kubernetes云平台管理实战：部署heapster监控（十七）

一、实验准备

1、文件结构与组成

[root@master heapster-influxdb]# ll
total 20
-rw-r--r-- 1 root root  414 May 13 16:35 grafana-service.yaml
-rw-r--r-- 1 root root  694 May 21 12:14 heapster-controller.yaml
-rw-r--r-- 1 root root  249 May 13 16:36 heapster-service.yaml
-rw-r--r-- 1 root root 1627 May 13 17:19 influxdb-grafana-controller.yaml
-rw-r--r-- 1 root root  259 May 13 16:37 influxdb-service.yaml

2、具体内容

grafana-service.yaml

[root@master heapster-influxdb]# cat grafana-service.yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    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
  ports:
  - port: 80
    targetPort: 3000
  selector:
    name: influxGrafana

heapster-controller.yaml

[root@master heapster-influxdb]# cat heapster-controller.yaml
apiVersion: v1
kind: ReplicationController
metadata:
  labels:
    k8s-app: heapster
    name: heapster
    version: v6
  name: heapster
  namespace: kube-system
spec:
  replicas: 1
  selector:
    k8s-app: heapster
    version: v6
  template:
    metadata:
      labels:
        k8s-app: heapster
        version: v6
    spec:
      nodeSelector:
         kubernetes.io/hostname: master
      containers:
      - name: heapster
        image: 192.168.118.18:5000/heapster:canary
        imagePullPolicy: IfNotPresent
        command:
        - /heapster
        - --source=kubernetes:http://192.168.118.18:8080?inClusterConfig=false
        - --sink=influxdb:http://monitoring-influxdb:8086

heapster-service.yaml

[root@master heapster-influxdb]# cat heapster-service.yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    kubernetes.io/cluster-service: 'true'
    kubernetes.io/name: Heapster
  name: heapster
  namespace: kube-system
spec:
  ports:
  - port: 80
    targetPort: 8082
  selector:
    k8s-app: heapster

influxdb-grafana-controller.yaml

[root@master heapster-influxdb]# cat influxdb-grafana-controller.yaml
apiVersion: v1
kind: ReplicationController
metadata:
  labels:
    name: influxGrafana
  name: influxdb-grafana
  namespace: kube-system
spec:
  replicas: 1
  selector:
    name: influxGrafana
  template:
    metadata:
      labels:
        name: influxGrafana
    spec:
      containers:
      - name: influxdb
        image: 192.168.118.18:5000/heapster_influxdb:v0.5
        imagePullPolicy: IfNotPresent
        volumeMounts:
        - mountPath: /data
          name: influxdb-storage
      - name: grafana
        imagePullPolicy: IfNotPresent
        image: 192.168.118.18:5000/heapster_grafana:v2.6.0
        env:
          - name: INFLUXDB_SERVICE_URL
            value: http://monitoring-influxdb:8086
            # 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
            value: /api/v1/proxy/namespaces/kube-system/services/monitoring-grafana/
        volumeMounts:
        - mountPath: /var
          name: grafana-storage
      nodeSelector:
         kubernetes.io/hostname: 192.168.118.18
      volumes:
      - name: influxdb-storage
        emptyDir: {}
      - name: grafana-storage
        emptyDir: {}

influxdb-service.yaml

[root@master heapster-influxdb]# cat influxdb-service.yaml
apiVersion: v1
kind: Service
metadata:
  labels: null
  name: monitoring-influxdb
  namespace: kube-system
spec:
  ports:
  - name: http
    port: 8083
    targetPort: 8083
  - name: api
    port: 8086
    targetPort: 8086
  selector:
    name: influxGrafana

镜像仓库

[root@master dashboard]# docker images
REPOSITORY                                                         TAG                 IMAGE ID            CREATED             SIZE
192.168.118.18:5000/heapster_influxdb                              v0.5                a47993810aac        4 years ago         251 MB
192.168.118.18:5000/heapster_grafana                               v2.6.0              4fe73eb13e50        4 years ago         267 MB
192.168.118.18:5000/heapster                                       canary              0a56f7040da5        3 years ago         971 MB

二、操作演示过程

1、安装部署检查

创建数据库容器

[root@master pod]# kubectl create -f heapster-influxdb/
service "monitoring-grafana" created
replicationcontroller "heapster" created
service "heapster" created
replicationcontroller "influxdb-grafana" created
service "monitoring-influxdb" created

  检查

[root@master ~]# kubectl get pod -o wide --all-namespaces|grep kube-system
kube-system   heapster-hrfmb                                 1/1       Running   0          5s        172.16.56.3   192.168.118.18
kube-system   influxdb-grafana-0lj0n                         2/2       Running   0          4s        172.16.56.4   192.168.118.18
kube-system   kube-dns-1835838994-jm5bk                      4/4       Running   0          6h        172.16.99.3   192.168.118.20
kube-system   kubernetes-dashboard-latest-2728556226-fc2pc   1/1       Running   0          5h        172.16.60.6   192.168.118.19

2、遇到的坑

状态查看

[root@master pod]# kubectl get svc --namespace=kube-system
NAME                   CLUSTER-IP       EXTERNAL-IP   PORT(S)             AGE
heapster               10.254.31.250            80/TCP              1m
kube-dns               10.254.230.254           53/UDP,53/TCP       4h
kubernetes-dashboard   10.254.245.38            80/TCP              3h
monitoring-grafana     10.254.153.72            80/TCP              1m
monitoring-influxdb    10.254.137.174           8083/TCP,8086/TCP   1m
[root@master pod]# kubectl get pod -n kube-system
NAME                                           READY     STATUS    RESTARTS   AGE
heapster-2l264                                 0/1       Pending   0          1m
influxdb-grafana-j602n                         0/2       Pending   0          1m
kube-dns-1835838994-jm5bk                      4/4       Running   0          4h
kubernetes-dashboard-latest-2728556226-fc2pc   1/1       Running   0          2h

错误信息

[root@master pod]# kubectl describe pods heapster-lq553 --namespace=kube-system
Name:		heapster-lq553
......
Events:
  FirstSeen	LastSeen	Count	From			SubObjectPath	Type		Reason			Message
  ---------	--------	-----	----			-------------	--------	------			-------
  26m		23s		92	{default-scheduler }			Warning		FailedScheduling	pod (heapster-lq553) failed to fit in any node
fit failure summary on nodes : MatchNodeSelector (2)

处理方法

    spec:
      nodeSelector:
         kubernetes.io/hostname: master  #这里一定要和自己的节点hostnam保持一致

3、nodeSelector

labels 在 K8s 中是一个很重要的概念，作为一个标识，Service、Deployments 和 Pods 之间的关联都是通过 label 来实现的。而每个节点也都拥有 label，通过设置 label 相关的策略可以使得 pods 关联到对应 label 的节点上。

nodeSelector 是最简单的约束方式。 nodeSelector 是  PodSpec 的一个字段。

通过 --show-labels 可以查看当前 nodes 的labelsctl get all
......

NAME                        READY     STATUS              RESTARTS   AGE
po/mysql-3qkf1              1/1       Running             0          15h
po/myweb-z2g3m              1/1       Running             0          15h

三、测试

 四、监控的信息来源在哪里

 1、从架构图中看来源的组件

 2、配置/etc/kubernetes/kubelet开启cadvisor

vim /etc/kubernetes/kubelet
修改21行如下：--cadvisor-port=8080 
KUBELET_ARGS="--cluster_dns=10.254.230.254 --cluster_domain=cluster.local --cadvisor-port=8080"

重启服务

systemctl restart kubelet.service
systemctl restart kube-proxy.service

3、web页面截图

浏览器地址栏输入：

http://192.168.118.19:8080/containers/

总览

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