在kubernetes中安装heapster或指标服务器，用于水平pod自动伸缩

Question

如何在kubernetes中安装heapster或指标服务器来获取pod指标。我需要这些pod指标来使用它来水平pod自动缩放。我使用的是数字海洋云群。部署文件在下面的屏幕截图中

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Answer 1

您需要先下载以下文件：

curl https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/grafana.yaml > grafana.yaml
curl https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/heapster.yaml > heapster.yaml
curl https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/influxdb.yaml > influxdb.yaml
curl https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/rbac/heapster-rbac.yaml > heapster-rbac.yaml

然后创建如下grafana、influxdb和heapster的服务实例：

$ kubectl create -f grafana.yaml
deployment "monitoring-grafana" created
service "monitoring-grafana" created

$ kubectl create -f heapster.yaml
serviceaccount "heapster" created
deployment "heapster" created
service "heapster" created

$ kubectl create -f influxdb.yaml
deployment "monitoring-influxdb" created
service "monitoring-influxdb" created

$ kubectl create -f heapster-rbac.yaml
clusterrolebinding "heapster" created

按照以下教程测试您的自动伸缩pods：

https://developer.ibm.com/tutorials/autoscale-application-on-kubernetes-cluster/

希望这能有所帮助。

编辑:部署文件中的资源请求：

apiVersion: v1
kind: Pod
metadata:
  name: frontend
spec:
  containers:
  - name: db
    image: mysql
    env:
    - name: MYSQL_ROOT_PASSWORD
      value: "password"
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"
  - name: wp
    image: wordpress
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"    

资源和请求应该在您的部署文件中，以便HPA可以访问它以自动缩放。

Answer 2

在最新的Kubernetes中，不推荐使用Heapster。从Heapster获取指标从Kubernetes 1.11开始被弃用。

使用metrics进行安装-服务器对我很有效：

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

来源：

• https://kubernetes.io/docs/tasks/debug-application-cluster/resource-metrics-pipeline/#metrics-server
• https://github.com/kubernetes-sigs/metrics-server