此项目的代码已经放到GitHub中，地址/twingao/springboot-docker。先展示SpringBoot项目的目录结构。
tree springboot-docker/springboot-docker/├── pom.xml└── src└── main├── docker│ └── Dockerfile├── java│ └── com│ └── twingao│ ├── controller│ │ └── DemoController.java│ └── SpringbootDockerApplication.java└── resources└── application.yml8 directories, 5 files
pom.xml中引入docker-maven-plugin插件。
cat pom.xml<?xml version="1.0" encoding="UTF-8"?><project xmlns="/POM/4.0.0" xmlns:xsi="/2001/XMLSchema-instance"xsi:schemaLocation="/POM/4.0.0 /xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.4.RELEASE</version><relativePath/></parent><groupId>com.twingao</groupId><artifactId>springboot-docker</artifactId><version>1.0.0</version><name>springboot-docker</name><description>springboot docker demo</description><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin><plugin><groupId>com.spotify</groupId><artifactId>docker-maven-plugin</artifactId><version>0.4.13</version><configuration><imageName>twingao/${project.name}:${project.version}</imageName><dockerDirectory>src/main/docker</dockerDirectory><resources><resource><targetPath>/</targetPath><directory>${project.build.directory}</directory><include>${project.build.finalName}.jar</include></resource></resources></configuration></plugin></plugins></build></project>
在src/main下创建docker目录，Dockerfile就放在该目录下。
cat src/main/docker/DockerfileFROM openjdk:8-jdk-alpineVOLUME /opt/tmpADD springboot-docker-1.0.0.jar springboot-docker.jarENV JAVA_OPTS=""ENTRYPOINT exec java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /springboot-docker.jar
编译并构建Docker镜像。
mvn clean package docker:build[INFO] Scanning for projects...[INFO][INFO] -------------------< com.twingao:springboot-docker >--------------------[INFO] Building springboot-docker 1.0.0[INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:3.1.0:clean (default-clean) @ springboot-docker ---[INFO] Deleting /root/code/springboot-docker/target[INFO][INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ springboot-docker ---[INFO] Using 'UTF-8' encoding to copy filtered resources.[INFO] Copying 1 resource[INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ springboot-docker ---[INFO] Changes detected - recompiling the module![INFO] Compiling 2 source files to /root/code/springboot-docker/target/classes[INFO][INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) @ springboot-docker ---[INFO] Using 'UTF-8' encoding to copy filtered resources.[INFO] skip non existing resourceDirectory /root/code/springboot-docker/src/test/resources[INFO][INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ springboot-docker ---[INFO] No sources to compile[INFO][INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ springboot-docker ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:3.1.2:jar (default-jar) @ springboot-docker ---[INFO] Building jar: /root/code/springboot-docker/target/springboot-docker-1.0.0.jar[INFO][INFO] --- spring-boot-maven-plugin:2.2.4.RELEASE:repackage (repackage) @ springboot-docker ---[INFO] Replacing main artifact with repackaged archive[INFO][INFO] --- docker-maven-plugin:0.4.13:build (default-cli) @ springboot-docker ---[INFO] Copying /root/code/springboot-docker/target/springboot-docker-1.0.0.jar -> /root/code/springboot-docker/target/docker/springboot-docker-1.0.0.jar[INFO] Copying src/main/docker/Dockerfile -> /root/code/springboot-docker/target/docker/Dockerfile[INFO] Building image twingao/springboot-docker:1.0.0Step 1/5 : FROM openjdk:8-jdk-alpine---> a3562aa0b991Step 2/5 : VOLUME /opt/tmp---> Using cache---> ce2415a919e7Step 3/5 : ADD springboot-docker-1.0.0.jar springboot-docker.jar---> 2717f349a049Step 4/5 : ENV JAVA_OPTS=""---> Running in e7292f45d4ebRemoving intermediate container e7292f45d4eb---> 5afb54716215Step 5/5 : ENTRYPOINT exec java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /springboot-docker.jar---> Running in e5751ecddf88Removing intermediate container e5751ecddf88---> 8b3409a5562eProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}Successfully built 8b3409a5562eSuccessfully tagged twingao/springboot-docker:1.0.0[INFO] Built twingao/springboot-docker:1.0.0[INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 36.895 s[INFO] Finished at: -02-08T15:36:10+08:00[INFO] ------------------------------------------------------------------------
查看生成的镜像。
docker imagesREPOSITORY TAG IMAGE ID CREATED SIZEtwingao/springboot-docker 1.0.08b3409a5562e 48 seconds ago122MBopenjdk 8-jdk-alpine a3562aa0b991 9 months ago 105MB
运行容器，验证一下。
docker run -d --name springboot-docker -p 8080:8080 twingao/springboot-docker:1.0.0b6fe11c8726a44b24c90691b48cd6f63c9548eab98161261d38d25102bd387f8docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTSNAMES98cfc8bdbc2d twingao/springboot-docker:1.0.0 "/bin/sh -c 'exec ja…" 20 seconds agoUp 18 seconds 0.0.0.0:8080->8080/tcp springboot-dockercurl http://localhost:8080/demoHello World
打开浏览器，访问http://192.168.1.35:8080/demo，也可以访问。
可以进一步将构建的Docker镜像push到上。当然首先应该有一个docker hub账号。
先修改maven的配置文件,增加docker hub服务配置。
cat /usr/local/maven-3.6.2/conf/settings.xml...<server><id>docker-hub</id><username>docker-hub账号</username><password>docker-hub密码</password><configuration><email>docker-hub邮件地址</email></configuration></server></servers>...
docker-maven-plugin插件增加docker hub配置。
cat pom.xml...<plugin><groupId>com.spotify</groupId><artifactId>docker-maven-plugin</artifactId><version>0.4.13</version><configuration><imageName>twingao/${project.name}:${project.version}</imageName><dockerDirectory>src/main/docker</dockerDirectory><resources><resource><targetPath>/</targetPath><directory>${project.build.directory}</directory><include>${project.build.finalName}.jar</include></resource></resources><serverId>docker-hub</serverId><registryUrl>https://index.docker.io/v1/</registryUrl></configuration></plugin>...
编译、构建Docker镜像并push到docker hub中。
mvn clean package docker:build -DpushImage[INFO] Scanning for projects...[INFO][INFO] -------------------< com.twingao:springboot-docker >--------------------[INFO] Building springboot-docker 1.0.0[INFO] --------------------------------[ jar ]---------------------------------[INFO][INFO] --- maven-clean-plugin:3.1.0:clean (default-clean) @ springboot-docker ---[INFO] Deleting /root/code/springboot-docker/target[INFO][INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ springboot-docker ---[INFO] Using 'UTF-8' encoding to copy filtered resources.[INFO] Copying 1 resource[INFO] Copying 0 resource[INFO][INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ springboot-docker ---[INFO] Changes detected - recompiling the module![INFO] Compiling 2 source files to /root/code/springboot-docker/target/classes[INFO][INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) @ springboot-docker ---[INFO] Using 'UTF-8' encoding to copy filtered resources.[INFO] skip non existing resourceDirectory /root/code/springboot-docker/src/test/resources[INFO][INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ springboot-docker ---[INFO] No sources to compile[INFO][INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ springboot-docker ---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:3.1.2:jar (default-jar) @ springboot-docker ---[INFO] Building jar: /root/code/springboot-docker/target/springboot-docker-1.0.0.jar[INFO][INFO] --- spring-boot-maven-plugin:2.2.4.RELEASE:repackage (repackage) @ springboot-docker ---[INFO] Replacing main artifact with repackaged archive[INFO][INFO] --- docker-maven-plugin:0.4.13:build (default-cli) @ springboot-docker ---[INFO] Copying /root/code/springboot-docker/target/springboot-docker-1.0.0.jar -> /root/code/springboot-docker/target/docker/springboot-docker-1.0.0.jar[INFO] Copying src/main/docker/Dockerfile -> /root/code/springboot-docker/target/docker/Dockerfile[INFO] Building image twingao/springboot-docker:1.0.0Step 1/5 : FROM openjdk:8-jdk-alpine---> a3562aa0b991Step 2/5 : VOLUME /opt/tmp---> Using cache---> ce2415a919e7Step 3/5 : ADD springboot-docker-1.0.0.jar springboot-docker.jar---> 2535eff7e177Step 4/5 : ENV JAVA_OPTS=""---> Running in 7c7041df4f51Removing intermediate container 7c7041df4f51---> d87e0602b118Step 5/5 : ENTRYPOINT exec java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /springboot-docker.jar---> Running in 1ea77b69a6cdRemoving intermediate container 1ea77b69a6cd---> 9ccd40c50a80ProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}Successfully built 9ccd40c50a80Successfully tagged twingao/springboot-docker:1.0.0[INFO] Built twingao/springboot-docker:1.0.0[INFO] Pushing twingao/springboot-docker:1.0.0The push refers to repository [docker.io/twingao/springboot-docker]fa517bd9ccf3: Pushedceaf9e1ebef5: Layer already exists9b9b7f3d56a0: Layer already existsf1b5933fe4b5: Layer already exists1.0.0: digest: sha256:147e1d4475fc74a083bcf50e2a96abd13e8f796fc56b1d5445291fecd7ed8880 size: 1159null: null[INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 52.408 s[INFO] Finished at: -02-08T21:07:21+08:00[INFO] ------------------------------------------------------------------------
