k8s之Hello World(四)
阿新 • • 發佈:2018-11-16
例項:Guestbook留言板系統將通過Pod、RC、Service等資源物件搭建完成,成功啟動後在網頁中顯示一條“Hello World”留言。其系統架構是一個基於PHP+Redis的分散式Web應用,前端PHP Web網站通過訪問後端的Redis來完成使用者留言的查詢和新增功能。同時Redis以Master+Slave的模式進行部署,實現資料的讀寫分離能力。
架構圖:
一、建立redis-master的RC定義檔案 vim redis-master-controller.yaml
apiVersion: v1 kind: ReplicationController #表明這是一個RC metadata: name: redis-master labels: name: redis-master spec: replicas: 1 selector: #spec.selector是RC的Pod選擇器,監控和管理擁有這些標籤(Label)的Pod例項,確保當前叢集上始終有且僅有replicas個Pod例項在執行,這裡設定replicas=1表示只執行一個名為redis-master的Pod例項,當叢集中執行的Pod數量小於replicas時,RC會根據spec.template段定義的Pod模組來生成一個新的Pod例項,lebels屬性指定了該Pod的標籤,這裡的labels必須匹配RC的spec.selector name: redis-master template: metadata: labels: name: redis-master spec: containers: - name: master image: kubeguide/redis-master ports: - containerPort: 6379
kubectl create -f redis-master-controller.yaml
apiVersion: v1 kind: Service metadata: name: redis-master #metadata.name是Service的服務名 labels: name: redis-master spec: ports: - port: 6379 #port屬性定義的是Service的虛擬埠號 targetPort: 6379 #targetPort屬性指定後端Pod內容器應用監聽的埠號 selector: #spec.selector確定了選擇哪些Pod name: redis-master
kubectl create -f redis-master-service.yaml
3、建立redis-slave RC定義檔案 vim redis-slave-controller.yaml
apiVersion: v1 kind: ReplicationController metadata: name: redis-slave labels: name: redis-slave spec: replicas: 2 selector: name: redis-slave template: metadata: labels: name: redis-slave spec: containers: - name: slave image: kubeguide/guestbook-redis-slave env: - name: GET_HOSTS_FROM value: env ports: - containerPort: 6379
4、建立redis-slave Service檔案 vim redis-slave-service.yaml
apiVersion: v1 kind: Service metadata: name: redis-slave labels: name: redis-slave spec: ports: - port: 6379 selector: name: redis-slave
5、建立frontend RC vim frontend-controller.yaml
apiVersion: v1 kind: ReplicationController metadata: name: frontend labels: name: frontend spec: replicas: 3 selector: name: frontend template: metadata: labels: name: frontend spec: containers: - name: frontend image: kubeguide/guestbook-php-frontend env: - name: GET_HOSTS_FROM value: env ports: - containerPort: 80
6、建立frontend Service vim frontend-service.yaml
apiVersion: v1 kind: Service metadata: name: frontend labels: name: frontend spec: type: NodePort ports: - port: 80 nodePort: 30001 selector: name: frontend
7、通過瀏覽器訪問frontend頁面