k8s入门系列之guestbook快速部署

k8s集群以及一些扩展插件已经安装完毕，本篇文章介绍一下如何在k8s集群上快速部署guestbook应用。

•实验环境为集群：master(1)+node(4),详细内容参考《k8s入门系列之集群安装篇》

•guestbook应用示例介绍：
应用包含2部分：web前端和redis(1主2从),用户通过web前端提交数据，写入到redis-master上，然后通过读取同步到redis-slave上的数据展示给用户。

提示：所有的定义文件都存放在master端，所有的操作也都是在master端操作。

实验:

1.配置启动redis-master服务
•编辑redis-master-rc.yml定义文件
[root@master guestbook]# cat redis-master-rc.yml

kind: ReplicationController

metadata:

  name: redis-master

  labels:

    name: redis-master

spec:

  replicas:

  selector:

    name: redis-master

  template:

    metadata:

      labels:

        name: redis-master

    spec:

      containers:

      - name: master

        image: docker.gaoxiaobang.com/kubernetes/redis

        ports:

        - containerPort:

•创建Pod

[root@master guestbook]# kubectl create -f redis-master-rc.yml

replicationcontroller "redis-master" created

•查看rc(ReplicationController)

[root@master guestbook]# kubectl get rc -l name=redis-master

NAME DESIRED CURRENT AGE

redis-master   29s

•查看Pod

[root@master guestbook]# kubectl get pods -o wide

NAME                     READY     STATUS    RESTARTS   AGE       NODE
redis-master-7tt3s       1/1       Running   0          15m       192.168.30.21

Kubernetes中Service中起到了负载均衡器的作用，通过Proxy和Selector决定服务请求传递给后端提供服务的Pod，对外提供固定的IP,这样的话Redis Master Pod迁移变化也不会影响。

•编辑redis-master-svc.yml定义文件
[root@master guestbook]# cat redis-master-svc.yml

apiVersion: v1

kind: Service

metadata:

  name: redis-master

  labels:

    name: redis-master

spec:

  ports:

  - port:

    targetPort:

  selector:

    name: redis-master

•创建Service

[root@master guestbook]# kubectl create -f redis-master-svc.yml

•查看Service

[root@master guestbook]# kubectl get svc redis-master

NAME           CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE

redis-master   10.254.59.45   <none>        /TCP   3m

2.配置启动redis-slave服务
•编辑redis-slave-rc.yml定义文件
[root@master guestbook]# cat redis-slave-rc.yml

apiVersion: v1

kind: ReplicationController

metadata:

  name: redis-slave

  labels:

    name: redis-slave

spec:

  replicas:

  selector:

    name: redis-slave

  template:

    metadata:

      labels:

        name: redis-slave

    spec:

      containers:

      - name: worker

        image: docker.gaoxiaobang.com/kubernetes/redis-slave

        ports:

        - containerPort:

•创建Pod

[root@master guestbook]# kubectl create -f redis-slave-rc.yml

replicationcontroller "redis-slave" created

•查看rc

[root@master guestbook]# kubectl get rc redis-slave

NAME          DESIRED   CURRENT   AGE

redis-slave                     1m

•查看Pod

[root@master guestbook]# kubectl get pod -o wide

NAME                     READY     STATUS    RESTARTS   AGE       NODE

redis-master-7tt3s       /       Running             15m       192.168.30.21

redis-slave-drxok        /       Running             15m       192.168.30.23

redis-slave-h43yo        /       Running             15m       192.168.30.21

•编辑redis-slave-svc.yml定义文件
[root@master guestbook]# cat redis-slave-svc.yml

apiVersion: v1

kind: Service

metadata:

  name: redis-slave

  labels:

    name: redis-slave

spec:

  ports:

  - port:

    targetPort:

  selector:

    name: redis-slave

•创建Service

[root@master guestbook]# kubectl create -f redis-slave-svc.yml

service "redis-slave" created

•查看Service

[root@master guestbook]# kubectl get svc redis-slave

NAME          CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE

redis-slave   10.254.172.53   <none>        /TCP   19m

3.配置启动web端服务
•编辑guestbook-web-rc.yml定义文件
[root@master guestbook]# cat guestbook-web-rc.yml

apiVersion: v1

kind: ReplicationController

metadata:

  name: guestbook-web

  labels:

    name: guestbook-web

spec:

  replicas:

  selector:

    name: guestbook-web

  template:

    metadata:

      labels:

        name: guestbook-web

    spec:

      containers:

      - name: php-redis

        image: docker.gaoxiaobang.com/kubernetes/guestbook-web

        ports:

        - containerPort:

•创建Pod

[root@master guestbook]# kubectl create -f guestbook-web-rc.yml

replicationcontroller "guestbook-web" created

•查看rc

[root@master guestbook]# kubectl get rc guestbook-web

NAME            DESIRED   CURRENT   AGE

guestbook-web                     18m

•查看Pod

[root@master guestbook]# kubectl get pods

NAME                     READY     STATUS    RESTARTS   AGE

guestbook-web-1un8o      /       Running             34m

guestbook-web-iyxpg      /       Running             34m

gxb-web-rc-afi56         /       Running             10d

redis-master-7tt3s       /       Running             38m

redis-slave-drxok        /       Running             37m

redis-slave-h43yo        /       Running             37m

•编辑guestbook-web-svc.yml定义文件
[root@master guestbook]# cat guestbook-web-svc.yml

apiVersion: v1

kind: Service

metadata:

  name: guestbook-web

  labels:

    name: guestbook-web

spec:

  type: NodePort

  ports:

  - port:

  selector:

    name: guestbook-web

•创建Service

You have exposed your service on an external port on all nodes in your

cluster. If you want to expose this service to the external internet, you may

need to set up firewall rules for the service port(s) (tcp:) to serve traffic.

See http://releases.k8s.io/release-1.2/docs/user-guide/services-firewalls.md for more details.

service "guestbook-web" created

*提示：在集群所有node节点上都开启了520端口，访问任何一个node的520端口都可以。例如：192.168.30.21:520

•查看Service

[root@master guestbook]# kubectl get svc guestbook-web

NAME            CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE

guestbook-web   10.254.225.216   nodes         /TCP    34m

4.访问guestbook，如下图

参考文章:

http://dockone.io/article/542

巴特西

k8s入门系列之guestbook快速部署

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