安装kubernetes1.12.1的 dashboard v1.10 + Heapster-低调大师

安装kubernetes1.12.1的 dashboard v1.10 + Heapster

2018-10-23 825

Dashboard是kubernetes的官方WEB UI。
Heapster为集群添加使用统计和监控功能，为Dashboard添加仪表盘。使用InfluxDB做为Heapster的后端存储。

Dashboard 安装

kubernetes dashboard 官方资源定义文档：https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

注意点：

默认资源定义文档中Service 定义没有使用NodePort，不能服务器外部访问
默认资源定义文档中的权限定义，仅包含了dashboard需要的最小权限，不支持本地访问外的其他方式访问，需要创建身份令牌（Create An Authentication Token）才能独立的提供访问。

通过查看dashboard的定义文档，需要的镜像是k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.0，我们在所有node节点上pull该镜像：

docker pull mirrorgooglecontainers/kubernetes-dashboard-amd64:v1.10.0
docker tag mirrorgooglecontainers/kubernetes-dashboard-amd64:v1.10.0 k8s.gcr.io/kubernetes-dashboard:v1.10.0

使用anbile-playbook，脚本如下：

---
- hosts: slave
  remote_user: root
  tasks:
  - name: copy pull-images-nodes-dashboard.sh to remote nodes
    copy: src=../pull-images-nodes-dashboard.sh  dest=/tmp/pull-images-nodes-dashboard.sh
  - name: pull images for node
    shell: sh /tmp/pull-images-nodes-dashboard.sh

由于之前使用kubeadm安装kubernetes时，均没有-adm64后缀，为保持统一，此时需要修改kubernetes-dashboard.yaml文档中使用的镜像名。

在镜像中添加镜像的拉取策略：imagePullPolicy: IfNotPresent，保证在本地有镜像的情况下不去网络上拉取。

    containers:
      - name: kubernetes-dashboard
        image: k8s.gcr.io/kubernetes-dashboard:v1.10.0
        imagePullPolicy: IfNotPresent

此处，也可以将镜像下载下来后存到本地仓库中，然后将配置的镜像地址改为私有仓库的地址。

Service 外网访问

修改Service 的定义，type为NodePort，如下：

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

dashboard外部访问仅支持https协议。

修改权限配置

默认的角色权限登陆后，会出现如下图的问题：

可以依据实际的使用情况调整kubernetes-dashboard的权限。

主要修改Role 以及RoleBinding两个部分。

注释原kubernetes-dashboard.yml中Role 以及RoleBinding部分。

原RBAC授权是基于namespace的授权（使用的Role 和 RoleBinding），改为基于集群的授权（使用ClusterRole和ClusterRoleBinding）。基于集群授权admin登陆后，可管理整个集群的各个namespace下的资源。但是在实际生产使用中，应该还是区分用户和namespace 授权。

详细的RBAC说明，参考kubernetes 官网：Using RBAC Authorization

授权资源配置改为：

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io

使用kubectl apply -f dashboard/使用新的配置部署kubernetes dashboard。

访问dashboard：登陆https://10.20.13.24:30443。

可查看各类kubernetes集群的资源。

kube-system空间的负载：

完整的kubernetes dashboard 配置参考文末。

启动dashboard

启动dashboard：kubectl apply -f kubernetes-dashboard.yaml

查看pod运行状态：

[root@kuber24 dashboard]# kubectl get pods --all-namespaces -o wide
NAMESPACE     NAME                                   READY   STATUS    RESTARTS   AGE     IP            NODE      NOMINATED NODE
kube-system   coredns-576cbf47c7-75gcc               1/1     Running   0          4d19h   10.1.0.3      kuber24   <none>
kube-system   coredns-576cbf47c7-v242w               1/1     Running   0          4d19h   10.1.0.2      kuber24   <none>
kube-system   etcd-kuber24                           1/1     Running   2          4d19h   10.20.13.24   kuber24   <none>
kube-system   kube-apiserver-kuber24                 1/1     Running   1          4d19h   10.20.13.24   kuber24   <none>
kube-system   kube-controller-manager-kuber24        1/1     Running   2          4d19h   10.20.13.24   kuber24   <none>
kube-system   kube-flannel-ds-6hqc4                  1/1     Running   0          3d19h   10.20.13.25   kuber25   <none>
kube-system   kube-flannel-ds-bs4b7                  1/1     Running   0          3d19h   10.20.13.27   kuber27   <none>
kube-system   kube-flannel-ds-gwcj5                  1/1     Running   0          4d16h   10.20.13.24   kuber24   <none>
kube-system   kube-flannel-ds-tmsbc                  1/1     Running   0          3d19h   10.20.13.26   kuber26   <none>
kube-system   kube-proxy-fqm89                       1/1     Running   0          3d19h   10.20.13.27   kuber27   <none>
kube-system   kube-proxy-nd875                       1/1     Running   2          4d19h   10.20.13.24   kuber24   <none>
kube-system   kube-proxy-qsf9z                       1/1     Running   0          3d19h   10.20.13.25   kuber25   <none>
kube-system   kube-proxy-ww8x7                       1/1     Running   0          3d19h   10.20.13.26   kuber26   <none>
kube-system   kube-scheduler-kuber24                 1/1     Running   2          4d19h   10.20.13.24   kuber24   <none>
kube-system   kubernetes-dashboard-68bbb49dc-kl5gn   1/1     Running   0          16s     10.1.3.2      kuber27   <none>

dashboard的访问地址为：https://<master-ip>:<dashboard-nodeport>

如果发生ErrImagePull，先查看pod部署的物理节点是否有dashboard镜像，然后确定镜像名和版本信息等是否与yml定义一致。

使用kubectl get secret --all-namespaces|grep dashboard查看dashboard关联的身份令牌token。

[root@kuber24 dashboard]# kubectl get Secret --all-namespaces|grep dashboard
kube-system   kubernetes-dashboard-certs                       Opaque                                0      152m
kube-system   kubernetes-dashboard-key-holder                  Opaque                                2      75m
kube-system   kubernetes-dashboard-token-9msgn                 kubernetes.io/service-account-token   3      152m
[root@kuber24 dashboard]# kubectl describe secret/kubernetes-dashboard-token-9msgn -n kube-system
Name:         kubernetes-dashboard-token-9msgn
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: kubernetes-dashboard
              kubernetes.io/service-account.uid: 43b5fdcf-d67d-11e8-8f15-00259029d7a2

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1025 bytes
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.LjBwNW93Gn-XRmJvkpHpPkpYhE3v7CB3Vm5GE1VvXRDSMtme7q7K-E522BS__I6BCqLTtmncN1rSkEYtBKgmfhUf6UhABL3vW8zoPYneFZINrcWA1wrlLx5TlIIcdDLVGrWQUbv3X5NYVfP-yhCuLMv7K3glXa01-B6L8Mgm8EiuMJqZ6ypiGUySl3dLld0vu4reT5fIHgipziuChZWLrYd2mPHXNesVv4UHw_UGASD0-CCEtMvTZ5Bgvs3IP278qOw8AyAioBDNMjPTqri4MDBbkzuXjmXhBiknA6yBDYD4piBt_cjVWq6diTwV2veFCiGMxfetz36AkgMFSSQjKA

其中前面是kubernetes dashboard 的默认安装的token。

Heapster 安装

heapster 依赖 influxdb，下载heapster运行的配置资源定义文档和授权定义文档。

mkdir heapster
cd heapster
wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/grafana.yaml
wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/heapster.yaml
wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/influxdb/influxdb.yaml
wget https://raw.githubusercontent.com/kubernetes/heapster/master/deploy/kube-config/rbac/heapster-rbac.yaml

准备镜像

查看资源定义文档，找到需要使用的镜像，如下：

k8s.gcr.io/heapster-grafana-amd64:v5.0.4
k8s.gcr.io/heapster-amd64:v1.5.4
k8s.gcr.io/heapster-influxdb-amd64:v1.5.2

使用脚本在node上pull镜像：

#!/bin/bash
images=(kube-proxy-amd64:v1.12.1 pause-amd64:3.1 kubernetes-dashboard-amd64:v1.10.0 heapster-grafana-amd64:v5.0.4 heapster-amd64:v1.5.4 heapster-influxdb-amd64:v1.5.2)
for imageName in ${images[@]} ; do
  docker pull mirrorgooglecontainers/$imageName
  if [[ $imageName =~ "amd64" ]]; then
    docker tag mirrorgooglecontainers/$imageName "k8s.gcr.io/${imageName//-amd64/}"
  else
    docker tag mirrorgooglecontainers/$imageName k8s.gcr.io/$imageName
  fi
  # docker rmi mirrorgooglecontainers/$imageName
done

由于之前使用kubeadm安装kubernetes时，均没有-adm64后缀，为保持统一，此时需要修改kubernetes-dashboard.yaml文档中使用的镜像名。

在上文创建的heapster文件夹上级目录，运行：

kubectl apply -f ./heapster/

删除kubernetes dashboard 的相关资源

使用官方的kubernetes dashboard 配置后，登陆系统没有任何的权限，需要更改权限。更改前，清理之前配置和运行的资源。

删除secret：kubectl delete secret $(kubectl get secret -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
删除ServiceAccount：kubectl delete ServiceAccount $(kubectl get ServiceAccount -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
删除Role：kubectl delete Role $(kubectl get Role -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
删除RoleBinding：kubectl delete RoleBinding $(kubectl get RoleBinding -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
删除Deployment：kubectl delete Deployment $(kubectl get Deployment -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
删除Service：kubectl delete Service $(kubectl get Service -n kube-system|grep dashboard| awk '{print $1}') -n kube-system

清理：

kubectl delete secret $(kubectl get secret -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
kubectl delete ServiceAccount  $(kubectl get ServiceAccount -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
kubectl delete Role  $(kubectl get Role -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
kubectl delete RoleBinding  $(kubectl get RoleBinding -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
kubectl delete RoleBinding  $(kubectl get RoleBinding -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
kubectl delete Deployment  $(kubectl get Deployment -n kube-system|grep dashboard| awk '{print $1}') -n kube-system
kubectl delete Service  $(kubectl get Service -n kube-system|grep dashboard| awk '{print $1}') -n kube-system

完整的kubernetes dashboard 配置

# Copyright 2017 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# ------------------- Dashboard Secret ------------------- #

apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-certs
  namespace: kube-system
type: Opaque

---
# ------------------- Dashboard Service Account ------------------- #

apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system

---
# # ------------------- Dashboard Role & Role Binding ------------------- #
#
# kind: Role
# apiVersion: rbac.authorization.k8s.io/v1
# metadata:
#   name: kubernetes-dashboard-minimal
#   namespace: kube-system
# rules:
#   # Allow Dashboard to create 'kubernetes-dashboard-key-holder' secret.
# - apiGroups: [""]
#   resources: ["secrets"]
#   verbs: ["create"]
#   # Allow Dashboard to create 'kubernetes-dashboard-settings' config map.
# - apiGroups: [""]
#   resources: ["configmaps"]
#   verbs: ["create"]
#   # Allow Dashboard to get, update and delete Dashboard exclusive secrets.
# - apiGroups: [""]
#   resources: ["secrets"]
#   resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs"]
#   verbs: ["get", "update", "delete"]
#   # Allow Dashboard to get and update 'kubernetes-dashboard-settings' config map.
# - apiGroups: [""]
#   resources: ["configmaps"]
#   resourceNames: ["kubernetes-dashboard-settings"]
#   verbs: ["get", "update"]
#   # Allow Dashboard to get metrics from heapster.
# - apiGroups: [""]
#   resources: ["services"]
#   resourceNames: ["heapster"]
#   verbs: ["proxy"]
# - apiGroups: [""]
#   resources: ["services/proxy"]
#   resourceNames: ["heapster", "http:heapster:", "https:heapster:"]
#   verbs: ["get"]
#
# ---
# apiVersion: rbac.authorization.k8s.io/v1
# kind: RoleBinding
# metadata:
#   name: kubernetes-dashboard-minimal
#   namespace: kube-system
# roleRef:
#   apiGroup: rbac.authorization.k8s.io
#   kind: Role
#   name: kubernetes-dashboard-minimal
# subjects:
# - kind: ServiceAccount
#   name: kubernetes-dashboard
#   namespace: kube-system
#
---
# ---------- Dashboard ClusterRole & ClusterRoleBinding --------- #

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io
  
---
# ------------------- Dashboard Deployment ------------------- #

kind: Deployment
apiVersion: apps/v1beta2
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      containers:
      - name: kubernetes-dashboard
        image: k8s.gcr.io/kubernetes-dashboard:v1.10.0
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8443
          protocol: TCP
        args:
          - --auto-generate-certificates
          # Uncomment the following line to manually specify Kubernetes API server Host
          # If not specified, Dashboard will attempt to auto discover the API server and connect
          # to it. Uncomment only if the default does not work.
          # - --apiserver-host=http://my-address:port
        volumeMounts:
        - name: kubernetes-dashboard-certs
          mountPath: /certs
          # Create on-disk volume to store exec logs
        - mountPath: /tmp
          name: tmp-volume
        livenessProbe:
          httpGet:
            scheme: HTTPS
            path: /
            port: 8443
          initialDelaySeconds: 30
          timeoutSeconds: 30
      volumes:
      - name: kubernetes-dashboard-certs
        secret:
          secretName: kubernetes-dashboard-certs
      - name: tmp-volume
        emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
      - key: node-role.kubernetes.io/master
        effect: NoSchedule

---
# ------------------- Dashboard Service ------------------- #

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30443
  selector:
    k8s-app: kubernetes-dashboard

参考

最后

感谢大家的阅读，如果有什么疑问️，请您留言。

欢迎大家来我的github，查看更多关于kubernetes的个人经验，共同进步。

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原文链接：https://my.oschina.net/hgfdoing/blog/2251419

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