SpringBoot打包成Docker镜像的几种实现方式
作者：242030
Spring Boot是一个用于构建独立的、可执行的Spring应用程序的框架,结合使用Spring Boot和Docker,可以方便地将应用程序部署到不同的环境中本文,主要介绍了SpringBoot打包成Docker镜像的几种实现方式,感兴趣的可以了解一下
1、第一种方式
1.1 编写一个springboot项目并且打包成jar包
package com.example.demo.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@RequestMapping("/hello")
public String hello(){
return "Hello World!!!";
}
}
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
1.2 安装docker插件
Docker
1.3 项目打包
mvn package
1.4 在target目录下编写Dockerfile文件
FROM openjdk:8 COPY *.jar /app.jar CMD ["--server.port=8080"] EXPOSE 8080 ENTRYPOINT ["java","-jar","/app.jar"]
1.5 构建镜像
$ docker build -t demo:v1 .
[root@zsx target]# docker build -t demo:v1 . Sending build context to Docker daemon 17.37MB Step 1/5 : FROM openjdk:8 ---> b273004037cc Step 2/5 : COPY *.jar /app.jar ---> 71538f2a4725 Step 3/5 : CMD ["--server.port=8080"] ---> Running in 9a08516ce3b2 Removing intermediate container 9a08516ce3b2 ---> 58ad7de95482 Step 4/5 : EXPOSE 8080 ---> Running in 47ae06299ac5 Removing intermediate container 47ae06299ac5 ---> 50c705487e20 Step 5/5 : ENTRYPOINT ["java","-jar","/app.jar"] ---> Running in 2252f518b4cb Removing intermediate container 2252f518b4cb ---> 3da5156a3350 Successfully built 3da5156a3350 Successfully tagged demo:v1
$ docker images
1.5 运行
$ docker run -d -P --name spring-boot-demo demo:v1 $ curl http://192.168.136.195:49153/hello
2、第二种方式
2.1 SpringBoot项目
<?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 https://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>2.0.0.RELEASE</version>
</parent>
<groupId>com.example</groupId>
<artifactId>spring-boot-docker</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot-docker</name>
<description>spring-boot-docker</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<docker.image.prefix>springboot</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</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>
<!-- Docker maven plugin start-->
<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>
<targetPath>/</targetPath>
<directory>${project.build.directory}</directory>
<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
<!-- Docker maven plugin start-->
</plugins>
</build>
</project>
package com.example.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class DockerController {
@RequestMapping("/")
public String index() {
return "Hello Docker!";
}
}
FROM openjdk:8 VOLUME /tmp ADD spring-boot-docker-0.0.1-SNAPSHOT.jar app.jar ENTRYPOINT ["java","-Djava.security.egd=file:/dev/urandom","-jar","/app.jar"]
这个 Dockerfile 文件很简单，构建 Jdk 基础环境，添加 Spring Boot Jar 到镜像中，简单解释一下:
FROM：表示使用 JDK8环境为基础镜像，如果镜像不是本地的会从DockerHub进行下载。VOLUME：VOLUME 指向了一个/tmp的目录，由于 Spring Boot 使用内置的Tomcat容器，Tomcat 默认使用
/tmp作为工作目录。这个命令的效果是：在宿主机的/var/lib/docker目录下创建一个临时文件并把它链接到容器中的
/tmp目录。ADD：拷贝文件并且重命名。ENTRYPOINT：为了缩短 Tomcat 的启动时间，添加java.security.egd的系统属性指向/dev/urandom作为 ENTRYPOINT。
2.2 使用Docker部署Spring Boot项目
将项目 spring-boot-docker 拷贝服务器中，进入项目路径下进行打包测试。
# 打包 $ mvn package # 启动 $ java -jar target/spring-boot-docker-0.0.1-SNAPSHOT.jar
看到 Spring Boot 的启动日志后表明环境配置没有问题，接下来我们使用 DockerFile 构建镜像。
$ mvn package docker:build
第一次构建可能有点慢，当看到以下内容的时候表明构建成功：
[root@zsx spring-boot-docker]# mvn package docker:build
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building spring-boot-docker 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:3.0.1:resources (default-resources) @ spring-boot-docker ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.7.0:compile (default-compile) @ spring-boot-docker ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:3.0.1:testResources (default-testResources) @ spring-boot-docker ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/temp/spring-boot-docker/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.7.0:testCompile (default-testCompile) @ spring-boot-docker ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.20.1:test (default-test) @ spring-boot-docker ---
[INFO]
[INFO] --- maven-jar-plugin:3.0.2:jar (default-jar) @ spring-boot-docker ---
[INFO] Building jar: /home/temp/spring-boot-docker/target/spring-boot-docker-0.0.1-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:2.0.0.RELEASE:repackage (default) @ spring-boot-docker ---
[INFO]
[INFO] --- docker-maven-plugin:1.0.0:build (default-cli) @ spring-boot-docker ---
[INFO] Using authentication suppliers: [ConfigFileRegistryAuthSupplier]
[INFO] Copying /home/temp/spring-boot-docker/target/spring-boot-docker-0.0.1-SNAPSHOT.jar -> /home/temp/spring-boot-docker/target/docker/spring-boot-docker-0.0.1-SNAPSHOT.jar
[INFO] Copying src/main/docker/Dockerfile -> /home/temp/spring-boot-docker/target/docker/Dockerfile
[INFO] Building image springboot/spring-boot-docker
Step 1/4 : FROM openjdk:8
---> b273004037cc
Step 2/4 : VOLUME /tmp
---> Using cache
---> 1ddce8ad30a4
Step 3/4 : ADD spring-boot-docker-0.0.1-SNAPSHOT.jar app.jar
---> 731e8e91b593
Step 4/4 : ENTRYPOINT ["java","-Djava.security.egd=file:/dev/urandom","-jar","/app.jar"]
---> Running in 504bf74d0084
Removing intermediate container 504bf74d0084
---> b3bb84d4545a
ProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}
Successfully built b3bb84d4545a
Successfully tagged springboot/spring-boot-docker:latest
[INFO] Built springboot/spring-boot-docker
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 12.890 s
[INFO] Finished at: 2024-01-23T11:50:16+08:00
[INFO] Final Memory: 30M/97M
[INFO] ------------------------------------------------------------------------
使用docker images命令查看构建好的镜像：
$ [root@zsx spring-boot-docker]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE springboot/spring-boot-docker latest b3bb84d4545a About a minute ago 542MB
springboot/spring-boot-docker 就是我们构建好的镜像，下一步就是运行该镜像
$ [root@zsx spring-boot-docker]# docker run -d -p 8888:8080 -t springboot/spring-boot-docker af51b2369945a77a8b96098618b22191fb2b8a1616897c97688ed8183a7da759
启动完成之后我们使用docker ps查看正在运行的镜像：
[root@zsx spring-boot-docker]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES af51b2369945 springboot/spring-boot-docker "java -Djava.securit…" 48 seconds ago Up 46 seconds 0.0.0.0:8888->8080/tcp, :::8888->8080/tcp youthful_margulis
可以看到我们构建的容器正在在运行，访问浏览器：http://192.168.136.195:8888/，返回
Hello Docker!
说明使用 Docker 部署 Spring Boot 项目成功！
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