Docker是一个开源的引擎,可以轻松的为任何应用创建一个轻量级的、可移植的、自给自足的容器。开发者在笔记本上编译测试通过的容器可以批量地在生产环境中部署,包括VMs(虚拟机)、bare metal、OpenStack 集群和其他的基础应用平台。
创建一个springboot工程springboot-docker
package com.gf; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RestController; @SpringBootApplication @RestController public class SpringbootDockerApplication { public static void main(String[] args) { SpringApplication.run(SpringbootDockerApplication.class, args); } @GetMapping("/{name}") public String hi(@PathVariable(value = "name") String name) { return "hi , " + name; } }
我们编写一个 Dockerfile 来定制镜像,在 src/main/resources/docker 下创建 Dockerfile 文件
FROM frolvlad/alpine-oraclejdk8:slim VOLUME /tmp ADD springboot-docker-0.0.1-SNAPSHOT.jar app.jar RUN sh -c 'touch /app.jar' ENV JAVA_OPTS="" ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar" ]
我们通过maven 构建docker镜像。
在maven的pom目录,加上docker镜像构建的插件
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.gf</groupId> <artifactId>springboot-docker</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot-docker</name> <description>Demo project for Spring Boot</description> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <docker.image.prefix>gf</docker.image.prefix> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <plugin> <groupId>com.spotify</groupId> <artifactId>docker-maven-plugin</artifactId> <version>1.2.0</version> <configuration> <imageName>${docker.image.prefix}/${project.artifactId}</imageName> <dockerDirectory>src/main/resources/docker</dockerDirectory> <resources> <resource> <targetPath>/</targetPath> <directory>${project.build.directory}</directory> <include>${project.build.finalName}.jar</include> </resource> </resources> </configuration> </plugin> </plugins> </build> </project>
我们运行下面的命令构建镜像:
mvn clean mvn package docker:bulid
构建成功后,我们通过下面的命令查看镜像:
docker images
启动镜像:
#c2dba352c3c1 为镜像ID docker run -p 8080:8080 -t c2dba352c3c1
之后我们就可以访问服务了。
源码下载: https://github.com/gf-huanchupk/SpringBootLearning
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