Kubernetes 示例 - tomcat + mysql

这个示例是《Kubernetes 权威指南（第二版）》第一章中的例子，部署一个 Java 应用，访问 MySql 数据库。

需要启动2个容器，webapp 和 mysql，每个容器各需要2个配置文件（ReplicationController + Service）。

MySql 的配置文件

mysql-rc.yaml

apiVersion: v1
kind: ReplicationController # kind 指明此资源对象的类型
metadata:
  name: mysql # 元数据 - 此资源对象的名称，全局唯一
spec:
  replicas: 1 # Pod 副本期待的数量
  selector: 
    app: mysql # label 标签，选择有此 label 的 Pod
  template: # 定义创建 Pod 实例的模板 
    metadata: 
      labels:
        app: mysql # Pod 的 label，对应上面 rc 的 selector
    spec:
      containers: # 定义 Pod 中的容器
        - name: mysql # 容器名称
          image: mysql:5.6 # 使用的 docker image
          ports:
          - containerPort: 3306 # 容器暴露的端口号
          env:  # 注入到容器内的环境变量
          - name: MYSQL_ROOT_PASSWORD
            value: '123456'

mysql-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  type: NodePort
  ports: 
    - port: 3306
  selector:
    app: mysql

web app 配置文件

myweb-rc.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: myweb
spec:
  replicas: 1
  selector:
    app: myweb
  template:
    metadata:
      labels:
        app: myweb
    spec:
      containers:
        - name: myweb
          image: kubeguide/tomcat-app:v1
          ports:
          - containerPort: 8080
          env:
          - name: GET_HOSTS_FROM
            value: dns
          - name: MYSQL_SERVICE_HOST
            value: 'mysql'
          - name: MYSQL_SERVICE_PORT
            value: '3306'

myweb-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: myweb
spec:
  type: NodePort
  ports:
    - port: 8080
      nodePort: 30001
  selector:
    app: myweb

启动

kubectl apply -f mysql-rc.yaml
kubectl apply -f mysql-svc.yaml
kubectl apply -f myweb-rc.yaml
kubectl apply -f myweb-svc.yaml

查看pods ：

kubectl get pods

NAME           READY   STATUS    RESTARTS   AGE
mysql-r5vn7    1/1     Running   1          2d14h
myweb-8nm2m    1/1     Running   1          2d14h

查看service:

kubectl get svc

NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
kubernetes   ClusterIP   10.152.183.1            443/TCP          8d
mysql        NodePort    10.152.183.70           3306:30361/TCP   2d14h
myweb        NodePort    10.152.183.52           8080:30001/TCP   2d14h

访问

myweb 服务对外的端口是 30001，访问 http://:30001/demo/

 

 

 

kubenetes实现tomcat＋mysql快速部署

访问kubenetes的demo
# http://ip/30001/demo/

# vim mysql-rc.yaml
apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql
spec:
  replicas: 1
  selector:
    app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql
        image: mysql
        ports:
        - containerPort: 3306
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "password"
# vim mysql-svc.yaml
apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  ports:
    - port: 3306
  selector:
    app: mysql
# vim myweb-rc.yaml
apiVersion: v1
  nd: ReplicationController
metadata:
  name: myweb
spec:
  replicas: 1
  selector:
    app: myweb
  template:
    metadata:
      labels:
        app: myweb
    spec:
      containers:
        - name: myweb
          image: kubeguide/tomcat-app:v1
          ports:
          - containerPort: 8080
# vim myweb-svc.yaml
apiVersion: v1
kind: Service
metadata:
  name: myweb
spec:
  type: NodePort
  ports:
    - port: 8080
      nodePort: 30001
  selector:
    app: myweb