Layered Spring Boot Docker images #292

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1. uniquejava commented on Apr 3, 2020

   

   uniquejava

   on Apr 3, 2020

   Last edited by uniquejava

   OwnerAuthor

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   A better Dockerfile

   每一步的含义见： https://spring.io/blog/2018/11/08/spring-boot-in-a-container

   Dockerfile

   FROM adoptopenjdk/openjdk8:ubi-jre
   
   EXPOSE 9090
   
   RUN mkdir /app
   
   ARG DEPENDENCY=target/dependency
   COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
   COPY ${DEPENDENCY}/META-INF /app/META-INF
   COPY ${DEPENDENCY}/BOOT-INF/classes /app
   
   ENTRYPOINT [ "sh", "-c", "java ${JAVA_OPTS} -cp app:app/lib/* com.xxx.MyAwesomeApplication ${0} ${@}" ]
   

   像这样打包：

   mvn clean package -DskipTests=true
   mkdir target/dependency
   (cd target/dependency; tar -zxf ../*.jar)
   docker build -t myorg/myapp:$VERSION .

   新的yaml (通过yaml向docker传递JAVA_OPTS)

   参考： Define Environment Variables for a Container

       spec:
         restartPolicy: Always
         containers:
           - image: jp.icr.io/myorg/myapp:1.0.16
             imagePullPolicy: Always
             env:
               - name: JAVA_OPTS
                 value: "-Dspring.profiles.active=dev"
             name: myapp

   完整的过程

   # Log your local Docker daemon into the IBM Cloud Container Registry.
   ibmcloud cr login
   
   # 查看当前有哪些image (找到最新image的版本号)
   ibmcloud cr images
   
   # 做一个更新的image (注意每次将版本号x加1)
   export VERSION=1.0.1
   # 在本地编译java项目, dual layered, 详见 https://spring.io/blog/2018/11/08/spring-boot-in-a-container
   cd myapp
   mvn clean package -DskipTests=true
   mkdir target/dependency
   (cd target/dependency; jar -xf ../*.jar)
   docker build -t myorg/myapp:$VERSION .
   
   # 打tag
   docker tag myorg/myapp:$VERSION jp.icr.io/myorg/myapp:$VERSION
   
   # 切换到 context A
   ibmcloud ks cluster config --cluster xxxx
   # 推送到 A 集群
   docker push jp.icr.io/myorg/myapp:$VERSION
   # 修改 k8s-myapp-dev.yaml中的版本号
   vi ../kubernetes/development/k8s-myapp-dev.yaml
   # 重新apply
   kubectl apply -f ../kubernetes/development/k8s-myapp-dev.yaml
   # 查看pod状态
   kubectl get po
   # 查看spring boot启动的日志文件 (网络原因有点卡), 两个pod实例的日志交织在一起
   # 10.47.84.37 是node的内部ip地址
   ../kubernetes/development/nsenter-node.sh 10.47.84.37
   => If you dont see a command prompt, try pressing enter.
   => root@kube-xxx:~#
   => root@kube-xxx:~# tail -f /mnt/myapp/logs/sa.log (查看后台日志文件)
   => root@kube-xxx:~# exit
   （按Ctrl + D)
   => logout
   => pod "cyper-nsenter-10.47.84.37" deleted
   
   # tips: 查看当前 k8s 上下文
   kubectl config get-contexts
2. uniquejava commented on Apr 3, 2020

   

   uniquejava

   on Apr 3, 2020

   OwnerAuthor

   More actions

   继续优化

   将

   mkdir target/dependency
   (cd target/dependency; tar -zxf ../*.jar)

   写到pom.xml里

   详见： https://blog.jdriven.com/2019/08/layered-spring-boot-docker-images/
3. uniquejava

   added

   docker

   on Apr 3, 2020