使用docker部署SpringBoot应用

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本文详细介绍如何使用Docker和docker-compose部署Spring Boot应用，包括pom.xml文件、Dockerfile编写、镜像构建、容器编排流程。

项目环境

  • Spring Boot 2.3.0.RELEASE
  • Java 8

pom.xml

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<?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>2.3.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>springboot-dockerfile-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-dockerfile-demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </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>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
                  <configuration>
                    <layers>
                        <enabled>true</enabled>
                    </layers>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

Controller

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package org.example.springbootdockerfiledemo.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {

    @RequestMapping("/")
    public String index() {
        return "Hello World!";
    }

}

dockerfile

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FROM eclipse-temurin:8-jdk AS builder
WORKDIR app
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
RUN java -Djarmode=layertools -jar app.jar extract

FROM eclipse-temurin:8-jre
WORKDIR app
COPY --from=builder app/dependencies/ ./
COPY --from=builder app/spring-boot-loader/ ./
COPY --from=builder app/snapshot-dependencies/ ./
COPY --from=builder app/application/ ./

ENV TZ=Asia/Shanghai
VOLUME ["/tmp", "/app/log"]
EXPOSE 8080

ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]

构建镜像

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mvn clean install -Dmaven.test.skip=true
docker build -t springboot-dockerfile-demo:latest .

编写 docker-compose.yml 文件

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version: '3'

services:
  springboot-dockerfile-demo:
    container_name: springboot-dockerfile-demo
    image: springboot-dockerfile-demo:latest
    restart: always
    ports:
      - "8080:8080"
    environment:
      TZ: Asia/Shanghai
    volumes:
      - "./log:/app/log" # 日志目录

启动容器

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docker compose up -d

运行后查看启动容器的情况

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docker ps
docker compose logs

测试

浏览器访问 http://localhost:8080