Docker是一种容器管理服务,可以简化构建和部署.如果您是Docker的初学者,您可以通过此链接了解详细信息. https://www.it1352.comhttps://www.tutorialspoint.com/docker/index.htm
在本章中,我们将看到如何使用Maven和Gradle依赖项为Spring Boot应用程序创建Docker镜像.
首先,在目录 src/main/docker 下创建一个名为 Dockerfile 的文件,其内容如下所示.请注意,此文件对于创建Docker镜像非常重要.
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"]
对于Maven,添加Docker Maven插件到你的构建配置文件中 pom.xml
<properties> <docker.image.prefix>spring-boot-it1352</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>
完整的pom.xml文件在下面和下面给出;
<?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.it1352</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-it1352</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>
现在,您可以使用Maven命令运行您的应用程序 mvn package docker:build
注意 : 在没有TLS的情况下在 tcp://localhost:2375 上启用Expose守护程序.
在构建成功后,您可以在控制台上看到输出,如下所示 :
现在,请参阅Docker图像命令使用docker镜像并在控制台上查看图像信息.
要使用Gradle构建配置构建Docker镜像,我们需要添加 docker 插件并需要编写任务 buildDocker 创建一个Docker镜像.
下面给出了Gradle Docker配置的代码.
buildscript { ..... dependencies { ..... classpath('se.transmode.gradle:gradle-docker:1.2') } } group = 'spring-boot-it1352' ..... apply plugin: 'docker' task buildDocker(type: Docker, dependsOn: build) { applicationName = jar.baseName dockerfile = file('src/main/docker/Dockerfile') doFirst { copy { from jar into stageDir } } }
完整的build.gradle文件如下所示.
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-it1352' apply plugin: 'java' apply plugin: 'eclipse' apply plugin: 'org.springframework.boot' apply plugin: 'docker' group = 'com.it1352' 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 } } }
现在,使用下面显示的命令创建一个Docker镜像 :
gradle build buildDocker
执行命令后,您可以在控制台窗口中看到BUILD SUCCESSFUL日志.
现在,请查看Docker图像.命令使用 docker images 并在控制台上查看图像信息.