}

kubectl top nodes的输出

NAME       CPU(cores)   CPU%      MEMORY(bytes)   MEMORY%   
minikube   336m         16%       1518Mi          19%    

我已经尝试为horizontal-pod-autoscaler-use-rest-clients=false设置kube-controller-manager，仍然面临同样的问题。

Answer 1

问题出在我的producer-deployment.yaml上，因为我已经通过编写以下行来覆盖资源请求为null：resources: {}

resources:
    requests:
        cpu: 10m

这使我的资源请求为null，这就是heapster显示missing request for cpu on container producer的原因。

删除线resources: {}形式producer-deployment.yaml解决了这个问题。