docker - kubectl 顶级节点 `error: metrics not available yet` 。不推荐使用指标服务器作为 Heapster

Question

Kubernetes 无法找到 metric-server api。我在 Mac 上使用 Kubernetes 和 Docker。我试图从以下示例中进行 HPA [ https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/] .但是，当我执行命令时 kubectl get hpa ，我的目标仍然未知。然后我试了一下，kubectl describe hpa .这给了我如下错误:

  Name:                                                  php-apache
  Namespace:                                             default
  Labels:                                                <none>
  Annotations:                                           <none>
  CreationTimestamp:                                     Sun, 07 Oct 2018 12:36:31 -0700
  Reference:                                             Deployment/php-apache
  Metrics:                                               ( current / target )
    resource cpu on pods  (as a percentage of request):  <unknown> / 5%
  Min replicas:                                          1
  Max replicas:                                          10
  Conditions:
    Type           Status  Reason                   Message
    ----           ------  ------                   -------
    AbleToScale    True    SucceededGetScale        the HPA controller was able to get the target's current scale
    ScalingActive  False   FailedGetResourceMetric  the HPA was unable to compute the replica count: unable to get metrics for resource cpu: no metrics returned from resource metrics API
  Events:
    Type     Reason                        Age               From                       Message
    ----     ------                        ----              ----                       -------
    Warning  FailedComputeMetricsReplicas  1h (x34 over 5h)  horizontal-pod-autoscaler  failed to get cpu utilization: unable to get metrics for resource cpu: no metrics returned from resource metrics API
    Warning  FailedGetResourceMetric       1m (x42 over 5h)  horizontal-pod-autoscaler  unable to get metrics for resource cpu: no metrics returned from resource metrics API

我正在使用 [ https://github.com/kubernetes-incubator/metrics-server]正如 Kubernetes 文档中所建议的那样。我也尝试过使用 Minikube 做同样的事情。但这也不起作用。

运行 kubectl get --raw /apis/metrics.k8s.io/v1beta1/nodes输出:

{
  "kind": "NodeMetricsList",
  "apiVersion": "metrics.k8s.io/v1beta1",
  "metadata": {
    "selfLink": "/apis/metrics.k8s.io/v1beta1/nodes"
  },
  "items": []
}

Answer 1

解决方案(如果使用 Minikube):

将 Kubernetes 的上下文更改为 Minikube。

在 minikube 中启用 metrics-server 和 Disabled heapster。
minikube addons disable heapsterminikube addons enable metrics-server
使用以下步骤在集群中部署 metrics-server:
git clone https://github.com/kubernetes-incubator/metrics-server.gitcd metrics-serverkubectl create -f deploy/1.7/ (如果 Kubernetes 1.7 版)

或
kubectl create -f deploy/1.8+/ (如果 Kubernetes 版本 1.8+)

开始 minikube dashboad和 minikube service [your service] .

试试 kubectl top node .

我发现这个 ( https://kubernetes.io/docs/tasks/configure-pod-container/assign-memory-resource/ ) 资源很有帮助。