09-3.部署 heapster 插件

Heapster是一个收集者，将每个Node上的cAdvisor的数据进行汇总，然后导到第三方工具(如InfluxDB)。

Heapster 是通过调用 kubelet 的 http API 来获取 cAdvisor 的 metrics 数据的。

由于 kublet 只在 10250 端口接收 https 请求，故需要修改 heapster 的 deployment 配置。同时，需要赋予 kube-system:heapster ServiceAccount 调用 kubelet API 的权限。

下载 heapster 文件

到 heapster release 页面 下载最新版本的 heapster

  1. wget https://github.com/kubernetes/heapster/archive/v1.5.3.tar.gz
  2. tar -xzvf v1.5.3.tar.gz
  3. mv v1.5.3.tar.gz heapster-1.5.3.tar.gz

官方文件目录： heapster-1.5.3/deploy/kube-config/influxdb

修改配置

  1. $ cd heapster-1.5.3/deploy/kube-config/influxdb
  2. $ cp grafana.yaml{,.orig}
  3. $ diff grafana.yaml.orig grafana.yaml
  4. 16c16
  5. <         image: gcr.io/google_containers/heapster-grafana-amd64:v4.4.3
  6. ---
  7. >         image: wanghkkk/heapster-grafana-amd64-v4.4.3:v4.4.3
  8. 67c67
  9. <   # type: NodePort
  10. ---
  11. >   type: NodePort
  • 开启 NodePort；
  1. $ cp heapster.yaml{,.orig}
  2. $ diff heapster.yaml.orig heapster.yaml
  3. 23c23
  4. <         image: gcr.io/google_containers/heapster-amd64:v1.5.3
  5. ---
  6. >         image: fishchen/heapster-amd64:v1.5.3
  7. 27c27
  8. <         - --source=kubernetes:https://kubernetes.default
  9. ---
  10. >         - --source=kubernetes:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250
  • 由于 kubelet 只在 10250 监听 https 请求，故添加相关参数；
  1. $ cp influxdb.yaml{,.orig}
  2. $ diff influxdb.yaml.orig influxdb.yaml
  3. 16c16
  4. <         image: gcr.io/google_containers/heapster-influxdb-amd64:v1.3.3
  5. ---
  6. >         image: fishchen/heapster-influxdb-amd64:v1.3.3

执行所有定义文件

  1. $ pwd
  2. /opt/k8s/heapster-1.5.2/deploy/kube-config/influxdb
  3. $ ls *.yaml
  4. grafana.yaml  heapster.yaml  influxdb.yaml
  5. $ kubectl create -f  .
  7. $ cd ../rbac/
  8. $ pwd
  9. /opt/k8s/heapster-1.5.2/deploy/kube-config/rbac
  10. $ ls
  11. heapster-rbac.yaml
  12. $ cp heapster-rbac.yaml{,.orig}
  13. $ diff heapster-rbac.yaml.orig heapster-rbac.yaml
  14. 12a13,26
  15. > ---
  16. > kind: ClusterRoleBinding
  17. > apiVersion: rbac.authorization.k8s.io/v1beta1
  18. > metadata:
  19. >   name: heapster-kubelet-api
  20. > roleRef:
  21. >   apiGroup: rbac.authorization.k8s.io
  22. >   kind: ClusterRole
  23. >   name: system:kubelet-api-admin
  24. > subjects:
  25. > - kind: ServiceAccount
  26. >   name: heapster
  27. >   namespace: kube-system
  28. >
  30. $ kubectl create -f heapster-rbac.yaml
  • 将 serviceAccount kube-system:heapster 与 ClusterRole system:kubelet-api-admin 绑定，授予它调用 kubelet API 的权限；

检查执行结果

  1. $ kubectl get pods -n kube-system | grep -E 'heapster|monitoring'
  2. heapster-ddb6c4994-vnnrn                1/1       Running   0          1m
  3. monitoring-grafana-779bd4dd7b-xqkgk     1/1       Running   0          1m
  4. monitoring-influxdb-f75847d48-2lnz6     1/1       Running   0          1m

检查 kubernets dashboard 界面，可以正确显示各 Nodes、Pods 的 CPU、内存、负载等统计数据和图表：

dashboard-heapster

访问 grafana

  1. 通过 kube-apiserver 访问：

    获取 monitoring-grafana 服务 URL：

    1.  $ kubectl cluster-info
    2.  Kubernetes master is running at https://172.27.129.105:6443
    3.  CoreDNS is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/coredns:dns/proxy
    4.  Heapster is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/heapster/proxy
    5.  kubernetes-dashboard is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy
    6.  monitoring-grafana is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
    7.  monitoring-influxdb is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/monitoring-influxdb/proxy
    9.  To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

    浏览器访问 URL： https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy 对于 virtuabox 做了端口映射： http://127.0.0.1:8080/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy

  2. 通过 kubectl proxy 访问：

    创建代理

    1.  kubectl proxy --address='172.27.129.105' --port=8086 --accept-hosts='^*$'
    2.  Starting to serve on 172.27.129.80:8086

    浏览器访问 URL：http://172.27.129.105:8086/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy/?orgId=1 对于 virtuabox 做了端口映射： http://127.0.0.1:8086/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy/?orgId=1

  3. 通过 NodePort 访问：

    1.  $ kubectl get svc -n kube-system|grep -E 'monitoring|heapster'
    2.  heapster               ClusterIP   10.254.58.136    <none>        80/TCP          47m
    3.  monitoring-grafana     NodePort    10.254.28.196    <none>        80:8452/TCP     47m
    4.  monitoring-influxdb    ClusterIP   10.254.138.164   <none>        8086/TCP        47m

    • grafana 监听 NodePort 8452；

      浏览器访问 URL：http://172.27.129.105:8452/?orgId=1

grafana

参考：

  1. 配置 heapster：https://github.com/kubernetes/heapster/blob/master/docs/source-configuration.md