Kubernetes的UI界面Kubernetes Dashboard的搭建

1、搭建准备

Kubernetes集群的安装部署

2、搭建过程

2.1、在master节点上创建kubernetes-dashboard.yaml

cd /etc/kubernetes
vim kubernetes-dashboard.yaml

# Copyright 2015 Google Inc. All Rights Reserved.
#
# 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.

# Configuration to deploy release version of the Dashboard UI.
#
# Example usage: kubectl create -f <this_file>

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  labels:
    app: kubernetes-dashboard
    version: v1.1.1
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  replicas: 1
  selector:
    matchLabels:
      app: kubernetes-dashboard
  template:
    metadata:
      labels:
        app: kubernetes-dashboard
    spec:
      containers:
      - name: kubernetes-dashboard
        image: daocloud.io/minunix/kubernetes-dashboard-amd64:v1.1.1
        imagePullPolicy: Always
        ports:
        - containerPort: 9090
          protocol: TCP
        args:
          # 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://192.168.44.60:8080
        livenessProbe:
          httpGet:
            path: /
            port: 9090
          initialDelaySeconds: 30
          timeoutSeconds: 30
---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 9090
  selector:
    app: kubernetes-dashboard

2.2、下载pod-infrastructure镜像（每个节点上都需要）

上篇文章中/etc/kubernetes/kubelet文件配置中，有一项配置需要docker的registry.access.redhat.com/rhel7/pod-infrastructure:latest镜像，所以我们先pull下来

先yum安装rhsm

yum install *rhsm* -y

然后下载镜像

docker pull registry.access.redhat.com/rhel7/pod-infrastructure:latest

如果执行上一步报错，就执行以下两步，生成/etc/rhsm/ca/redhat-uep.pem这个文件，然后再执行上一步

wget http://mirror.centos.org/centos/7/os/x86_64/Packages/python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm
rpm2cpio python-rhsm-certificates-1.19.10-1.el7_4.x86_64.rpm | cpio -iv --to-stdout ./etc/rhsm/ca/redhat-uep.pem | tee /etc/rhsm/ca/redhat-uep.pem

2.3、创建Kubernetes Dashboard

在master节点上执行

[root@k8s-master kubernetes]# kubectl create -f kubernetes-dashboard.yaml

执行以下命令，查看是否成功

[root@k8s-master kubernetes]# kubectl get pods --all-namespaces
NAMESPACE     NAME                                   READY     STATUS    RESTARTS   AGE
kube-system   kubernetes-dashboard-878342739-f8nhb   1/1       Running   0          1h

如果上面的status为running，则成功，如果不是的话就需要查看详细信息，看是哪里出错

[root@k8s-master kubernetes]# kubectl describe pods kubernetes-dashboard-878342739-f8nhb  --namespace="kube-system"

2.4、访问UI界面

http://k8s-master:8080/ui

可能会出现以下错误，页面上报错

Error: 'dial tcp 172.17.78.2:9090: getsockopt: connection timed out'
Trying to reach: 'http://172.17.78.2:9090/'

如果出现以上错误，执行以下命令（每台机器都执行一遍）

iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -F
iptables -L -n

然后再访问UI界面

ojbk。