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

heapster release 页面 下载最新版本的 heapster

wget https://github.com/kubernetes/heapster/archive/v1.5.3.tar.gz
tar -xzvf v1.5.3.tar.gz
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

$ cd heapster-1.5.3/deploy/kube-config/influxdb
$ cp grafana.yaml{,.orig}
$ diff grafana.yaml.orig grafana.yaml
16c16
<         image: gcr.io/google_containers/heapster-grafana-amd64:v4.4.3
---
>         image: wanghkkk/heapster-grafana-amd64-v4.4.3:v4.4.3
67c67
<   # type: NodePort
---
>   type: NodePort
  • 开启 NodePort;
$ cp heapster.yaml{,.orig}
$ diff heapster.yaml.orig heapster.yaml
23c23
<         image: gcr.io/google_containers/heapster-amd64:v1.5.3
---
>         image: fishchen/heapster-amd64:v1.5.3
27c27
<         - --source=kubernetes:https://kubernetes.default
---
>         - --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;
$ cp influxdb.yaml{,.orig}
$ diff influxdb.yaml.orig influxdb.yaml
16c16
<         image: gcr.io/google_containers/heapster-influxdb-amd64:v1.3.3
---
>         image: fishchen/heapster-influxdb-amd64:v1.3.3

执行所有定义文件

$ pwd
/opt/k8s/heapster-1.5.2/deploy/kube-config/influxdb
$ ls *.yaml
grafana.yaml  heapster.yaml  influxdb.yaml
$ kubectl create -f  .

$ cd ../rbac/
$ pwd
/opt/k8s/heapster-1.5.2/deploy/kube-config/rbac
$ ls
heapster-rbac.yaml
$ cp heapster-rbac.yaml{,.orig}
$ diff heapster-rbac.yaml.orig heapster-rbac.yaml
12a13,26
> ---
> kind: ClusterRoleBinding
> apiVersion: rbac.authorization.k8s.io/v1beta1
> metadata:
>   name: heapster-kubelet-api
> roleRef:
>   apiGroup: rbac.authorization.k8s.io
>   kind: ClusterRole
>   name: system:kubelet-api-admin
> subjects:
> - kind: ServiceAccount
>   name: heapster
>   namespace: kube-system
>

$ 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

$ kubectl get pods -n kube-system | grep -E 'heapster|monitoring'
heapster-ddb6c4994-vnnrn                1/1       Running   0          1m
monitoring-grafana-779bd4dd7b-xqkgk     1/1       Running   0          1m
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
图片 - dashboard-heapster

访问 grafana

  1. 通过 kube-apiserver 访问:

    获取 monitoring-grafana 服务 URL:

     $ kubectl cluster-info
     Kubernetes master is running at https://172.27.129.105:6443
     CoreDNS is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/coredns:dns/proxy
     Heapster is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/heapster/proxy
     kubernetes-dashboard is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy
     monitoring-grafana is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
     monitoring-influxdb is running at https://172.27.129.105:6443/api/v1/namespaces/kube-system/services/monitoring-influxdb/proxy
    
     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

     kubectl proxy --address='172.27.129.105' --port=8086 --accept-hosts='^*$'
     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:

     $ kubectl get svc -n kube-system|grep -E 'monitoring|heapster'
     heapster               ClusterIP   10.254.58.136    <none>        80/TCP          47m
     monitoring-grafana     NodePort    10.254.28.196    <none>        80:8452/TCP     47m
     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
图片 - grafana

参考:

  1. 配置 heapster:https://github.com/kubernetes/heapster/blob/master/docs/source-configuration.md
zhangjun            最后更新: 2018-10-18 04:04:02

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