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 kubelet 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

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：

screenshot

访问 grafana

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： https://127.0.0.1:8080/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy

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：https://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： https://127.0.0.1:8086/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy/?orgId=1

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：https://172.27.129.105:8452/?orgId=1

screenshot
参考：

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

kubernetes 部署 heapster 插件