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

[[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

6902.html