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Construyendo Imagenes Docker con Spring Boot Build Image

spring-boot build packages, una forma rápida de crear tus imágenes docker sin Dockerfile

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Henry Martinez
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Construyendo Imagenes Docker con Spring Boot Build Image

Table of contents

Seguramente hayan escuchado de Dockerfile para construir imágenes Docker, pero hoy me gustaría mostrarles una forma rápida de crear imágenes Docker para aplicaciones creadas con Spring Boot con solo ejecutar 1 comando.

Para esto tenemos un comando que nos proporciona el plugin spring-boot-maven-plugin, también usado para construir los archivos jar de nuestras aplicaciones spring boot.

Entorno

  • maven
  • docker
  • mac book pro.
  • java 11

Construyendo la Imagen Docker

Lo primero que tenemos que hacer es ir a la terminal y posicionarnos en la carpeta donde se encuentra nuestro archivo pom.xml, una vez estemos ahí ejecutamos el comando

mvn spring-boot:build-image

Deberíamos ver un resultado similar a este

[INFO]     [creator]     Paketo Executable JAR Buildpack 5.2.1
[INFO]     [creator]       https://github.com/paketo-buildpacks/executable-jar
[INFO]     [creator]       Class Path: Contributing to layer
[INFO]     [creator]         Writing env/CLASSPATH.delim
[INFO]     [creator]         Writing env/CLASSPATH.prepend
[INFO]     [creator]       Process types:
[INFO]     [creator]         executable-jar: java org.springframework.boot.loader.JarLauncher (direct)
[INFO]     [creator]         task:           java org.springframework.boot.loader.JarLauncher (direct)
[INFO]     [creator]         web:            java org.springframework.boot.loader.JarLauncher (direct)
[INFO]     [creator]     
[INFO]     [creator]     Paketo Spring Boot Buildpack 4.6.0
[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: Contributing to layer
[INFO]     [creator]         Creating /layers/paketo-buildpacks_spring-boot/helper/exec.d/spring-cloud-bindings
[INFO]     [creator]       Spring Cloud Bindings 1.8.0: Contributing to layer
[INFO]     [creator]         Downloading from https://repo.spring.io/release/org/springframework/cloud/spring-cloud-bindings/1.8.0/spring-cloud-bindings-1.8.0.jar
[INFO]     [creator]         Verifying checksum
[INFO]     [creator]         Copying to /layers/paketo-buildpacks_spring-boot/spring-cloud-bindings
[INFO]     [creator]       Web Application Type: Contributing to layer
[INFO]     [creator]         Reactive web application detected
[INFO]     [creator]         Writing env.launch/BPL_JVM_THREAD_COUNT.default
[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.version
[INFO]     [creator]     ===> EXPORTING
[INFO]     [creator]     Adding layer 'paketo-buildpacks/ca-certificates:helper'
[INFO]     [creator]     Adding layer 'paketo-buildpacks/bellsoft-liberica:helper'
[INFO]     [creator]     Adding layer 'paketo-buildpacks/bellsoft-liberica:java-security-properties'
[INFO]     [creator]     Adding layer 'paketo-buildpacks/bellsoft-liberica:jre'
[INFO]     [creator]     Adding layer 'paketo-buildpacks/executable-jar:classpath'
[INFO]     [creator]     Adding layer 'paketo-buildpacks/spring-boot:helper'
[INFO]     [creator]     Adding layer 'paketo-buildpacks/spring-boot:spring-cloud-bindings'
[INFO]     [creator]     Adding layer 'paketo-buildpacks/spring-boot:web-application-type'
[INFO]     [creator]     Adding 5/5 app layer(s)
[INFO]     [creator]     Adding layer 'launcher'
[INFO]     [creator]     Adding layer 'config'
[INFO]     [creator]     Adding 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.version'
[INFO]     [creator]     Setting default process type 'web'
[INFO]     [creator]     Saving docker.io/library/lab-1:latest...
[INFO]     [creator]     *** Images (019302746a92):
[INFO]     [creator]           docker.io/library/lab-1:latest
[INFO] 
[INFO] Successfully built image 'docker.io/library/lab-1:latest'
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  19.660 s
[INFO] Finished at: 2021-09-13T08:14:17-05:00
[INFO] ------------------------------------------------------------------------

Finalmente verificamos la imagen creada con el siguiente comando docker images

Podemos ver la imagen recién creada

lab-1                                    latest                  019302746a92   41 years ago    263MB
paketobuildpacks/builder                 base                    33f61a7d9dc3   41 years ago    779MB
hello-lab1                               1.0.0-SNAPSHOT          5ca785c91f5d   41 years ago    263MB
Dockerdocker imagesSpringboot