Centos7 单节点上安装kubernetes-dashboard过程详解架构师

主机ip地址：10.200.3.81

系统版本：

[[email protected] ~]# cat /etc/redhat-release  
CentOS Linux release 7.4.1708 (Core)

1、配置yum源：

[[email protected] ~]# cat >/etc/yum.repos.d/kubernetes.repo<<-EOF  
[virt7-docker-common-release]  
name=virt7-docker-common-release  
baseurl=http://cbs.centos.org/repos/virt7-docker-common-release/x86_64/os/  
gpgcheck=0  
EOF

2、查看当前yum里的Kubernetes版本：

[[email protected] ~]# yum info kubernetes 
Loaded plugins: fastestmirror, langpacks 
Loading mirror speeds from cached hostfile 
 * base: mirrors.shu.edu.cn 
 * extras: ftp.tsukuba.wide.ad.jp 
 * updates: mirrors.shu.edu.cn 
Installed Packages 
Name        : kubernetes 
Arch        : x86_64 
Version     : 1.5.2 
Release     : 0.7.git269f928.el7 
Size        : 0.0   
Repo        : installed 
From repo   : extras 
Summary     : Container cluster management 
URL         : k8s.io/kubernetes 
License     : ASL 2.0 
Description : Container cluster management

3、安装所需要的包：

[[email protected] ~]# yum -y install --enablerepo=virt7-docker-common-release kubernetes etcd

4、配置文件的修改：

修改配置文件：/etc/kubernetes/apiserver

KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"     #这里把127.0.0.1改成0.0.0.0  
  
KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,Security  
ContextDeny,ResourceQuota"       
#去掉ServiceAccount即可；

5、查看docker的版本：[上面命令并没有加入docker，但它却自动安装了]

[[email protected] ~]#docker version  
Client: 
 Version:         1.13.1 
 API version:     1.26 
 Package version: <unknown> 
 Go version:      go1.8.3 
 Git commit:      774336d/1.13.1 
 Built:           Wed Mar  7 17:06:16 2018 
 OS/Arch:         linux/amd64 
 
Server: 
 Version:         1.13.1 
 API version:     1.26 (minimum version 1.12) 
 Package version: <unknown> 
 Go version:      go1.8.3 
 Git commit:      774336d/1.13.1 
 Built:           Wed Mar  7 17:06:16 2018 
 OS/Arch:         linux/amd64 
 Experimental:    false

6、把服务添加到启动项，并启动服务：

for SERVICE in docker etcd kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet; do   
  
    systemctl start $SERVICE  
    systemctl enable $SERVICE  
  
done

7、验证安装成果：

#当前主机上没有任何镜像，接下来我们创建一个pod实例；

[[email protected] ~]# docker images  
  
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

使用kubectl命令创建一个nginx实例:

创建之前先docker pull nginx一个镜像到本地:

命令行创建nginx pods

[[email protected] ~]#kubectl run my-nginx --image=nginx --replicas=1 --port=80

命令行创建service

# kubectl expose deployment my-nginx --port=8888 --target-port=80 --external-ip=10.200.3.81

查看pod实例分配的Ip地址；

[[email protected] ~]# kubectl get pods -o wide 
NAME                       READY     STATUS    RESTARTS   AGE       IP           NODE 
my-nginx-379829228-mpm5f   1/1       Running   0          51m       172.17.0.2   127.0.0.1

查看Kubetnetes里的service[简写svc]，可以看到指定了外网IP地址：10.200.3.81

[[email protected] ~]# kubectl get svc 
NAME         CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE 
kubernetes   10.254.0.1      <none>        443/TCP    1h 
my-nginx     10.254.81.204   10.200.3.81   8888/TCP   41m

查看nginx服务的状态：

[[email protected] ~]# curl -I 10.200.3.81:8888 
HTTP/1.1 200 OK 
Server: nginx/1.13.12 
Date: Thu, 10 May 2018 08:42:28 GMT 
Content-Type: text/html 
Content-Length: 612 
Last-Modified: Mon, 09 Apr 2018 16:01:09 GMT 
Connection: keep-alive 
ETag: "5acb8e45-264" 
Accept-Ranges: bytes

这样单节点的Kubernetes就已经跑起来了，接下来就是安装kubernetes-dashboard ，下载kubernetes-dashboard.yaml文件，修改一下即可；因为我使用的是公网的docker镜像，所以先下载dashborad的镜像到本地仓库.

[[email protected] ~]#docker pull docker.io/siriuszg/kubernetes-dashboard-amd64:v1.5.1

kubernetes-dashboard.yaml文件如下：

[[email protected] ~]# cat kubernetes-dashboard.yaml  
kind: Deployment  
apiVersion: extensions/v1beta1  
metadata:  
  labels:  
    app: kubernetes-dashboard  
  name: kubernetes-dashboard  
  namespace: kube-system  
spec:  
  replicas: 1  
  selector:  
    matchLabels:  
      app: kubernetes-dashboard  
  template:  
    metadata:  
      labels:  
        app: kubernetes-dashboard  
      # Comment the following annotation if Dashboard must not be deployed on master  
      annotations:  
        scheduler.alpha.kubernetes.io/tolerations: |  
          [  
            {  
              "key": "dedicated",  
              "operator": "Equal",  
              "value": "master",  
              "effect": "NoSchedule"  
            }  
          ]  
    spec:  
      containers:  
      - name: kubernetes-dashboard  
        image: docker.io/siriuszg/kubernetes-dashboard-amd64:v1.5.1  
        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://10.200.3.81:8080  
        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

创建实例：

# kubectl create -f kubernetes-dashboard.yaml

查看是否成功运行：

[[email protected] ~]# kubectl get pods --all-namespaces   
NAMESPACE     NAME                                    READY     STATUS    RESTARTS   AGE 
default       my-nginx-379829228-mpm5f                1/1       Running   0          59m 
kube-system   kubernetes-dashboard-3162153223-2s0qb   1/1       Running   0          40m

启动成功就可以打开网页看到效果啦：（输入http://10.200.3.81:8080/ui 即可跳转到如下地址）

号外：

kubectl get pods 状态一直为ContainerCreating解决:

跟踪状态：

可以使用kubectl describe pods Pod_Name来查看是什么原因

如果报错如下，

需要安装rhsm

#yum install *rhsm* -y

再重启服务即可

参考文档：https://www.58jb.com/html/152.html

https://www.cnblogs.com/stromliu/p/8567741.html

原创文章，作者：奋斗，如若转载，请注明出处：https://blog.ytso.com/tech/architecture/6902.html

Centos7 单节点上安装kubernetes-dashboard过程详解架构师

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