基于Kubernetes(k8s)部署Dubbo+Nacos服务

Posted 2023-03-14

一、说明

本文介绍基于 Kubernetes(k8s) 环境集成阿里云 私有镜像仓库 来部署一套 Dubbo + Nacos 的微服务系统，并使用 Kubernetes DNS 以及 port-forward 的方式来打通网络访问。

 

二、部署 mysql

创建配置文件 mysql-local.yaml 内容如下：

apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql
  labels:
    name: mysql
spec:
  replicas: 1
  selector:
    name: mysql
  template:
    metadata:
      labels:
        name: mysql
    spec:
      containers:
      - name: mysql
        image: nacos/nacos-mysql:5.7
        ports:
        - containerPort: 3306
        volumeMounts:
        - name: mysql-data
          mountPath: /var/lib/mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "root"
        - name: MYSQL_DATABASE
          value: "nacos_devtest"
        - name: MYSQL_USER
          value: "nacos"
        - name: MYSQL_PASSWORD
          value: "nacos"
      volumes:
      - name: mysql-data
        hostPath:
          path: /var/lib/mysql
---
apiVersion: v1
kind: Service
metadata:
  name: mysql
  labels:
    name: mysql
spec:
  ports:
  - port: 3306
    targetPort: 3306
  selector:
    name: mysql

执行以下命令，部署 MySQL 5.7：

kubectl apply -f mysql-local.yaml

 

三、部署 Nacos

创建配置文件 nacos-standalone-start.yaml 内容如下：

---
apiVersion: v1
kind: Service
metadata:
  name: nacos-standalone
  labels:
    app: nacos-standalone
spec:
  type: ClusterIP
  clusterIP: None
  ports:
    - port: 8848
      name: server
      targetPort: 8848
    - port: 9848
      name: client-rpc
      targetPort: 9848
    - port: 9849
      name: raft-rpc
      targetPort: 9849
    ## 兼容1.4.x版本的选举端口
    - port: 7848
      name: old-raft-rpc
      targetPort: 7848
  selector:
    app: nacos
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: nacos-cm
data:
  mysql.host: "mysql"
  mysql.db.name: "nacos_devtest"
  mysql.port: "3306"
  mysql.user: "nacos"
  mysql.password: "nacos"
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nacos
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: nacos
      annotations:
        pod.alpha.kubernetes.io/initialized: "true"
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                      - nacos
              topologyKey: "kubernetes.io/hostname"
      containers:
        - name: nacos
          imagePullPolicy: Always
          image: nacos/nacos-server:latest
          resources:
            requests:
              memory: "1Gi"
              cpu: "500m"
          ports:
            - containerPort: 8848
              name: client
            - containerPort: 9848
              name: client-rpc
            - containerPort: 9849
              name: raft-rpc
            - containerPort: 7848
              name: old-raft-rpc
          env:
            - name: SPRING_DATASOURCE_PLATFORM
              value: "mysql"
            - name: MYSQL_SERVICE_HOST
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.host
            - name: MYSQL_SERVICE_DB_NAME
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.db.name
            - name: MYSQL_SERVICE_PORT
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.port
            - name: MYSQL_SERVICE_USER
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.user
            - name: MYSQL_SERVICE_PASSWORD
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.password
            - name: MODE
              value: "standalone"
            - name: NACOS_SERVER_PORT
              value: "8848"
            - name: PREFER_HOST_MODE
              value: "hostname"
  selector:
    matchLabels:
      app: nacos

执行以下命令，部署 Nacos 最新版本：

kubectl apply -f nacos-standalone-start.yaml

执行以下命令，暴露 Nacos 的端口到宿主机中给外部访问：

nohup kubectl port-forward svc/nacos-standalone 8848:8848 9848:9848 9849:9849 7848:7848 --address=0.0.0.0 &

 

四、部署 Dubbo 服务

4.1. 创建镜像仓库的密钥

由于拉取阿里云仓库的私有镜像时需要输入账户和密码，需要用到 k8s 的 Secret 对象来管理密码秘钥等敏感信息。

执行以下命令，创建 Secret 对象：

kubectl create secret docker-registry aliyuncs \\
  --docker-server=registry.cn-guangzhou.aliyuncs.com \\
  --docker-username=[e-mail] \\
  --docker-password=xxxxxx

创建成功后，可以使用以下命令查看密钥信息：

kubectl get secret aliyuncs --output=yaml

 

4.2. 部署 provider 服务

创建配置文件 provider.yaml 内容如下：

---
apiVersion: v1
kind: Service
metadata:
  name: zlt-nacos-provider
spec:
  clusterIP: None
  selector:
    app: zlt-nacos-provider
  ports:
    - protocol: TCP
      port: 20880
      targetPort: 20880
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: zlt-nacos-provider
spec:
  replicas: 1
  selector:
    matchLabels:
      app: zlt-nacos-provider
  template:
    metadata:
      labels:
        app: zlt-nacos-provider
    spec:
      imagePullSecrets:
        - name: aliyuncs
      containers:
        - name: server
          image: registry.cn-guangzhou.aliyuncs.com/zlt-test/nacos-provider:1.0-SNAPSHOT
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 20880
          env:
            - name: DUBBO_REGISTRY_ADDRESS
              value: "nacos://nacos-standalone:8848"
            - name: DUBBO_IP_TO_REGISTRY
              value: "zlt-nacos-provider"

执行以下命令，部署 provider 最新版本：

kubectl apply -f provider.yaml

 

4.3. 部署 consumer 服务

创建配置文件 consumer.yaml 内容如下：

---
apiVersion: v1
kind: Service
metadata:
  name: zlt-nacos-consumer
spec:
  clusterIP: None
  selector:
    app: zlt-nacos-consumer
  ports:
    - name: web
      port: 8080
      targetPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: zlt-nacos-consumer
spec:
  replicas: 1
  selector:
    matchLabels:
      app: zlt-nacos-consumer
  template:
    metadata:
      labels:
        app: zlt-nacos-consumer
    spec:
      imagePullSecrets:
        - name: aliyuncs
      containers:
        - name: server
          image: registry.cn-guangzhou.aliyuncs.com/zlt-test/nacos-consumer:1.0-SNAPSHOT
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 8080
          env:
            - name: DUBBO_REGISTRY_ADDRESS
              value: "nacos://nacos-standalone:8848"
            - name: DUBBO_IP_TO_REGISTRY
              value: "zlt-nacos-consumer"

执行以下命令，部署 consumer 最新版本：

kubectl apply -f consumer.yaml

 

五、测试

通过命令 kubectl get pod 查看所有创建的 pods 确保所有的状态都为 Running

执行以下命令，暴露 consumer 服务的 web 端口到宿主机中给外部访问：

nohup kubectl port-forward svc/zlt-nacos-consumer 8080:8080 --address=0.0.0.0 &

在浏览器输入以下地址进行访问：

http://宿主机IP:8080/test?name=123

 

六、样例工程

集成 jib-maven-plugin 插件的样例 Spring Boot 工程：

• https://gitee.com/zlt2000_admin/zlt-dubbo-samples/tree/master/dubbo-nacos
• https://github.com/zlt2000/zlt-dubbo-samples/tree/master/dubbo-nacos