https://kubernetes.io/docs/tutorials/stateless-application/guestbook/#start-up-the-redis-master

1、部署redis-master Deployment

  • Step1 编辑redis-master-deployment.yaml
# application/guestbook/redis-master-deployment.yaml 
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: redis-master
  labels:
    app: redis
spec:
  selector:
    matchLabels:
      app: redis
      role: master
      tier: backend
  replicas: 1
  template:
    metadata:
      labels:
        app: redis
        role: master
        tier: backend
    spec:
      containers:
      - name: master
        image: redis  # or just image: redis
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 6379
  • Step2 执行命令
# 创建Deployment
kubectl create -f redis-master-deployment.yaml 

# 查看pods
kubectl get pods

2、部署redis-master Service

  • Step1 编辑redis-master-service.yaml
# application/guestbook/redis-master-service.yaml 

apiVersion: v1
kind: Service
metadata:
  name: redis-master
  labels:
    app: redis
    role: master
    tier: backend
spec:
  ports:
  - port: 6379
    targetPort: 6379
  selector:
    app: redis
    role: master
    tier: backend
  • Step2 执行命令
# 创建DService
kubectl create -f redis-master-service.yaml 

# 查看service
kubectl get services

3、部署redis-slave Deployment

  • Step1 编辑redis-slave-deployment.yaml
# application/guestbook/redis-slave-deployment.yaml 

apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: redis-slave
  labels:
    app: redis
spec:
  selector:
    matchLabels:
      app: redis
      role: slave
      tier: backend
  replicas: 2
  template:
    metadata:
      labels:
        app: redis
        role: slave
        tier: backend
    spec:
      containers:
      - name: slave
        image: gcr.io/google_samples/gb-redisslave:v3
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        env:
        - name: GET_HOSTS_FROM
          value: dns
          # Using `GET_HOSTS_FROM=dns` requires your cluster to
          # provide a dns service. As of Kubernetes 1.3, DNS is a built-in
          # service launched automatically. However, if the cluster you are using
          # does not have a built-in DNS service, you can instead
          # access an environment variable to find the master
          # service's host. To do so, comment out the 'value: dns' line above, and
          # uncomment the line below:
          # value: env
        ports:
        - containerPort: 6379
  • Step2 执行命令
kubectl create -f redis-slave-deployment.yaml
kubectl get pods

4、部署redis slave Service

  • Step1 编辑redis-slave-service.yaml
# application/guestbook/redis-slave-service.yaml 

apiVersion: v1
kind: Service
metadata:
  name: redis-slave
  labels:
    app: redis
    role: slave
    tier: backend
spec:
  ports:
  - port: 6379
  selector:
    app: redis
    role: slave
    tier: backend
  • Step2 执行命令
kubectl create -f redis-slave-service.yaml
kubectl get services

5、部署guestbook Deployment

  • Step1 编辑frontend-deployment.yaml
# application/guestbook/frontend-deployment.yaml 

apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: frontend
  labels:
    app: guestbook
spec:
  selector:
    matchLabels:
      app: guestbook
      tier: frontend
  replicas: 3
  template:
    metadata:
      labels:
        app: guestbook
        tier: frontend
    spec:
      containers:
      - name: php-redis
        image: gcr.io/google-samples/gb-frontend:v6
        # 官网上使用的是v4版，在使用中出现ImageInspectErr，镜像出现问题，升级为v6
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        env:
        - name: GET_HOSTS_FROM
          value: dns
          # Using `GET_HOSTS_FROM=dns` requires your cluster to
          # provide a dns service. As of Kubernetes 1.3, DNS is a built-in
          # service launched automatically. However, if the cluster you are using
          # does not have a built-in DNS service, you can instead
          # access an environment variable to find the master
          # service's host. To do so, comment out the 'value: dns' line above, and
          # uncomment the line below:
          # value: env
        ports:
        - containerPort: 80
  • Step2 执行命令
kubectl create -f frontend-deployment.yaml
kubectl get pods

6、部署guestbook Service

  • Step1 编辑frontend-service.yaml
# application/guestbook/frontend-service.yaml 

apiVersion: v1
kind: Service
metadata:
  name: frontend
  labels:
    app: guestbook
    tier: frontend
spec:
  # comment or delete the following line if you want to use a LoadBalancer
  type: NodePort 
  # if your cluster supports it, uncomment the following to automatically create
  # an external load-balanced IP for the frontend service.
  # type: LoadBalancer
  ports:
  - port: 80
  selector:
    app: guestbook
    tier: frontend
  • Step2 执行命令
kubectl create -f frontend-service.yaml
kubectl get services

然后使用node的IP和端口，就可以访问服务了。

7、清理

kubectl delete deployment -l app=redis
kubectl delete service -l app=redis
kubectl delete deployment -l app=guestbook
kubectl delete service -l app=guestbook

8、小结

通过部署一个留言板服务，熟悉了kubernetes的基本的使用，知道一个服务怎么通过kubernetes部署起来。服务虽然部署起来了，但是kubernetes是怎么实现的呢？它都帮我们做了什么呢？不过在搞清楚这些之前，我们下一篇文章先说说kuberneters使用的yaml配置文件。