关于java:还用第三方Docker插件SpringBoot官方插件真香

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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 ps
CONTAINER ID        IMAGE                                                                COMMAND                  CREATED             STATUS              PORTS                                            NAMES
9ffec08467ac        joxit/docker-registry-ui:static                                      "/bin/sh -c entrypoi…"   2 hours ago         Up 2 hours          0.0.0.0:8280->80/tcp                             registry-ui
a809535ee2a2        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 images
REPOSITORY                                            TAG                 IMAGE ID            CREATED             SIZE
paketobuildpacks/run                                  base-cnb            a717358311fc        9 days ago          87.2MB
java                                                  8                   d23bdf5b1b1b        3 years ago         643MB
192.168.3.101:5000/mall-tiny/mall-tiny-docker-plugin   0.0.1-SNAPSHOT      d5e1771dac7b        40 years ago        244MB
pack.local/builder/fewqajyqsc                         latest              f15fad05a5ba        40 years ago        558MB
pack.local/builder/kirivtcqtu                         latest              f15fad05a5ba        40 years ago        558MB
paketobuildpacks/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…

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发表至： java
2021-01-13
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