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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-confignamespace: default
  data:common-config.yml: |spring:main:allow-bean-definition-overriding: truemvc:throw-exception-if-no-handler-found: truemessages:basename: i18n/messagesdatasource:driver-class-name: com.mysql.cj.jdbc.Drivertype: com.zaxxer.hikari.HikariDataSourcehikari:connection-timeout: 10000validation-timeout: 10000idle-timeout: 30000max-lifetime: 60000maximum-pool-size: 20minimum-idle: 10read-only: falseconnection-test-query: SELECT 1 FROM DUALserver:undertow:threads:io: 4worker: 32buffer-size: 1024direct-buffers: truemax-http-post-size: 10485760max-http-header-size: 16384compression:enabled: truemime-types:- application/json- application/xml- application/javascript- text/html- text/xml- text/plain- text/javascript- text/cssmin-response-size: 1024management:endpoints:enabled-by-default: trueweb:exposure:include: healthshutdown:enabled: truemybatis-plus:mapper-locations: classpath*:mapper/**/*.xmlconfiguration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  

  apiVersion: v1
  kind: ConfigMap
  metadata:name: service-confignamespace: default
  data:service-config.yml: |spring:profiles:active: devapplication:name: demo-servicedatasource:url: jdbc:mysql://192.168.0.1:3306/demo-service?useSSL=false&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT%2B8username: rootpassword: 123456server:port: 18080servlet: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_jmxEXPOSE 18080
  EXPOSE 18081ENV 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.jarADD target/*.jar /app.jarENTRYPOINT ["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: 1selector:matchLabels:app: demo-servicetemplate:metadata:labels:app: demo-servicespec:imagePullSecrets:- name: imagesecretcontainers:- name: demo-serviceimage: swr.cn-east-3.myhuaweicloud.com/develop/demo-service:latestimagePullPolicy: Alwaysports:- 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-serviceports:- protocol: TCPport: 18080targetPort: 18080type: NodePort