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为了不便为SpringBoot利用构建Docker镜像，咱们常常会应用Maven插件来打包镜像。之前始终应用的是第三方插件，有spotify和fabric8出品的两种docker-maven-plugin。最近SpringBoot 2.4.0公布了，官网插件也减少了对Docker的反对，体验了一把发现也很好用，举荐给大家！
第三方插件应用
- 值得注意的是，在咱们应用插件时，须要本人定义镜像构建过程，比方在
pom.xml中应用如下配置，<images>标签下的配置为镜像构建过程的配置；
<build> <plugins> <plugin> <groupId>io.fabric8</groupId> <artifactId>docker-maven-plugin</artifactId> <version>0.33.0</version> <configuration> <!-- Docker 远程管理地址--> <dockerHost>http://192.168.3.101:2375</dockerHost> <!-- Docker 推送镜像仓库地址--> <pushRegistry>http://192.168.3.101:5000</pushRegistry> <images> <image> <!--因为推送到公有镜像仓库，镜像名须要增加仓库地址--> <name>192.168.3.101:5000/mall-tiny/${project.name}:${project.version}</name> <!--定义镜像构建行为--> <build> <!--定义根底镜像--> <from>java:8</from> <args> <JAR_FILE>${project.build.finalName}.jar</JAR_FILE> </args> <!--定义哪些文件拷贝到容器中--> <assembly> <!--定义拷贝到容器的目录--> <targetDir>/</targetDir> <!--只拷贝生成的jar包--> <descriptorRef>artifact</descriptorRef> </assembly> <!--定义容器启动命令--> <entryPoint>["java", "-jar","/${project.build.finalName}.jar"]</entryPoint> <!--定义维护者--> <maintainer>macrozheng</maintainer> </build> </image> </images> </configuration> </plugin> </plugins></build>- 或者先在
Dockerfile文件中定义好镜像构建过程；
# 该镜像须要依赖的根底镜像FROM java:8# 将以后maven目录生成的文件复制到docker容器的/目录下COPY maven /# 申明服务运行在8080端口EXPOSE 8080# 指定docker容器启动时运行jar包ENTRYPOINT ["java", "-jar","/mall-tiny-fabric-0.0.1-SNAPSHOT.jar"]# 指定维护者的名字MAINTAINER macrozheng- 而后在插件中援用
Dockerfile文件，用于构建镜像；
<build> <dockerFileDir>${project.basedir}</dockerFileDir></build>- 其实对于
SpringBoot利用来说，如何从利用Jar包构建Docker镜像，做法根本是差不多的，为什么非要本人定义镜像的构建过程呢？
官网插件应用
SpringBoot官网插件解决了下面的问题，无需本人编写Docker镜像构建过程，间接主动构建，是不是很不便！接下来咱们来体验下它的弱小之处！
- 因为咱们须要把镜像推送到镜像仓库，首先咱们装置好公有镜像仓库
Registry和可视化镜像管理工具docker-registry-ui，具体能够参考《还在手动部署SpringBoot利用？试试这个自动化插件！》。
[root@linux-local ~]# docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES9ffec08467ac joxit/docker-registry-ui:static "/bin/sh -c entrypoi…" 2 hours ago Up 2 hours 0.0.0.0:8280->80/tcp registry-uia809535ee2a2 registry:2 "/entrypoint.sh /etc…" 3 months ago Up 7 hours 0.0.0.0:5000->5000/tcp registry2- 而后咱们须要把利用的版本升级到
SpringBoot 2.4.0，之前的版本Docker反对没有这个欠缺；
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.4.0</version> <relativePath/> <!-- lookup parent from repository --></parent>- 而后批改
pom.xml文件，对官网Maven插件进行配置，次要是对Docker相干性能进行配置；
<plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <image> <!--配置镜像名称--> <name>192.168.3.101:5000/mall-tiny/${project.name}:${project.version}</name> <!--镜像打包实现后主动推送到镜像仓库--> <publish>true</publish> </image> <docker> <!--Docker远程管理地址--> <host>http://192.168.3.101:2375</host> <!--不应用TLS拜访--> <tlsVerify>false</tlsVerify> <!--Docker推送镜像仓库配置--> <publishRegistry> <!--推送镜像仓库用户名--> <username>test</username> <!--推送镜像仓库明码--> <password>test</password> <!--推送镜像仓库地址--> <url>http://192.168.3.101:5000</url> </publishRegistry> </docker> </configuration></plugin>- 如果你应用的是
IDEA的话，间接双击SpringBoot插件的build-image命令即可一键打包并推送到镜像仓库；image.png
- 也能够在命令行应用如下
Maven命令来打包构建镜像；
mvn spring-boot:build-image- 镜像构建过程中会输入如下信息，因为很多依赖会从
Github上下载，网络不好的状况下会下载失败，多试几次就好：
[INFO] > Pulling builder image 'docker.io/paketobuildpacks/builder:base' 100%[INFO] > Pulled builder image 'paketobuildpacks/builder@sha256:9d377230ba8ee74d8619178fd318b1b87a7da1a88bdb198afd14dd7de9e8ea6a'[INFO] > Pulling run image 'docker.io/paketobuildpacks/run:base-cnb' 100%[INFO] > Pulled run image 'paketobuildpacks/run@sha256:33d37fc9ba16e220f071805eaeed881a508ceee5c8909db5710aaed7e97e4fc2'[INFO] > Executing lifecycle version v0.9.3[INFO] > Using build cache volume 'pack-cache-5641f846df6.build'[INFO] [INFO] > Running creator[INFO] [creator] ===> DETECTING[INFO] [creator] 5 of 18 buildpacks participating[INFO] [creator] paketo-buildpacks/ca-certificates 1.0.1[INFO] [creator] paketo-buildpacks/bellsoft-liberica 5.2.1[INFO] [creator] paketo-buildpacks/executable-jar 3.1.3[INFO] [creator] paketo-buildpacks/dist-zip 2.2.2[INFO] [creator] paketo-buildpacks/spring-boot 3.5.0[INFO] [creator] ===> ANALYZING[INFO] [creator] Restoring metadata for "paketo-buildpacks/ca-certificates:helper" from app image[INFO] [creator] Restoring metadata for "paketo-buildpacks/bellsoft-liberica:helper" from app image[INFO] [creator] Restoring metadata for "paketo-buildpacks/bellsoft-liberica:java-security-properties" from app image[INFO] [creator] Restoring metadata for "paketo-buildpacks/bellsoft-liberica:jre" from app image[INFO] [creator] Restoring metadata for "paketo-buildpacks/bellsoft-liberica:jvmkill" from app image[INFO] [creator] Restoring metadata for "paketo-buildpacks/executable-jar:class-path" from app image[INFO] [creator] Restoring metadata for "paketo-buildpacks/spring-boot:helper" from app image[INFO] [creator] Restoring metadata for "paketo-buildpacks/spring-boot:spring-cloud-bindings" from app image[INFO] [creator] Restoring metadata for "paketo-buildpacks/spring-boot:web-application-type" from app image[INFO] [creator] ===> RESTORING[INFO] [creator] ===> BUILDING[INFO] [creator] [INFO] [creator] Paketo CA Certificates Buildpack 1.0.1[INFO] [creator] https://github.com/paketo-buildpacks/ca-certificates[INFO] [creator] Launch Helper: Reusing cached layer[INFO] [creator] [INFO] [creator] Paketo BellSoft Liberica Buildpack 5.2.1[INFO] [creator] https://github.com/paketo-buildpacks/bellsoft-liberica[INFO] [creator] Build Configuration:[INFO] [creator] $BP_JVM_VERSION 8.* the Java version[INFO] [creator] Launch Configuration:[INFO] [creator] $BPL_JVM_HEAD_ROOM 0 the headroom in memory calculation[INFO] [creator] $BPL_JVM_LOADED_CLASS_COUNT 35% of classes the number of loaded classes in memory calculation[INFO] [creator] $BPL_JVM_THREAD_COUNT 250 the number of threads in memory calculation[INFO] [creator] $JAVA_TOOL_OPTIONS the JVM launch flags[INFO] [creator] BellSoft Liberica JRE 8.0.275: Reusing cached layer[INFO] [creator] Launch Helper: Reusing cached layer[INFO] [creator] JVMKill Agent 1.16.0: Reusing cached layer[INFO] [creator] Java Security Properties: Reusing cached layer[INFO] [creator] [INFO] [creator] Paketo Executable JAR Buildpack 3.1.3[INFO] [creator] https://github.com/paketo-buildpacks/executable-jar[INFO] [creator] Process types:[INFO] [creator] executable-jar: java org.springframework.boot.loader.JarLauncher[INFO] [creator] task: java org.springframework.boot.loader.JarLauncher[INFO] [creator] web: java org.springframework.boot.loader.JarLauncher[INFO] [creator] [INFO] [creator] Paketo Spring Boot Buildpack 3.5.0[INFO] [creator] https://github.com/paketo-buildpacks/spring-boot[INFO] [creator] Creating slices from layers index[INFO] [creator] dependencies[INFO] [creator] spring-boot-loader[INFO] [creator] snapshot-dependencies[INFO] [creator] application[INFO] [creator] Launch Helper: Reusing cached layer[INFO] [creator] Web Application Type: Contributing to layer[INFO] [creator] Servlet web application detected[INFO] [creator] Writing env.launch/BPL_JVM_THREAD_COUNT.default[INFO] [creator] Spring Cloud Bindings 1.7.0: Reusing cached layer[INFO] [creator] 4 application slices[INFO] [creator] Image labels:[INFO] [creator] org.opencontainers.image.title[INFO] [creator] org.opencontainers.image.version[INFO] [creator] org.springframework.boot.spring-configuration-metadata.json[INFO] [creator] org.springframework.boot.version[INFO] [creator] ===> EXPORTING[INFO] [creator] Reusing layer 'paketo-buildpacks/ca-certificates:helper'[INFO] [creator] Reusing layer 'paketo-buildpacks/bellsoft-liberica:helper'[INFO] [creator] Reusing layer 'paketo-buildpacks/bellsoft-liberica:java-security-properties'[INFO] [creator] Reusing layer 'paketo-buildpacks/bellsoft-liberica:jre'[INFO] [creator] Reusing layer 'paketo-buildpacks/bellsoft-liberica:jvmkill'[INFO] [creator] Reusing layer 'paketo-buildpacks/executable-jar:class-path'[INFO] [creator] Reusing layer 'paketo-buildpacks/spring-boot:helper'[INFO] [creator] Reusing layer 'paketo-buildpacks/spring-boot:spring-cloud-bindings'[INFO] [creator] Reusing layer 'paketo-buildpacks/spring-boot:web-application-type'[INFO] [creator] Reusing 4/5 app layer(s)[INFO] [creator] Adding 1/5 app layer(s)[INFO] [creator] Reusing layer 'launcher'[INFO] [creator] Reusing layer 'config'[INFO] [creator] Reusing layer 'process-types'[INFO] [creator] Adding label 'io.buildpacks.lifecycle.metadata'[INFO] [creator] Adding label 'io.buildpacks.build.metadata'[INFO] [creator] Adding label 'io.buildpacks.project.metadata'[INFO] [creator] Adding label 'org.opencontainers.image.title'[INFO] [creator] Adding label 'org.opencontainers.image.version'[INFO] [creator] Adding label 'org.springframework.boot.spring-configuration-metadata.json'[INFO] [creator] Adding label 'org.springframework.boot.version'[INFO] [creator] Setting default process type 'web'[INFO] [creator] *** Images (d5e1771dac7b):[INFO] [creator] 192.168.3.101:5000/mall-tiny/mall-tiny-docker-plugin:0.0.1-SNAPSHOT[INFO] [INFO] Successfully built image '192.168.3.101:5000/mall-tiny/mall-tiny-docker-plugin:0.0.1-SNAPSHOT'[INFO] [INFO] > Pushed image '192.168.3.101:5000/mall-tiny/mall-tiny-docker-plugin:0.0.1-SNAPSHOT'[INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 01:06 min[INFO] Finished at: 2020-11-27T15:07:46+08:00[INFO] Final Memory: 37M/359M[INFO] ------------------------------------------------------------------------- 镜像构建胜利后，能够从镜像仓库查看到咱们的镜像：
[root@linux-local ~]# docker imagesREPOSITORY TAG IMAGE ID CREATED SIZEpaketobuildpacks/run base-cnb a717358311fc 9 days ago 87.2MBjava 8 d23bdf5b1b1b 3 years ago 643MB192.168.3.101:5000/mall-tiny/mall-tiny-docker-plugin 0.0.1-SNAPSHOT d5e1771dac7b 40 years ago 244MBpack.local/builder/fewqajyqsc latest f15fad05a5ba 40 years ago 558MBpack.local/builder/kirivtcqtu latest f15fad05a5ba 40 years ago 558MBpaketobuildpacks/builder base 511452064e06 40 years ago 558MB- 咱们能够从
Docker Registry UI中查看镜像仓库中的镜像，拜访地址：http://192.168.3.101:8280/ - 接着应用如下命令启动咱们的
SpringBoot利用：
docker run -p 8080:8080 --name mall-tiny-docker-plugin \--link mysql:db \-v /etc/localtime:/etc/localtime \-v /mydata/app/mall-tiny-docker-plugin/logs:/var/logs \-d 192.168.3.101:5000/mall-tiny/mall-tiny-docker-plugin:0.0.1-SNAPSHOT启动胜利后，能够胜利拜访到
SpringBoot利用的
Swagger页面，拜访地址：
http://192.168.3.101:8080/swagger-ui.html
总结
SpringBoot官网Maven插件防止了编写Docker镜像构建过程，同时充分利用了SpringBoot 2.3当前的Jar分层技术，但对于须要自定义构建镜像的场景造成了肯定的麻烦。
作者：码不动
链接：https://www.jianshu.com/p/22b...
作者：波波烤鸭
起源：https://blog.csdn.net/qq_3852...