kubernetes 之Guestbook 留言板

备注：本例是按照kubernetes 权威指南第二版 2.3 Guestbook演示实例：Hello World ! 整理

Guestbook留言板系统部署架构图

Guestbook 留言板系统部署架构图

备注：本例中的3个Docker 镜像地址为：https://hub.docker.com/u/kubeguide

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首先先定义Service，然后定义一个RC来创建和控制关联的Pod，或者先定义RC来创建Pod，然后定义与之关联的Service

本例是先定义RC 在定义Service

安装Redis集群

[root@master yaml]# vi redis-master-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:name: redis-masterlabels: name: redis-master
spec:replicas: 1selector:name: redis-mastertemplate:metadata:labels:name: redis-masterspec:containers:- name: masterimage: kubeguide/redis-masterports:- containerPort: 6379

创建完成之后，在master节点上发布到集群中

[root@master yaml]# kubectl create -f redis-master-controller.yaml
replicationcontroller "redis-master" created

用kubectl get 命令确认RC和Pod 创建成功

[root@master yaml]# kubectl get rc
NAME           DESIRED   CURRENT   READY     AGE
redis-master   1         1         1         8s
查看Pod
[root@master yaml]# kubectl get pods
NAME                        READY     STATUS    RESTARTS   AGE
redis-master-brh9j          1/1       Running   0          4m

redis-master Pod 已创建且正常运行后，在创建与之关联的Service

[root@master yaml]# vi redis-master-service.yaml

apiVersion: v1
kind: Service
metadata:name: redis-masterlabels: name: redis-master
spec:ports:- port: 6379targetPort: 6379selector:name: redis-master

运行kubectl create 命令创建该service

[root@master yaml]# kubectl create -f redis-master-service.yaml
service "redis-master" created

运行kubectl get 命令确认Service 运行

[root@master yaml]# kubectl get svc

NAME             TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
kubernetes       ClusterIP   10.96.0.1        <none>        443/TCP          23h
mysql            ClusterIP   10.107.118.174   <none>        3306/TCP         19h
myweb            NodePort    10.100.179.98    <none>        3306:30001/TCP   16h
redis-master     ClusterIP   10.107.69.32     <none>        6379/TCP         14s
tomcat-service   NodePort    10.106.225.208   <none>        8080:31003/TCP   16h

已经成功启动了redis-master 服务，下面再创建redis-slave RC 和Service

[root@master yaml]# vi redis-slave-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:name: redis-slavelabels: name: redis-slave
spec:replicas: 2selector:name: redis-slavetemplate:metadata:labels:name: redis-slavespec:containers:- name: slaveimage: kubeguide/guestbook-redis-slaveenv: - name: GET_HOSTS_FROMvalue: envports:- containerPort: 6379

同上，在master节点发布到集群中

[root@master yaml]# kubectl create -f redis-slave-controller.yaml
replicationcontroller "redis-slave" created

运行kubectl create 确认RC 和Pod 启动

[root@master yaml]# kubectl get rc
NAME           DESIRED   CURRENT   READY     AGE
redis-master   1         1         1         15m
redis-slave    2         2         2         41s

[root@master yaml]# kubectl get pods
NAME                        READY     STATUS              RESTARTS   AGE
redis-master-brh9j          1/1       Running             0          15m
redis-slave-zcdgd           1/1       Running   0          54s
redis-slave-ztznm           1/1       Running   0          54s

创建与redis-slave 相关的Service 服务

[root@master yaml]# vi redis-slave-service.yaml

apiVersion: v1
kind: Service
metadata:name: redis-slavelabels: name: redis-slave
spec:ports:- port: 6379targetPort: 6379selector:name: redis-slave

运行kubectl create 命令发布该Service

[root@master yaml]# kubectl create -f redis-slave-service.yaml
service "redis-slave" created

运行kubectl create 确认 Service 运行

[root@master yaml]# kubectl get svc
NAME             TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
kubernetes       ClusterIP   10.96.0.1        <none>        443/TCP          1d
redis-master     ClusterIP   10.107.69.32     <none>        6379/TCP         31m
redis-slave      ClusterIP   10.111.164.104   <none>        6379/TCP         23s

安装Frentend 集群

接下来再创建frontendRC 和Service

[root@master yaml]# vi frontend-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:name: frontend
spec:replicas: 3selector:name: frontend template:metadata:labels:name: frontendspec:containers:- name: frontendimage: kubeguide/guestbook-php-frontendenv:- name: GET_HOSTS_FROMvalue: envports:- containerPort: 80

发布

[root@master yaml]# kubectl create -f frontend-controller.yaml
replicationcontroller "frontend" created

运行kubectl get 确认创建成功

[root@master yaml]# kubectl get rc
NAME           DESIRED   CURRENT   READY     AGE
frontend       3         3         3         22s
mysql          1         1         1         20h
myweb          5         5         5         17h
redis-master   1         1         1         43m
redis-slave    2         2         2         29m[root@master yaml]# kubectl get pods
NAME                        READY     STATUS              RESTARTS   AGE
frontend-f8g2l              0/1       Running             0          52s
frontend-jdhcg              0/1       Running             0          52s
frontend-r6wtr              0/1       Running             0          52s
redis-master-brh9j          1/1       Running             0          44m
redis-slave-zcdgd           1/1       Running             0          29m
redis-slave-ztznm           1/1       Running             0          29m
[root@master yaml]#

创建与frontend 相关联的Service 服务

[root@master yaml]# vi frontend-service.yaml

apiVersion: v1
kind: Service
metadata:name: frontendlabels: name: frontend
spec:type: NodePortports:- port: 80nodePort: 30003 selector:name: frontend

运行kubectl create 命令发布到集群中

[root@master yaml]# kubectl create -f frontend-service.yaml
service "frontend" created

运行kubectl get 命令确认frontend Service 运行

[root@master yaml]# kubectl get svc
NAME             TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
frontend         NodePort    10.105.54.5      <none>        80:30003/TCP     8s
kubernetes       ClusterIP   10.96.0.1        <none>        443/TCP          1d
redis-master     ClusterIP   10.107.69.32     <none>        6379/TCP         41m
redis-slave      ClusterIP   10.111.164.104   <none>        6379/TCP         10m

web 页面浏览

在web 上登录：10.10.9.11:30003 or 10.10.9.12:30003/10.10.9.12:30003都能访问如下页面