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
1、下载 heapster 文件
到 heapster release 页面 (opens new window)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
2、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: cnych/heapster-grafana-amd64:v4.4.3
67c67
< # type: NodePort
---
> type: NodePort
修改后文件内容如下：
cat grafana.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: monitoring-grafana
namespace: kube-system
spec:
replicas: 1
template:
metadata:
labels:
task: monitoring
k8s-app: grafana
spec:
containers:
- name: grafana
image: cnych/heapster-grafana-amd64:v4.4.3
ports:
- containerPort: 3000
protocol: TCP
volumeMounts:
- mountPath: /etc/ssl/certs
name: ca-certificates
readOnly: true
- mountPath: /var
name: grafana-storage
env:
- name: INFLUXDB_HOST
value: monitoring-influxdb
- name: GF_SERVER_HTTP_PORT
value: "3000"
# The following env variables are required to make Grafana accessible via
# the kubernetes api-server proxy. On production clusters, we recommend
# removing these env variables, setup auth for grafana, and expose the grafana
# service using a LoadBalancer or a public IP.
- name: GF_AUTH_BASIC_ENABLED
value: "false"
- name: GF_AUTH_ANONYMOUS_ENABLED
value: "true"
- name: GF_AUTH_ANONYMOUS_ORG_ROLE
value: Admin
- name: GF_SERVER_ROOT_URL
# If you're only using the API Server proxy, set this value instead:
# value: /api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
value: /
volumes:
- name: ca-certificates
hostPath:
path: /etc/ssl/certs
- name: grafana-storage
emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
labels:
# For use as a Cluster add-on (https://github.com/kubernetes/kubernetes/tree/master/cluster/addons)
# If you are NOT using this as an addon, you should comment out this line.
kubernetes.io/cluster-service: 'true'
kubernetes.io/name: monitoring-grafana
name: monitoring-grafana
namespace: kube-system
spec:
# In a production setup, we recommend accessing Grafana through an external Loadbalancer
# or through a public IP.
# type: LoadBalancer
# You could also use NodePort to expose the service at a randomly-generated port
type: NodePort
ports:
- port: 80
targetPort: 3000
selector:
k8s-app: grafana
- 镜像更改成自己已经 pull 好了的，并且开启 NodePort
cp heapster.yaml{,.orig}
diff heapster.yaml.orig heapster.yaml
23c23
< image: gcr.io/google_containers/heapster-amd64:v1.5.3
---
> image: cnych/heapster-amd64:v1.4.2
27c27
< - --source=kubernetes:https://kubernetes.default
---
> - --source=kubernetes:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250
修改后文件内容如下：
cat heapster.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: heapster
namespace: kube-system
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: heapster
namespace: kube-system
spec:
replicas: 1
template:
metadata:
labels:
task: monitoring
k8s-app: heapster
spec:
serviceAccountName: heapster
containers:
- name: heapster
image: cnych/heapster-amd64:v1.4.2
imagePullPolicy: IfNotPresent
command:
- /heapster
- --source=kubernetes:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250
- --sink=influxdb:http://monitoring-influxdb.kube-system.svc:8086
---
apiVersion: v1
kind: Service
metadata:
labels:
task: monitoring
# For use as a Cluster add-on (https://github.com/kubernetes/kubernetes/tree/master/cluster/addons)
# If you are NOT using this as an addon, you should comment out this line.
kubernetes.io/cluster-service: 'true'
kubernetes.io/name: Heapster
name: heapster
namespace: kube-system
spec:
ports:
- port: 80
targetPort: 8082
selector:
k8s-app: heapster
- 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: cnych/heapster-influxdb-amd64:v1.3.3
修改后文件内容如下：
cat influxdb.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: monitoring-influxdb
namespace: kube-system
spec:
replicas: 1
template:
metadata:
labels:
task: monitoring
k8s-app: influxdb
spec:
containers:
- name: influxdb
image: cnych/heapster-influxdb-amd64:v1.3.3
volumeMounts:
- mountPath: /data
name: influxdb-storage
volumes:
- name: influxdb-storage
emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
labels:
task: monitoring
# For use as a Cluster add-on (https://github.com/kubernetes/kubernetes/tree/master/cluster/addons)
# If you are NOT using this as an addon, you should comment out this line.
kubernetes.io/cluster-service: 'true'
kubernetes.io/name: monitoring-influxdb
name: monitoring-influxdb
namespace: kube-system
spec:
ports:
- port: 8086
targetPort: 8086
selector:
k8s-app: influxdb
3、执行所有定义文件
修改后的文件内容如下：
cat heapster-rbac.yaml
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: heapster
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:heapster
subjects:
- kind: ServiceAccount
name: heapster
namespace: kube-system
---
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
- 将 serviceAccount kube-system:heapster 与 ClusterRole system:kubelet-api-admin 绑定，授予它调用 kubelet API 的权限；
4、检查执行结果
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：
https://172.68.96.110:8443
image.png
5、访问 grafana
1）通过 kube-apiserver 访问
获取 monitoring-grafana 服务 URL：
浏览器访问 URL： https://172.68.96.110:8443/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
2）通过 kubectl proxy 访问：
创建代理
kubectl proxy --address='172.68.96.103' --port=8086 --accept-hosts='^*$'
Starting to serve on 172.68.96.103:8086
浏览器访问 URL：http://172.68.96.103:8086/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 10.254.34.87 80/TCP 12m
monitoring-grafana NodePort 10.254.186.62 80:8654/TCP 12m
monitoring-influxdb ClusterIP 10.254.55.105 8086/TCP 12m
- grafana 监听 NodePort 8654；
浏览器访问 URL：http://172.68.96.101:8654/?orgId=1
那么，这个时候，可以通过如下几种方式访问到 grafana 服务：
- http://172.68.96.101:8654/?orgId=1
- http://172.68.96.102:8654/?orgId=1
- http://172.68.96.103:8654/?orgId=1
- https://172.68.96.110:8443/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
进去之后可以点击一下集群，看看里边的一些信息：
http://172.68.96.101:8654
image.png
6、参考：
1）配置 heapster：https://github.com/kubernetes/heapster/blob/master/docs/source-configuration.md