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Kubernetes集群部署教程四·Dashboard控制面板

Kubernetes(k8s)是Google开源的一个容器编排引擎,它支持自动化部署、大规模可伸缩、应用容器化管理,具备可移植、可扩展、自动化等特点。

通过 Kubernetes Dashboard 不仅可以很直观地查看各种资源信息、日志信息、系统资源使用等,还可以创建容器应用、管理资源、更新资源文件等等。

0x01 部署Dashboard

Kubernetes默认会把Pods分布到Worker节点,但我还是喜欢把Dashboard部署在Master节点上:

kubectl label nodes k8sm01 k8sm02 k8sm03 master=master

获取默认配置文件:

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta6/aio/deploy/recommended.yaml

外部网络访问无法访问使用默认配置创建的控制面板,因此需要对配置文件进行一些调整:

...

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
### 新增 ###
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
### 新增 ###
      nodePort: 30080
  selector:
    k8s-app: kubernetes-dashboard
...

kind: ConfigMap
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      containers:
        - name: kubernetes-dashboard
          image: kubernetesui/dashboard:v2.0.0
### 注释 ###
          #imagePullPolicy: Always
...

kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
...
      nodeSelector:
### 修改 ###
        "master": master
      # Comment the following tolerations if Dashboard must not be deployed on master
...

kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
...
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
...

### 追加 ###

---

### Dashbboard账户 ###
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: dashboard-admin
  namespace: kubernetes-dashboard
---

### Dashbboard权限 ###
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: dashboard-admin-bind-cluster-role
  labels:
    k8s-app: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: dashboard-admin
  namespace: kubernetes-dashboard

本人有已修改好的配置文件,可点击此处下载后创建Dashboard:

kubectl apply -f dashboard2.yaml

通过以下命令获取登录dashboard的token:

kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep dashboard-admin | awk '{print $1}')

最后访问Dashboard,比如https://10.10.200.200:30080,使用刚获取到的token即可登录。

0x02 集成Heapster

通过Heapster插件图形化展现集群度量指标信息。

cd /opt/kubenetes/

git clone https://github.com/kubernetes/heapster.git

ll deploy/kube-config/influxdb/

以上目录中的yaml文件分别对应heapster、influxdb和grafana,通过以下脚本拉取相应的镜像:

#!/bin/bash

images=(heapster-amd64:v1.5.4 heapster-influxdb-amd64:v1.5.2 heapster-grafana-amd64:v5.0.4)

for image in ${images[@]}
do
  docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/${image}
  docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/${image} k8s.gcr.io/${image}
done

参照配置文件说明修改yaml文件(本文略),然后启动服务:

kubectl create -f deploy/kube-config/influxdb/

# 删除服务

# kubectl delete -f deploy/kube-config/influxdb/

kubectl get pods -n kube-system

如果顺利,视数据量等待n分钟,就可以通过dashboard看到图形化的集群度量指标信息。如果一直没有图形化,请检查heapster.yaml配置是否正确。

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