Kubernetes学习笔记-项目简单部署

继续之前的移除Nacos迁移至K8s,现在把项目服务简单的部署到Kubernetes上面。

• 项目服务配置

  • Kubernetes的ConfigMap有以下几种创建方式：
    • kubectl create configmap special-config --from-literal=special.k1=v1 --from-literal=special.k2=v2
    • kubectl create configmap special-config --from-file=special-config.properties
    • kubectl apply -f special-config.yaml
  • 这里使用第三种方式创建ConfigMap。
    • 根据项目服务的需要新建common-config.yaml、service-config.yaml两个ConfigMap文件，文件内容见下方。
    • kubectl apply -f common-config.yaml
    • kubectl apply -f service-config.yaml

  apiVersion: v1
  kind: ConfigMap
  metadata:
    name: common-config
    namespace: default
  data:
    common-config.yml: |
      spring:
        main:
          allow-bean-definition-overriding: true
        mvc:
          throw-exception-if-no-handler-found: true
        messages:
          basename: i18n/messages
        datasource:
          driver-class-name: com.mysql.cj.jdbc.Driver
          type: com.zaxxer.hikari.HikariDataSource
          hikari:
            connection-timeout: 10000
            validation-timeout: 10000
            idle-timeout: 30000
            max-lifetime: 60000
            maximum-pool-size: 20
            minimum-idle: 10
            read-only: false
            connection-test-query: SELECT 1 FROM DUAL
  
      server:
        undertow:
          threads:
            io: 4
            worker: 32
          buffer-size: 1024
          direct-buffers: true
          max-http-post-size: 10485760
          max-http-header-size: 16384
        compression:
          enabled: true
          mime-types:
            - application/json
            - application/xml
            - application/javascript
            - text/html
            - text/xml
            - text/plain
            - text/javascript
            - text/css
          min-response-size: 1024
  
      management:
        endpoints:
          enabled-by-default: true
          web:
            exposure:
              include: health
          shutdown:
            enabled: true
  
      mybatis-plus:
        mapper-locations: classpath*:mapper/**/*.xml
        configuration:
          log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  

  apiVersion: v1
  kind: ConfigMap
  metadata:
    name: service-config
    namespace: default
  data:
    service-config.yml: |
      spring:
        profiles:
          active: dev
        application:
          name: demo-service
        datasource:
          url: jdbc:mysql://192.168.0.1:3306/demo-service?useSSL=false&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT%2B8
          username: root
          password: 123456
  
      server:
        port: 18080
        servlet:
          context-path: /demo-service
  

• 项目服务打包镜像

  • 项目打包：mvn clean -X -U package -DskipTests
  • 创建Dockerfile文件，简单内容见下方
  • 构建镜像：docker build -t swr.cn-east-3.myhuaweicloud.com/develop/demo-service:latest .
  • 上传镜像：docker push swr.cn-east-3.myhuaweicloud.com/develop/demo-service:latest

  FROM swr.cn-east-3.huaweicloud.com/develop/java:jdk1.8_jmx
  
  EXPOSE 18080
  EXPOSE 18081
  
  ENV DEF_JAVA_OPTS="-Djava.security.egd=file:/dev/./urandom -Duser.timezone=Asia/Shanghai -Dfile.encoding=utf-8 -Dhttps.protocols=TLSv1.2"
  ENV APP_JAR_PATH=app.jar
  
  ADD target/*.jar /app.jar
  
  ENTRYPOINT ["sh", "-c", "java ${DEF_JAVA_OPTS} -jar /app.jar"]
  

• 项目服务部署

  • 创建管理应用Pod。
    • 新建Deployment.yaml文件，简单内容见下方。
    • 执行命令：kubectl apply -f Deployment.yaml
    • 查看Pod状态：kubectl get pods
    • 查看Pod日志：kubectl logs

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: demo-service
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: demo-service
      template:
        metadata:
          labels:
            app: demo-service
        spec:
          imagePullSecrets:
            - name: imagesecret
          containers:
            - name: demo-service
              image: swr.cn-east-3.myhuaweicloud.com/develop/demo-service:latest
              imagePullPolicy: Always
              ports:
                - containerPort: 18080
    

  • 可以为动态变化的Pod提供稳定的访问入口，实现服务发现和负载均衡。
    • 新建Service.yaml文件，简单内容见下方。
    • 执行命令：kubectl apply -f Service.yaml
    • 查看Service信息：kubectl get svc
    • 访问项目服务：http://192.168.0.1:32749/demo-service/doc.html

    apiVersion: v1
    kind: Service
    metadata:
      name: demo-service
    spec:
      selector:
        app: demo-service
      ports:
        - protocol: TCP
          port: 18080
          targetPort: 18080
      type: NodePort