Dockerfile構(gòu)建Springboot鏡像

文章目錄

• Dockerfile構(gòu)建Springboot鏡像
• • 簡介
  • 實(shí)例演示
  • • 前期準(zhǔn)備
    • • Docker環(huán)境
      • Springboot項(xiàng)目
      • Dockerfile文件
    • Windows
    • • 要求
      • 構(gòu)建鏡像
      • 啟動(dòng)測試
    • Linux
    • • 要求
      • 構(gòu)建鏡像
      • 啟動(dòng)測試

簡介

容器技術(shù)大流行的時(shí)代，也是docker大流行的時(shí)代。

此文章以一個(gè)簡單的實(shí)例為基礎(chǔ)，幫助大家學(xué)習(xí)和了解：如何使用Dockerfile指令構(gòu)建一個(gè)Springboot的Java項(xiàng)目鏡像。

提示：實(shí)例非常簡單，旨在幫助大家了解基礎(chǔ)知識(shí)，本文的知識(shí)在實(shí)際工作中肯定是不夠用的，還需要自行根據(jù)實(shí)際情況去學(xué)習(xí)，感謝您的閱讀。

實(shí)例演示

• 具體操作介紹了Windows和Linux兩種方式。

前期準(zhǔn)備

Docker環(huán)境

• Windows請安裝Docker Desktop：https://docs.docker.com/desktop/install/windows-install/

• Linux請安裝Docker：https://docs.docker.com/desktop/install/linux-install/

Springboot項(xiàng)目

• 源碼：learn/java/docker-springboot at main · DingDangDog/learn (github.com)

• Jar包下載地址：docker-springboot-1.0.jar.zip

• Controller代碼示例：

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

• 文件名必須為Dockerfile，無拓展名！！！請放在jar包同級(jí)目錄下。

# 基礎(chǔ)鏡像
FROM openjdk:8-jdk
# 作者聲明，原為MAINTAINER，變更為LABEL
# MAINTAINER DingDangDog
LABEL author="DingDangDog"
# 容器卷設(shè)置
VOLUME /tmp
# 向基礎(chǔ)鏡像內(nèi)添加文件，并重命名為`docker_boot.jar`
add docker-springboot-1.0.jar docker_boot.jar
# 執(zhí)行前置腳本。據(jù)說是修改文件時(shí)間？不太明白具體作用，望有大佬指點(diǎn)迷津！
RUN bash -c 'touch /docker_boot.jar'
# 最終執(zhí)行腳本
ENTRYPOINT ["java", "-jar", "/docker_boot.jar"]
# 暴露端口
EXPOSE 10240

指令解析請參考文章：Dockerfile基礎(chǔ)一文通

Windows

要求

1. 前期準(zhǔn)備

2. Windows可以正常啟動(dòng)Docker服務(wù)：

如下圖，運(yùn)行狀態(tài)綠色為正在運(yùn)行
[外鏈圖片轉(zhuǎn)存失敗,源站可能有防盜鏈機(jī)制,建議將圖片保存下來直接上傳(img-kYndCTFA-1670767109761)(https://github.com/DingDangDog/ddd-document/blob/main/docker/images/image-20221004122548749.png?raw=true)]

構(gòu)建鏡像

• 在jar包所在文件夾下打開cmd命令行窗口，運(yùn)行構(gòu)建命令：

  docker build -t docker_boot:1.0 .

  命令解析：

  • docker build：構(gòu)建鏡像
  • -t docker_boot:1.0 ：-t=--tag，指定鏡像名稱為docker_boot，版本為1.0
  • . ：指定Dockerfile文件在當(dāng)前文件夾下

• 構(gòu)建成功日志如下：

  [+] 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                                                                 0.0sUse 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them

• 查看鏡像

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啟動(dòng)測試

1. 啟動(dòng)容器

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2. 調(diào)用測試

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3. 查看本地文件：

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Linux

要求

• 前期準(zhǔn)備

構(gòu)建鏡像

• 在jar包所在文件夾下運(yùn)行構(gòu)建命令：

  docker build -t docker_boot:1.0 .

  解析：

  • docker build：構(gòu)建鏡像

  • -t docker_boot:1.0 ：-t=--tag，指定鏡像名稱為docker_boot，版本為1.0

  • . ：指定Dockerfile文件在當(dāng)前文件夾下

• 構(gòu)建成功日志：

  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

• 查看鏡像docker images

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啟動(dòng)測試

1. 啟動(dòng)容器

   docker run -v /var/local/docker/docker-boot-test/tmp:/tmp -p 10240:10240 -d --name docker_boot_test docker_boot:1.0

2. 調(diào)用測試

   curl http://localhost:10240/say/hello?name=ddd
   # Hello ddd !