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Spring Boot - Creating Docker Image
Docker is a container management service that eases building and deployment. If you are a beginner to Docker, you can learn about is in detail at this link − https://www.tutorialspoint.com/docker/index.htm
In this chapter, we are going to see How to create a Docker image by using Maven and Gradle dependencies for your Spring Boot application.
Create Dockerfile
First, create a file with the name Dockerfile under the directories src/main/docker with the contents shown below. Note that this file is important to create a Docker image.
FROM java:8 VOLUME /tmp ADD dockerapp-0.0.1-SNAPSHOT.jar app.jar RUN bash -c 'touch /app.jar' ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
Maven
For Maven, add the Docker Maven plugin into your build configuration file pom.xml
<properties> <docker.image.prefix>spring-boot-tutorialspoint</docker.image.prefix> </properties> <build> <plugins> <plugin> <groupId>com.spotify</groupId> <artifactId>docker-maven-plugin</artifactId> <version>1.0.0</version> <configuration> <imageName>${docker.image.prefix}/${project.artifactId}</imageName> <dockerDirectory>src/main/docker</dockerDirectory> <resources> <resource> <directory>${project.build.directory}</directory> <include>${project.build.finalName}.jar</include> </resource> </resources> </configuration> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
The complete pom.xml file is given below −
<?xml version = "1.0" encoding = "UTF-8"?> <project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.tutorialspoint</groupId> <artifactId>dockerapp</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>dockerapp</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <docker.image.prefix>spring-boot-tutorialspoint</docker.image.prefix> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>com.spotify</groupId> <artifactId>docker-maven-plugin</artifactId> <version>1.0.0</version> <configuration> <imageName>${docker.image.prefix}/${project.artifactId}</imageName> <dockerDirectory>src/main/docker</dockerDirectory> <resources> <resource> <directory>${project.build.directory}</directory> <include>${project.build.finalName}.jar</include> </resource> </resources> </configuration> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
Now, you can run your application by using the Maven command mvn package docker:build
![MVN Package Docker Build](/spring_boot/images/mvn_package_docker_build.jpg)
Note − Enable the Expose daemon on tcp://localhost:2375 without TLS.
After build success, you can see the output on the console as shown below −
![MVN Package Docker Output](/spring_boot/images/mvn_package_docker_output.jpg)
Now, see the Docker images by the command using docker images and see the image info on the console.
![Docker Images Command](/spring_boot/images/docker_images_command.jpg)
Gradle
To build a Docker image by using Gradle build configuration, we need to add the docker plugin and need to write a task buildDocker to create a Docker image.
The code for Gradle Docker configuration is given below.
buildscript { ..... dependencies { ..... classpath('se.transmode.gradle:gradle-docker:1.2') } } group = 'spring-boot-tutorialspoint' ..... apply plugin: 'docker' task buildDocker(type: Docker, dependsOn: build) { applicationName = jar.baseName dockerfile = file('src/main/docker/Dockerfile') doFirst { copy { from jar into stageDir } } }
The complete build.gradle file is given below.
buildscript { ext { springBootVersion = '1.5.9.RELEASE' } repositories { mavenCentral() } dependencies { classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}") classpath('se.transmode.gradle:gradle-docker:1.2') } } group = 'spring-boot-tutorialspoint' apply plugin: 'java' apply plugin: 'eclipse' apply plugin: 'org.springframework.boot' apply plugin: 'docker' group = 'com.tutorialspoint' version = '0.0.1-SNAPSHOT' sourceCompatibility = 1.8 repositories { mavenCentral() } dependencies { compile('org.springframework.boot:spring-boot-starter-web') testCompile('org.springframework.boot:spring-boot-starter-test') } task buildDocker(type: Docker, dependsOn: build) { applicationName = jar.baseName dockerfile = file('src/main/docker/Dockerfile') doFirst { copy { from jar into stageDir } } }
Now, create a Docker image by using the command shown below −
gradle build buildDocker
![Gradle Build Docker](/spring_boot/images/gradle_build_docker.jpg)
After executing the command, you can see the BUILD SUCCESSFUL log on the console window.
![Docker Build Successful](/spring_boot/images/docker_build_successful.jpg)
Now, see the Docker images by the command using docker images and see the image’s info on the console.
![Get Image Info Using DockerImages](/spring_boot/images/get_image_info_using_dockerimages.jpg)