2022-12-11
班门弄斧
00
请注意,本文编写于 582 天前,最后修改于 146 天前,其中某些信息可能已经过时。

目录

简介
前期准备
Docker环境
Springboot项目
Dockerfile文件
实例操作
Windows
要求
构建镜像
启动测试
Linux
要求
构建镜像
启动测试

简介

容器技术大流行的时代,也是docker大流行的时代。

此文章以一个简单的实例为基础,帮助大家学习和了解:如何使用Dockerfile指令构建一个Springboot的Java项目镜像。

提示:实例非常简单,旨在帮助大家了解基础知识,本文的知识在实际工作中肯定是不够用的,还需要自行根据实际情况去学习,感谢您的阅读。

前期准备

Docker环境

Springboot项目

java
package io.github.dingdangdog.controller; import io.github.dingdangdog.utils.FileUtilOm; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * say hello * * @author DingDangDog * @since 2022/10/4 11:13 */ @RestController @RequestMapping("/say") public class SayController { @GetMapping("/hello") public String hello(String name) { System.out.println(name); // 保存文件 FileUtilOm.saveFile("/tmp/", name, name); return "Hello " + name + " !"; } }

Dockerfile文件

  • 文件名必须为Dockerfile,无拓展名!!!请放在jar包同级目录下。文件内容如下:
shell
# 基础镜像 FROM openjdk:8-jdk # 作者声明,原为MAINTAINER,变更为LABEL # MAINTAINER DingDangDog LABEL author="DingDangDog" # 容器卷设置 VOLUME /tmp # 向基础镜像内添加文件,并重命名为`docker_boot.jar` add docker-springboot-1.0.jar docker_boot.jar # 执行前置脚本。据说是修改文件时间?不太明白具体作用,望有大佬指点迷津! RUN bash -c 'touch /docker_boot.jar' # 最终执行脚本 ENTRYPOINT ["java", "-jar", "/docker_boot.jar"] # 暴露端口 EXPOSE 10240

指令解析请参考文章:Dockerfile基础一文通

实例操作

  • 具体操作介绍了WindowsLinux两种方式。

Windows

要求

  • 请阅读上面的前期准备

如下图,运行状态绿色为Docker正在正常运行

docker

构建镜像

  • 在jar包所在文件夹下打开cmd命令行窗口,运行构建命令:

    shell
    docker build -t docker_boot:1.0 .

    命令解析:

    • docker build:构建镜像
    • -t docker_boot:1.0-t=--tag,指定镜像名称为docker_boot,版本为1.0
    • . :指定Dockerfile文件在当前文件夹下
  • 构建成功日志如下:

    shell
    [+] Building 76.3s (9/9) FINISHED => [internal] load build definition from Dockerfile 0.0s => => transferring dockerfile: 254B 0.0s => [internal] load .dockerignore 0.0s => => transferring context: 2B 0.0s => [internal] load metadata for docker.io/library/openjdk:8-jdk 4.6s => [auth] library/openjdk:pull token for registry-1.docker.io 0.0s => [internal] load build context 0.1s => => transferring context: 19.65MB 0.1s => [1/3] FROM docker.io/library/openjdk:8-jdk@sha256:86e863cc57215cfb181bd319736d0baf625fe8f150577f9eb58bd937f5 70.8s => => resolve docker.io/library/openjdk:8-jdk@sha256:86e863cc57215cfb181bd319736d0baf625fe8f150577f9eb58bd937f54 0.0s => => sha256:86e863cc57215cfb181bd319736d0baf625fe8f150577f9eb58bd937f5452cb8 1.04kB / 1.04kB 0.0s => => sha256:3af2ac94130765b73fc8f1b42ffc04f77996ed8210c297fcfa28ca880ff0a217 1.79kB / 1.79kB 0.0s => => sha256:001c52e26ad57e3b25b439ee0052f6692e5c0f2d5d982a00a8819ace5e521452 55.00MB / 55.00MB 24.0s => => sha256:2068746827ec1b043b571e4788693eab7e9b2a95301176512791f8c317a2816a 10.88MB / 10.88MB 13.1s => => sha256:b273004037cc3af245d8e08cfbfa672b93ee7dcb289736c82d0b58936fb71702 7.81kB / 7.81kB 0.0s => => sha256:d9d4b9b6e964657da49910b495173d6c4f0d9bc47b3b44273cf82fd32723d165 5.16MB / 5.16MB 18.0s => => sha256:9daef329d35093868ef75ac8b7c6eb407fa53abbcb3a264c218c2ec7bca716e6 54.58MB / 54.58MB 43.2s => => sha256:d85151f15b6683b98f21c3827ac545188b1849efb14a1049710ebc4692de3dd5 5.42MB / 5.42MB 25.5s => => sha256:52a8c426d30b691c4f7e8c4b438901ddeb82ff80d4540d5bbd49986376d85cc9 210B / 210B 25.3s => => extracting sha256:001c52e26ad57e3b25b439ee0052f6692e5c0f2d5d982a00a8819ace5e521452 1.9s => => sha256:8754a66e005039a091c5ad0319f055be393c7123717b1f6fee8647c338ff3ceb 105.92MB / 105.92MB 68.4s => => extracting sha256:d9d4b9b6e964657da49910b495173d6c4f0d9bc47b3b44273cf82fd32723d165 0.2s => => extracting sha256:2068746827ec1b043b571e4788693eab7e9b2a95301176512791f8c317a2816a 0.2s => => extracting sha256:9daef329d35093868ef75ac8b7c6eb407fa53abbcb3a264c218c2ec7bca716e6 2.1s => => extracting sha256:d85151f15b6683b98f21c3827ac545188b1849efb14a1049710ebc4692de3dd5 0.2s => => extracting sha256:52a8c426d30b691c4f7e8c4b438901ddeb82ff80d4540d5bbd49986376d85cc9 0.0s => => extracting sha256:8754a66e005039a091c5ad0319f055be393c7123717b1f6fee8647c338ff3ceb 2.1s => [2/3] ADD docker-springboot-1.0.jar docker_boot.jar 0.3s => [3/3] RUN bash -c 'touch /docker_boot.jar' 0.4s => exporting to image 0.1s => => exporting layers 0.1s => => writing image sha256:0fcc9c262e90d6a05213ec432924e6835647d233a64ad0747cf7dd406a2a40bd 0.0s => => naming to docker.io/library/docker_boot:1.0 0.0s Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
  • 查看镜像

docker

启动测试

  1. 启动容器

docker

  1. 调用测试

docker

  1. 查看本地文件:

docker

Linux

要求

  • 请阅读上面的 前期准备

构建镜像

  • 在jar包所在文件夹下运行构建命令:

    shell
    docker build -t docker_boot:1.0 .

    解析:

    • docker build:构建镜像

    • -t docker_boot:1.0-t=--tag,指定镜像名称为docker_boot,版本为1.0

    • . :指定Dockerfile文件在当前文件夹下

  • 构建成功日志:

    shell
    Sending build context to Docker daemon 19.65MB Step 1/7 : FROM openjdk:8-jdk 8-jdk: Pulling from library/openjdk 001c52e26ad5: Pull complete d9d4b9b6e964: Pull complete 2068746827ec: Pull complete 9daef329d350: Pull complete d85151f15b66: Pull complete 52a8c426d30b: Pull complete 8754a66e0050: Pull complete Digest: sha256:86e863cc57215cfb181bd319736d0baf625fe8f150577f9eb58bd937f5452cb8 Status: Downloaded newer image for openjdk:8-jdk ---> b273004037cc Step 2/7 : MAINTAINER DingDangDog ---> Running in 6b19d92591a8 Removing intermediate container 6b19d92591a8 ---> 8a491c04d897 Step 3/7 : VOLUME /tmp ---> Running in 696221f7868c Removing intermediate container 696221f7868c ---> ad7eff7b71e1 Step 4/7 : add docker-springboot-1.0.jar docker_boot.jar ---> 77eb15fd7557 Step 5/7 : RUN bash -c 'touch /docker_boot.jar' ---> Running in 0704d4fd8ab2 Removing intermediate container 0704d4fd8ab2 ---> aa9e4ca18365 Step 6/7 : ENTRYPOINT ["java", "-jar", "/docker_boot.jar"] ---> Running in 78ae0e314f8f Removing intermediate container 78ae0e314f8f ---> cb6f8c91f76c Step 7/7 : EXPOSE 10240 ---> Running in 697a7506c8c8 Removing intermediate container 697a7506c8c8 ---> 20bafbe3127b Successfully built 20bafbe3127b Successfully tagged docker_boot:1.0
  • 查看镜像docker images

docker

启动测试

  1. 启动容器

    shell
    docker run -v /var/local/docker/docker-boot-test/tmp:/tmp -p 10240:10240 -d --name docker_boot_test docker_boot:1.0
  2. 调用测试

    shell
    curl http://localhost:10240/say/hello?name=ddd # Hello ddd !
  3. 查看本地文件:

docker

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本文作者:DingDangDog

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